This is a flat sided (without the original reinforcement ribs) top cocking upper receiver with adjustable front sight and your choice of 9mm or 45acp barrel. It is made entirely of steel with a parkerized finish which is the traditional finish of the MAC series of guns.
The 9mm barrel is the standard length with standard threads of 3/4-10 TPI. The .45acp is the standard length with standard thread of 7/8-9 TPI. They are pinned in place and made of CrMoV MIL-B-11595 material with 6 – groove, 1:10 twist and precision air gauged with inert gas vacuum stress relieved after button rifling process. The finishing is manganese phosphate, the traditional dark gray/almost black parkerizing of the MAC series guns . These were profiled on centers to provide accuracy between bore and profile which has been a problem we’ve experienced with other manufacturers’ barrels in the past.
This item is a custom order item, please allow at least two weeks for shipping.
Note: Lower receiver and bolt assembly not included.