CHAMBER/CASE LENGTH GAUGE .300 AAC BLACKOUT

The RCBS Chamber / Cartridge Gauge is a one-piece, non-adjustable gauge designed to check all critical dimensions of pistol ammunition to insure proper fit. Simply drop a loaded round into the precision made gauge, and if your cartridge fits the gauge, it'll fit your pistol. Gauge checks both chambering as well as cartridge length. Check case length, diameter, and overall cartridge length. Easy-to-read engravings display caliber size. Made in USA.