Elevate Your Big-Bore Stribog Performance. Are you looking to enhance the ergonomics and modularity of your .45 ACP (SP45) or 10mm (SP10) Stribog? The KDG SRX 3.25 Rail Extension is a meticulously engineered upgrade designed specifically for the larger-caliber Stribog platforms. This extension provides a more comfortable grip, increased mounting real estate, and the robust construction KDG is known for. Why Choose the SRX 3.25 for .45 ACP / 10mm? Optimized for Big Bore: While previous extensions were limited to 9mm models, this version is precision-machined to fit the unique receiver geometry of the Stribog SP45 and SP10 series. 3.25 Inches of Extra Real Estate: The "3.25" design isn't just about length-it's about functionality. That extra 1/4 inch over our older extensions allows for a second full M-LOK slot on the bottom rail, giving you the perfect position for grips, hand-stops, or bipods. Suppressor Ready: With a generous 1.72-inch internal diameter, the SRX 3.25 is built to shroud most common .45 and 10mm suppressors. The strategic venting ensures your hand stays cool even during the high-pressure gas discharge of larger calibers. Rock-Solid Mounting: Utilizing KDG's MkII unified hardware system, the rail is mechanically fastened at multiple points to the upper receiver. This creates a monolithic-style feel that won't shift or lose zero with rail-mounted lasers or lights. Features & Specifications: Compatibility: Grand Power Stribog SP45 (45ACP) and SP10 (10mm) models with M-LOK receivers. Added Length: 3.25 inches (Overall extension length 6.5 inches). Mounting Interface: M-LOK slots at the 3, 6, and 9 o'clock positions; Continuous T-marked Picatinny rail on top. Internal Diameter: 1.72" (Compatible with most large-bore suppressors). Material: 6061-T6 Aircraft Grade Aluminum. Finish: Durable Type III Hardcoat Anodized Or Cerakote (Available in Black and FDE). Weight: Rail: 4.2 oz | Overall (with hardware): 6.2 oz. SKU: Black: STR5-MK1-030 SKU: FDE: STR5-MK1-130 Included in the Box: (1) SRX 3.25 Receiver Extension (1) Bridge Insert (2) Bridge Clamps (1) Unified Hardware Kit (T20/T25 screws) KDG Sticker