Battle Arms Development Enhanced Complete AR Lower Parts Kit Black Phosphate. The AR-15 Cast Enhanced Bolt Catch is 8620 heat treated cast steel with a manganese phosphate black finish. With this upgrade you have a versatile modular design enhanced control surfaces lightweight engineering and better ergonomics. Lightweight but Robust Design 0.39oz Compatible with Norgon Ambi-Catch Without Interference Raised "T-Shaped" Heel Provides Positive and Distinctive Control Surface for Bolt Lock Back Bold Horizontal and Diagonal Serrations Provides Positive Purchase Enhanced Single Sided Safety Selector (BAD-E4S-IC) for the AR15 Style Rifles. Based on our famous BAD-ASS Ambidextrous Safety Selector with distinctive and diagonal serrations. Single Side Safety Selector (0-90 SEMI AUTO) Fit all Mil-Spec Dimensioned AR-15 Lower Receiver Black Phosphate Finish Investment Cast 8620 Heat Treated Steel made in specialized factories Enhanced Magazine Catch - BAD-EMC-IC Process Investment Cast (Same Process as Mil-Spec) Material 8620 Heat Treated Steel Finish Black Phosphate Finish Construction One Piece Engineering (Not Two-Piece) Design Lightweight Fluted Design Compatibility Compatible with Mil-Spec Magazine Release Button BAD-EMR BAD-EMMR etc. Length Shorter Threaded Pin to Reduce Installed Magazine Button Profile of Solid Face Magazine Release Buttons Weight 0.25 oz (v.s. 0.32 oz Mil-Spec) BAD-EMR (Enhanced Magazine Release) for the AR15/AR10. Precision CNC Machined for billet 7075-T6 Aluminum (not 6061) in an anodized BLACK finish the BAD-EMR features an unique fully solid "V" shaped button face with horizontal serrations (no through hole). The concave V-Groove button face offers excellent ergonomic feel and self-centers the index finger as pressure is applied. The horizontal parallel serrations helps slippage in the vertical orientation while minimizing drag in the horizontal direction for finger retraction. The BAD-EMR also features a lightweight skeletonized back to offset the weight gained from the fully solid button face and slightly increased height to equal the weight of the standard mil-spec magazine release (approximately 0.002 lbs). BAD-EMR is compatible with all lower receivers that accepts mil-spec magazine release buttons. BAD-ATG Adjustable Tactical Grip easily adjusts with the included hex key to each of the three most popular industry proven angles (17 25 & 33 degrees) using the Patent Pending adjustable angle mechanism. The textured finger grooves and ribbed back-strap optimize comfort and provides positive control. Dimpled air gaps help keep hand dry while offering firm grip texture. Only 3.0oz complete with screw and washer BAD-EPS Takedown and Pivot Pins AR15 / M16 / M4 Compatible - Fits all AR15/M16/M4 lower receivers with mil-spec .250in diameter front pivot and rear takedown pin holes. Patent Pending Pivot Pin & Takedown Pin Head Designs - Greatly improved gripping surface and pull strength without the use of oversize heads. Low Profile Pin Heads - Low drag and never in the way. Lower profile than mil-spec pin heads. Ambidextrous Safety Compatible - The Enhanced Takedown Pin (BAD-ETP) head design does not obstruct the use of the right side ambidextrous safety selector lever. Extended Pin Tips (+0.030in over mil-spec) - Added tip length noticeably aids in starting/pushing the pins out from the left side of the receiver without undue protrusion. Bullet Tip Guide - Cone shaped recess at both pin tips prevent accidental bullet or tool slip and reduced the chance of scratching/damaging of the receiver. Patent Pending EZ Guide Channel & Magnetic Assist Install - Easy hassle free magnet assisted installation of the EPP (Enhanced Pivot Pin). No more lost detents and springs. Each BAD-EPS comes with (1) BAD-ETP (1) BAD-EPP (2) KNS hardened stainless steel detents (2) 17-7 nickel plated stainless steel pin springs and (1) high-strength neodymium magnet for hassle free magnet assisted installation of the Enhanced Pivot Pin (BAD-EPP). Mil-Spec Trigger And Hammer Nickel Teflon Semi Auto Hammer and Trigger Disconnector Disconnector Spring Hammer Spring Trigger Spring Springs and Detents Qty 2 Takedown / Pivot Pin Springs Qty 2 Takedown / Pivot Pin Detents Qty 1 Bolt Catch Detent Qty 1 Bolt Catch Spring Qty 1 Trigger Guard Qty 1 Trigger Guard Roll Pin Qty 2 Hammer / Trigger Pins Mil Spec Qty 1 Safety Selector Detent Qty 1 Safety Selector Detent Spring Qty 1 Magazine Catch Spring Qty 1 Buffer Retainer Detent Qty 1 Buffer Retainer Detent Spring Specifications for Battle Arms Development Enhanced Complete AR Lower Parts Kit: Manufacturer: Battle Arms Development Color: Black Finish: Black Phosphate Finish Fabric/Material: 8620 Heat Treated Cast Steel Gun Model: M16 Weight: 0.39 oz Condition: New Package Contents: Battle Arms Development Enhanced Complete AR Lower Parts Kit Battle Arms Development BAD-LPK-PKX: Enhanced Complete AR Lower Parts Kit Black Phosphate