{ "@context": "https://schema.org/", "@type": "Product", "name": "AS Designs MP5 ARC-Fire Lower - Complete Kit | AP5 ZF5 HK SP5 PTR", "description": "AS Designs ARMP5v3 complete kit with ARC-Fire V2 ambidextrous active reset system. CNC billet 7075-T6 aluminum lower, ARC-Fire V2 ambi internals, MP5 hammer, mil-spec FCG, anti-walk pins, Slip Trip V5, and AR grip. Available for AP5, ZF5, HK SP5, and PTR platforms. $749.99.", "image": [ "https://cdn.shopify.com/s/files/1/0646/2282/1621/files/MKE_FS_ARC_mark_stripped__89266.jpg?v=1786467039", "https://cdn.shopify.com/s/files/1/0646/2282/1621/files/as-designs-HK-mp5-super-safety-lower-ap5-zf5-complete-kit_rev2.jpg?v=1786467020", "https://cdn.shopify.com/s/files/1/0646/2282/1621/files/as-designs-mp5k-super-safety-lower-K-size-complete.jpg?v=1786467028", "https://cdn.shopify.com/s/files/1/0646/2282/1621/files/Super_Safety_MP5_Machined_Lower_-_PTR_9C-9CT-9RS_-_Full_Kit.jpg?v=1786467053", "https://cdn.shopify.com/s/files/1/0646/2282/1621/files/AR_MP5-K_Lower_-_PTR_9KT.jpg?v=1786467011" ], "brand": { "@type": "Brand", "name": "AS Designs" }, "manufacturer": { "@type": "Organization", "name": "AS Designs", "address": { "@type": "PostalAddress", "addressCountry": "US" } }, "sku": "ASD-MP5-ARC-COMPLETE", "mpn": "ASD-MP5-ARC-COMPLETE", "material": "7075-T6 Billet Aluminum - Type III Hardcoat Anodized", "color": "Black", "countryOfOrigin": "US", "category": "Firearm Parts > MP5 > Lowers > Complete Kits", "offers": { "@type": "Offer", "url": "https://www.artakedowntool.com/products/as-designs-mp5-arc-fire-lower-complete-kit", "priceCurrency": "USD", "price": "749.99", "priceValidUntil": "2026-12-31", "availability": "https://schema.org/InStock", "itemCondition": "https://schema.org/NewCondition", "shippingDetails": { "@type": "OfferShippingDetails", "shippingRate": { "@type": "MonetaryAmount", "value": "0", "currency": "USD" }, "shippingDestination": { "@type": "DefinedRegion", "addressCountry": "US" }, "deliveryTime": { "@type": "ShippingDeliveryTime", "handlingTime": { "@type": "QuantitativeValue", "minValue": 1, "maxValue": 5, "unitCode": "DAY" }, "transitTime": { "@type": "QuantitativeValue", "minValue": 2, "maxValue": 5, "unitCode": "DAY" } } }, "hasMerchantReturnPolicy": { "@type": "MerchantReturnPolicy", "applicableCountry": "US", "returnPolicyCategory": "https://schema.org/MerchantReturnFiniteReturnWindow", "merchantReturnDays": 30, "returnMethod": "https://schema.org/ReturnByMail", "returnFees": "https://schema.org/FreeReturn" }, "seller": { "@type": "Organization", "name": "The Takedown Tools", "url": "https://www.artakedowntool.com" } }, "additionalProperty": [ { "@type": "PropertyValue", "name": "Lower Material", "value": "7075-T6 Billet Aluminum - CNC machined" }, { "@type": "PropertyValue", "name": "Finish", "value": "Type III Hardcoat Anodized - Black" }, { "@type": "PropertyValue", "name": "Safety System", "value": "AS Designs ARC-Fire V2 - Ambidextrous" }, { "@type": "PropertyValue", "name": "ARC-Fire Config", "value": "Ambi - 0-90-180 standard (other configs available)" }, { "@type": "PropertyValue", "name": "Compatible Hosts", "value": "AP5, ZF5, MAC-5, POF-5, HK SP5, HK SP5K, PTR 9C, PTR 9KT" }, { "@type": "PropertyValue", "name": "Markings", "value": "Laser engraved SAFE - SEMI - ARC" }, { "@type": "PropertyValue", "name": "Kit Contents", "value": "Lower, ARC-Fire V2 kit, MP5 hammer, mil-spec FCG, anti-walk pins, Slip Trip V5, AR grip" }, { "@type": "PropertyValue", "name": "Ejector Lever", "value": "4140 steel, heat treated, oxide coated - custom AS Designs" }, { "@type": "PropertyValue", "name": "Restricted States", "value": "Does not ship to CA, CO, CT, DE, FL, HI, IL, MA, MD, MN, NJ, NV, NY, OR, RI" } ] } { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "What is included in the ARC-Fire complete kit?", "acceptedAnswer": { "@type": "Answer", "text": "The complete kit includes the ARMP5v3 Rev. 2 lower, AS Designs ARC-Fire V2 kit (ambidextrous), AS Designs MP5 hammer, mil-spec FCG (disconnector and springs), anti-walk pins, Slip Trip V5, custom ejector lever assembly, and mil-spec AR grip. Everything needed to install - no additional parts required." } }, { "@type": "Question", "name": "What is the difference between the ARC-Fire and Super Safety MP5 lower?", "acceptedAnswer": { "@type": "Answer", "text": "Both use the same ARMP5v3 Rev. 2 lower - the difference is the active reset mechanism. The Super Safety ($649.99) uses the Hoffman Tactical 3-position cam system. The ARC-Fire V2 ($749.99) uses AS Designs&'; own ARC-Fire V2 ambidextrous system with configurable selector positions (0-90-180, 0-45-90, or 0-45-180). The ARC-Fire V2 is AS Designs&'; flagship trigger system and is priced accordingly." } }, { "@type": "Question", "name": "What ARC-Fire V2 configuration does this ship with?", "acceptedAnswer": { "@type": "Answer", "text": "The standard configuration is ambi 0-90-180. Contact us before ordering if you need a different selector position configuration - 0-45-90 and 0-45-180 ambi configs are available. Non-ambi 0-90-180 is also available." } }, { "@type": "Question", "name": "Which MP5 host guns is this compatible with?", "acceptedAnswer": { "@type": "Answer", "text": "Available in six variants: AP5 / ZF5 / MAC-5 / POF-5 (full size MKE clone), AP5-P / ZF5-K / MAC-5K (MP5-K size), H&K SP5 / SP5-L (full size HK), H&K SP5K / SP5K-PDW (K size HK), PTR 9C / 9CT / 9RS (full size PTR), and PTR 9KT (MP5-K PTR). Does not fit PTR or HK models not listed." } }, { "@type": "Question", "name": "How does the ARC-Fire V2 work?", "acceptedAnswer": { "@type": "Answer", "text": "The ARC-Fire V2 is a 3-position active reset selector. In ARC position, as the bolt carrier cycles it contacts the ARC-Fire mechanism and forces the trigger forward before the bolt returns to battery - enabling rapid successive fire at one round per trigger function. Safe and Semi positions function as normal." } }, { "@type": "Question", "name": "Does this ship faster than ordering from AS Designs directly?", "acceptedAnswer": { "@type": "Answer", "text": "AS Designs lists a 5-7 day lead time for lowers with upgrades on their site. We ship from in-stock inventory - once your order is confirmed, processing and shipping are significantly faster." } }, { "@type": "Question", "name": "Which states does this not ship to?", "acceptedAnswer": { "@type": "Answer", "text": "This product does not ship to California, Colorado, Connecticut, Delaware, Florida, Hawaii, Illinois, Massachusetts, Maryland, Minnesota, New Jersey, Nevada, New York, Oregon, or Rhode Island." } } ] } #pw { font-family: &';DM Sans&';, sans-serif; font-size: 15px; line-height: 1.7; } #pw, #pw * { color: inherit; } #pw p, #pw li, #pw td, #pw div, #pw span { color: #111111 !important; } #pw h1, #pw h2, #pw h3 { color: #111111 !important; } #pw strong { color: #111111 !important; } #pw a { color: #b07a28 !important; text-decoration: none !important; } #pw a:hover { text-decoration: underline !important; } /* namespace: .mp5arc */ #pw .mp5arc-badge { display: inline-block !important; background: #b07a28 !important; color: #000000 !important; font-size: 10px !important; font-weight: 700 !important; letter-spacing: .12em !important; text-transform: uppercase !important; padding: 3px 10px !important; border-radius: 2px !important; margin-bottom: 14px !important; } #pw .mp5arc-intro { font-size: 15.5px !important; color: #111111 !important; margin-bottom: 14px !important; line-height: 1.75 !important; } #pw .mp5arc-h2 { font-size: 17px !important; font-weight: 700 !important; color: #111111 !important; margin: 32px 0 12px !important; padding-bottom: 8px !important; border-bottom: 2px solid #dddddd !important; } #pw .mp5arc-alert { background: #fff8f0 !important; border: 1px solid #e8d8c0 !important; border-left: 3px solid #b07a28 !important; border-radius: 0 6px 6px 0 !important; padding: 14px 18px !important; margin: 0 0 24px !important; font-size: 14px !important; color: #111111 !important; } #pw .mp5arc-alert-label { font-size: 10px !important; font-weight: 700 !important; letter-spacing: .12em !important; text-transform: uppercase !important; color: #b07a28 !important; margin-bottom: 5px !important; } #pw .mp5arc-warning { background: #fff8f8 !important; border: 1px solid #f0d0d0 !important; border-left: 3px solid #cc3333 !important; border-radius: 0 6px 6px 0 !important; padding: 14px 18px !important; margin: 20px 0 !important; font-size: 13.5px !important; color: #111111 !important; } #pw .mp5arc-warning-label { font-size: 10px !important; font-weight: 700 !important; letter-spacing: .12em !important; text-transform: uppercase !important; color: #cc3333 !important; margin-bottom: 5px !important; } #pw .mp5arc-inbox { display: grid !important; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)) !important; gap: 12px !important; margin: 14px 0 24px !important; } #pw .mp5arc-inbox-item { background: #f7f7f7 !important; border: 1px solid #e4e4e4 !important; border-radius: 6px !important; padding: 14px 16px !important; } #pw .mp5arc-inbox-label { font-size: 10px !important; font-weight: 700 !important; letter-spacing: .1em !important; text-transform: uppercase !important; color: #b07a28 !important; margin-bottom: 6px !important; } #pw .mp5arc-inbox-item p { font-size: 13.5px !important; color: #444444 !important; margin: 0 !important; line-height: 1.5 !important; } #pw .mp5arc-features { list-style: none !important; padding: 0 !important; margin: 0 0 20px !important; } #pw .mp5arc-features li { padding: 10px 0 !important; border-bottom: 1px solid #eeeeee !important; font-size: 15px !important; color: #111111 !important; display: flex !important; gap: 10px !important; align-items: flex-start !important; line-height: 1.55 !important; } #pw .mp5arc-features li:last-child { border-bottom: none !important; } #pw .mp5arc-features li::before { content: &';-&'; !important; color: #b07a28 !important; flex-shrink: 0 !important; font-weight: 700 !important; margin-top: 2px !important; } #pw .mp5arc-positions { display: grid !important; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)) !important; gap: 12px !important; margin: 14px 0 24px !important; } #pw .mp5arc-pos { background: #f7f7f7 !important; border: 1px solid #e4e4e4 !important; border-radius: 6px !important; padding: 14px 16px !important; } #pw .mp5arc-pos-label { font-size: 11px !important; font-weight: 700 !important; letter-spacing: .1em !important; text-transform: uppercase !important; color: #b07a28 !important; margin-bottom: 6px !important; } #pw .mp5arc-pos p { font-size: 13.5px !important; color: #444444 !important; margin: 0 !important; line-height: 1.5 !important; } #pw .mp5arc-compat { width: 100% !important; border-collapse: collapse !important; margin: 12px 0 24px !important; font-size: 14px !important; } #pw .mp5arc-compat tr { border-bottom: 1px solid #eeeeee !important; } #pw .mp5arc-compat tr:last-child { border-bottom: none !important; } #pw .mp5arc-compat th { padding: 10px 12px !important; font-size: 11px !important; font-weight: 700 !important; letter-spacing: .08em !important; text-transform: uppercase !important; color: #888888 !important; text-align: left !important; border-bottom: 2px solid #dddddd !important; background: #f7f7f7 !important; } #pw .mp5arc-compat td { padding: 10px 12px !important; color: #111111 !important; vertical-align: top !important; font-size: 14px !important; } #pw .mp5arc-compat tr:nth-child(even) td { background: #f9f9f9 !important; } #pw .mp5arc-specs { width: 100% !important; border-collapse: collapse !important; margin: 12px 0 24px !important; font-size: 14px !important; } #pw .mp5arc-specs tr { border-bottom: 1px solid #eeeeee !important; } #pw .mp5arc-specs tr:last-child { border-bottom: none !important; } #pw .mp5arc-specs td { padding: 10px 12px !important; color: #111111 !important; vertical-align: top !important; } #pw .mp5arc-specs td:first-child { font-weight: 600 !important; width: 40% !important; color: #555555 !important; } #pw .mp5arc-specs tr:nth-child(even) td { background: #f9f9f9 !important; } #pw .mp5arc-restricted { background: #f8f8f8 !important; border: 1px solid #dddddd !important; border-radius: 4px !important; padding: 14px 16px !important; margin: 20px 0 !important; font-size: 13px !important; color: #555555 !important; } #pw .mp5arc-restricted strong { color: #111111 !important; } #pw .mp5arc-faq { margin: 12px 0 0 !important; } #pw .mp5arc-faq-item { border-bottom: 1px solid #eeeeee !important; } #pw .mp5arc-faq-item summary { cursor: pointer !important; list-style: none !important; padding: 14px 0 !important; font-weight: 600 !important; font-size: 14.5px !important; color: #111111 !important; display: flex !important; justify-content: space-between !important; align-items: center !important; gap: 12px !important; } #pw .mp5arc-faq-item summary::-webkit-details-marker { display: none !important; } #pw .mp5arc-faq-item summary::after { content: &';+&'; !important; color: #b07a28 !important; font-size: 18px !important; font-weight: 300 !important; flex-shrink: 0 !important; } #pw .mp5arc-faq-item[open] summary::after { content: &';x;&'; !important; } #pw .mp5arc-faq-answer { padding: 0 0 16px !important; font-size: 14px !important; color: #444444 !important; line-height: 1.7 !important; } #pw .mp5arc-links { list-style: none !important; padding: 0 !important; margin: 12px 0 0 !important; } #pw .mp5arc-links li { padding: 7px 0 !important; border-bottom: 1px solid #eeeeee !important; font-size: 14px !important; } #pw .mp5arc-links li:last-child { border-bottom: none !important; } #pw .mp5arc-disclaimer { margin-top: 28px !important; padding-top: 16px !important; border-top: 1px solid #dddddd !important; font-size: 12.5px !important; color: #888888 !important; line-height: 1.6 !important; } AS Designs A ARMP5v3 Rev. 2 A ARC-Fire V2 A Ambi A Complete Kit A 6 Host Gun Variants The AS Designs MP5 ARC-Fire Lower is the premium active reset lower for the MP5 platform - built on the same ARMP5v3 Rev. 2 billet 7075-T6 aluminum lower as the Super Safety version, paired with AS Designs&'; own ARC-Fire V2 ambidextrous active reset system. The ARC-Fire V2 is AS Designs&'; flagship trigger system, and this complete kit delivers everything needed to run it in your MP5 host gun without permanent modification. Available for six host gun configurations. Select your variant from the dropdown before adding to cart. Want the Super Safety Instead? If you prefer the Hoffman Tactical Super Safety over the ARC-Fire V2, see the AS Designs MP5 Super Safety Lower Complete Kit ($649.99) - same premium lower, Super Safety internals at $100 less. ARC-Fire V2 vs Super Safety - Which Is Right for You ARC-Fire V2 ($749.99) - AS Designs&'; own flagship system. Ambidextrous out of the box, configurable selector positions (0-90-180, 0-45-90, or 0-45-180). The most refined active reset system AS Designs produces. Choose this if you want the best AS Designs has built Super Safety ($649.99) - Hoffman Tactical&';s proven 3-position system. Slightly lower price point, battle-tested across thousands of AR-15 builds, now adapted for the MP5 platform. Choose this if you are already familiar with the Super Safety system What&';s In The Complete Kit ARMP5v3 Lower - Rev. 2 CNC billet 7075-T6 aluminum, Type III hardcoat anodized black. Updated ejector lever mount. Laser engraved SAFE - SEMI - ARC markings. ARC-Fire V2 - Ambi AS Designs ARC-Fire V2 ambidextrous kit. Standard config: 0-90-180. Contact us before ordering for alternate configs. MP5 Hammer AS Designs custom MP5 hammer - designed specifically for this lower and the ARC-Fire active reset system. Mil-Spec FCG Disconnector and springs - complete fire control group components included. Anti-Walk Pins Required for this lower. Anti-walk pins (not anti-rotation) included in every kit. Slip Trip V5 7075-T6 aluminum Slip Trip V5 - the interface between the AR-style lower and your MP5 upper. Installs into the upper. Custom Ejector Lever 4140 steel, heat treated, oxide coated. Includes ejector lever nut, bushing, and 2x 3mm screws. AR Grip Mil-spec AR grip included. Contact us before ordering if you want a specific grip upgrade. How ARC-Fire V2 Works in an MP5 Safe Trigger blocked. No fire. Standard safe position. Semi Standard semi-auto fire. Trigger fires and resets manually as normal. ARC (Active Reset) As the bolt carrier cycles, the ARC-Fire mechanism forces the trigger forward before the bolt returns to battery - enabling the fastest follow-up fire your trigger finger can produce. One round per trigger function. Lower Construction 7075-T6 billet aluminum - the highest-strength aluminum alloy used in firearm construction, CNC machined to tight tolerances Type III hardcoat anodized - mil-spec surface treatment for maximum hardness and corrosion resistance Rev. 2 ejector lever mount - updated design with 4140 steel heat-treated ejector lever, custom bushing, and nut for reliable case ejection Laser engraved markings - SAFE - SEMI - ARC positions clearly marked on the lower AR-15 FCG compatible - accepts standard AR-15 fire control group components and premium aftermarket triggers including Geissele Ambidextrous ARC-Fire V2 - left and right hand operation with configurable selector travel positions Host Gun Compatibility - Select Your Variant Variant Compatible Host Guns Size AP5 / ZF5 / MAC-5 / POF-5 Century Arms AP5, AP5-SD A Zenith ZF5, ZF5RS A MAC-5 A POF-5, POF-5PK Full Size AP5-P / ZF5-K / MAC-5K Century Arms AP5-P A Zenith ZF5-K A MAC-5K MP5-K H&K SP5 / SP5-L Heckler & Koch SP5 A SP5-L Full Size H&K SP5K / SP5K-PDW Heckler & Koch SP5K A SP5K-PDW MP5-K PTR 9C / 9CT / 9RS PTR 9C A PTR 9CT A PTR 9RS Full Size PTR 9KT PTR 9KT MP5-K Important Compatibility Notes Does not fit PTR or H&K models not listed above. If your host gun is not in the table, do not order. Some hand fitment may be required due to tolerance stacking across manufacturers. Use anti-walk pins only - anti-rotation pins are not compatible. Do not use the Atrius Super Selektor - incompatible and may damage the lower. Not compatible with cassette triggers. Specs Lower Material 7075-T6 Billet Aluminum - CNC machined Finish Type III Hardcoat Anodized - Black Active Reset System AS Designs ARC-Fire V2 - Ambidextrous Selector Config 0-90-180 standard - 0-45-90 and 0-45-180 available (contact us) Markings Laser engraved SAFE - SEMI - ARC Ejector Lever 4140 Steel - heat treated, oxide coated Slip Trip V5 - 7075-T6 Aluminum (installs into upper) FCG Mil-spec disconnector and springs - included Pins Anti-walk pins - included (anti-rotation NOT compatible) Grip Mil-spec AR grip - included Design Credit ARMP5v3 designed by s3igu2 - used with approval Manufacturer AS Designs - Active Safety Designs, USA State Restrictions: This product does not ship to California, Colorado, Connecticut, Delaware, Florida, Hawaii, Illinois, Massachusetts, Maryland, Minnesota, New Jersey, Nevada, New York, Oregon, or Rhode Island. Orders placed from restricted states will be cancelled and refunded. Frequently Asked Questions What is included in the ARC-Fire complete kit? The complete kit includes the ARMP5v3 Rev. 2 lower, AS Designs ARC-Fire V2 ambi kit, AS Designs MP5 hammer, mil-spec FCG (disconnector and springs), anti-walk pins, Slip Trip V5, custom ejector lever assembly, and mil-spec AR grip. Everything needed to install - no additional parts required. What is the difference between this and the Super Safety lower? Both use the same ARMP5v3 Rev. 2 lower. The Super Safety ($649.99) uses the Hoffman Tactical 3-position cam system. The ARC-Fire V2 ($749.99) uses AS Designs&'; own ambidextrous system with configurable selector positions. The ARC-Fire V2 is AS Designs&'; flagship and is priced accordingly. What ARC-Fire V2 configuration does this ship with? The standard configuration is ambi 0-90-180. Contact us before ordering if you need a different selector position - 0-45-90 and 0-45-180 ambi configs are available, as is a non-ambi 0-90-180 option. Which MP5 host guns is this compatible with? Available in six variants: AP5 / ZF5 / MAC-5 / POF-5 (full size MKE clone), AP5-P / ZF5-K / MAC-5K (MP5-K size), H&K SP5 / SP5-L (full size HK), H&K SP5K / SP5K-PDW (K size HK), PTR 9C / 9CT / 9RS (full size PTR), and PTR 9KT (MP5-K PTR). Does not fit PTR or HK models not listed. Does this require permanent modification to my MP5? No permanent modification is required. Install the Slip Trip V5 into your existing MP5 upper and pin the new lower on. Some hand fitment may be required due to tolerance stacking across different host gun manufacturers. Can I use anti-rotation pins with this lower? No. Use anti-walk pins only - anti-rotation pins are not compatible. Anti-walk pins are included in the complete kit. Which states does this not ship to? This product does not ship to California, Colorado, Connecticut, Delaware, Florida, Hawaii, Illinois, Massachusetts, Maryland, Minnesota, New Jersey, Nevada, New York, Oregon, or Rhode Island. Related Products & Resources AS Designs MP5 Super Safety Lower - Complete Kit ($649.99) All Super Safety & Active Reset Products FRT vs Super Safety - Full Comparison Are FRT Triggers Legal? - State-by-State Guide Best FRT Triggers for AR-15 - 2026 Buyer&';s Guide Some hand fitment may be required due to tolerance stacking across different MP5 host gun manufacturers. AS Designs recommends installation by a qualified gunsmith. It is the buyer&';s responsibility to verify compatibility with their specific host gun and to comply with all applicable local, state, and federal laws. This product does not ship to CA, CO, CT, DE, FL, HI, IL, MA, MD, MN, NJ, NV, NY, OR, or RI. Design credit: ARMP5v3 by s3igu2 - used with approval. Original ARMP5 concept by UberPoor.