M k.18 Mod 0/1 CQBR
M k.18 Mod 0/1 CQBR Caliber: 5.56 × 45mm M855 / M k.262 The Close Quarters Battle Receiver (CQBR) is a replaceable upper receiver for the M4A1 carbine. Its purpose is to provide naval special forces with a short-length and light-weight close combat weapon that can be used with the SOPMOD M4 tactical attachment. Completely versatile, minimizing the workload of logistical maintenance. This short-barreled M4A1 conversion kit was designed by the U.S. Naval Surface Warfare Center in Crane, Indiana . Although the length of the M4A1 is already shorter than the standard M16 series , it is not suitable for all missions. Such as VIP protection, urban combat or indoor close combat (CQB) and other situations. The CQBR uses the modular function of the M16 series to allow users to adapt to the nee...