Magpul

-Replacement for AR15/AR10 pistol-grip*-Removable and replaceable front and rear straps for a custom fit over multiple hand sizes-Improved ergonomics and positive anti-slip texture on both sides and rear back-strap-Removable inner core holds a reusable 1/2 fl. oz. lubrication bottle (oil not included)-Custom waterproof storage of batteries (AA/AAA or CR123A) or spare bolt/firing pin (AR15/M4) isavailable with optional Storage Cores-Each kit includes three backstrap sizes (S,M,L), two frontstraps (A1 and A2 style), lubrication bottle core,and dual-drive mounting screw*Note: This TYPE 1 Kit fits all AR15/M4's as well as many 7.62x51 variants such as the Aero Precision M5 308, CMMG MK3, CORE Rifle Systems CORE30, HK 417/MR762A1, LWRCI REPR, Mega Arms MATEN, POF P-308, Ruger SR-762, and SIG716.In general, the TYPE 1 Kit will fit most all 7.62x51 AR lower receivers but there may or may not be a gap between the backstrap's 'beavertail' and the receiver. This gap is purely aesthetic and will not affect function.