REMINGTON AP4 MIL-SPEC COLLAPSIBLE CARBINE STOCK FOR AR-15 The AP4 Mil-Spec Collapsible Carbine Stock (Black) is a proven, battle-tested design engineered for AR-15 carbines that demand reliability and simplicity. Built from high-strength, impact-resistant polymer, this stock delivers a solid shoulder weld, smooth adjustment, and dependable performance in harsh conditions. Its mil-spec diameter ensures perfect fitment on standard carbine receiver extensions, making it an ideal replacement for worn OEM stocks or a dependable choice for new builds. With its streamlined M4 profile, reinforced adjustment latch, and textured buttplate, the AP4 stock provides excel Mfg: Remington