Tokyo Marui CQBR Block 1 GBB RifleA new era of M4 Shorty that evolves flexibly A CQBR replaces the upper receiver with each barrel to make it a short barrel of 10. 3 inches in order to make the M4 compatible with close quarters combat (CQB = Close Quarter Battle) in a narrow room. Of the three versions of CQBR, the model called "Block1" is available in his gas blowback machine gun! By installing new mechanisms such as the Z system developed for the M4A1 MWS, we pursued the reality of