HD Series Free Floating Quad Rail System
 
Full length 1913 picatinny rail at 3, 6, 9, and 12 o'clock positions
M-LOK modular mounting system positioned between 1913 rail sections
Lightweight yet rigid design
Anti rotation tabs compatible with both forged and billet upper receivers
Proprietary barrel nut interlock system locks up solid for mounting IR devices
 
Internal diameter: 1.25"
Fits forged and billet upper receivers
Integrated QD ports
Vented to reduce heat buildup during rapid fire
 
Hardcoat anodized black
FDE, OD Green, and Wolfpack Bronze Cerakote optional 
 
Weight including barrel nut and interlock system:
6.9" - 12.5oz.
10.5" - 16.4oz.
12" - 18.1oz.
15" - 21.1oz.
 
*Uses a 30mm barrel nut wrench (not included), minimum torque: 38 ft lbs