Dead Foot Arms 5.25" Pistol Kits are compact, MCS-driven systems designed for builds where minimal length and reliable cycling are critical. These kits include a shortened bolt carrier group, receiver extension system, and the essential components for achieving fire-while-folded performance in a handgun-length AR platform. Ideal for PDW-style pistols chambered in 9mm or rifle calibers using DFA’s proprietary cycle system.