This B&T Handguard was designed for the Colt M4 Carbine. It also fits the Diemaco C8 and identical weapons, such as the AR15 pattern rifles.
 
The handguard has 4 NAR/Picatinny Rail, one on each side. The handguard also offers a PEQ-2 interface and an integrated heat shield.
 
Made in Switzerland.