Information:

13" length free float rail mount with Picatinny Top rail and M-LOK slot system.  Steel barrel nut included.  CNC machined from Quality aluminum and black anodized. Super lightweight, only 13 oz with barrel nut.

A true free float rail, which connects only at the barrel nut. Since the rail doesn't touch the barrel, shooting accuracy is improved in comparison with two piece rails, when used with grips / bipods that can flex the Steel barrel.
Includes steel barrel nut and screws.

These will fit 223/5.56 uppers.

Details:

Specs:  13" Long, 1.5" wide, 2.0" tall.
Weighs 13 oz.