The patented Apex Grade Barrels for the 9mm M&P deliver unparalleled accuracy due to their precise fit to both the slide AND the frame. This Barrel Fitting Jig is designed by master gunsmith Randy Lee and specifically for use in properly fitting the Apex Grade Semi Drop-In Barrels. Why you need this indispensable tool:

– Aids in the proper and precise fitting of Apex Grade Barrels
– Precise fitting can deliver sub 1” groups