Proof Research 138960 Bolt Action Barrel Pre-Fit 260 Rem 20" 1:8" Twist (5 Groove), 5/8"-24 tpi Threaded, Stainless Steel, Drop-In Design for Sig Cross Dummy Rounds The American Rail Adapter Stud

The American Rail Adapter Stud 6A is for for American size rails

Standard configuration is 7" cable length

as well as the civilian semi-automatic SCAR 16S & 17S rifles

four colored spline drive breech lock bushings

With a variety of consistent and affordable bullet options

Proof Research 138960 Bolt Action Barrel Pre-Fit 260 Rem 20" 1:8" Twist (5 Groove), 5/8"-24 tpi Threaded, Stainless Steel, Drop-In Design for Sig Cross Dummy Rounds The American Rail Adapter StudThe times of sending off your Sig Cross to have the barrel changed is over with Proof's drop in barrel Design! Stand alone and guaranteed to headspace is achievable at your own home with no gunsmith required!