Using the G&P Geissele Super Duty receiver and the MK16 SMR handguard which is a lightweight yet highly modular handguard. The SMR is a free float rail that features even more modularity over the MK* handguard. The MK16 URGI has also recently been adopted but the US SOCOM
-MK16 SMR 9.5" MLOK Handguard
-Standard LDX Gearbox
-M100 Spring
-Average 330-350 FPS
-Warintrest Nylon Mag