Quarter Circle 10 Auto Bolt Assembly - .357 Sig / .40 S&W / 10mm

These Pistol Caliber Bolts are machined by us here in Tucson, Az. Our bolts have the “Glock” cut in them allowing them to run through a standard Glock magazine with no hangups. In addition they are ramped for the use of standard and other similar AR15 hammers. Bolts come complete and ready to run.

This bolt will allow the use of both .40 Smith & Wesson along with .357 Sig rounds.

Bolts come with firing pin, extractor and a weighted mass in the rear.