This is a TROY Rail known as the BattleRail, model SRAI-ML1-13BT-00.
TROY is proud to offer their M-LOK rails in response to customer demand. Machined from hardened aircraft aluminum with stainless steel components and finished in MIL-SPEC hardcoat anodizing" the M-LOK rails are light and sleek. Easy to install and mount accessories. Works with standard AR15/M16 barrel nut. Barrel nut not included.
Features:
Black finish
M-LOK aluminum BattleRail
Fits AR 5.56;13 length