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Upper Receiver – Side Cocking With Barrel for the M10/9 or 45

We are sorry this item is out of stock. We are always manufacturing our products and do our best to maintain adequate inventory levels. But in all things in life "the squeaky wheel gets the grease" so we have either just ran out of this item, or it's waiting it's turn on the priority list. If you would like to be added to a list of people to contact when this item is back in stock, please contact us at: 410-404-0320 or



This is our M10 side cocking upper receiver. It will come with either 1/4″ (shown) or 1/2″ 1913 Picatinney  rail. There will be a $25.00 charge for the 1/4 rail due to additional machine time.  It is entirely made of steel and has an adjustable front sight.  The cocking handle is nonreciprocating and spring loaded.  The upper is parkerized 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.


Additional information



Rail Height