Continuous top picatinny rail with m-lok attachment system at the 3, 6 and 9 o'clock positions.  Hard coat anodized coating and machined out of 6061-T6 aircraft grade aluminum.

Included steel barrel nut ensures no play when installed.

Requires a 1 1/8" crows foot wrench to install the barrel nut.

• Inside Diameter: 1.36"
• Outside Diameter: 1.61"