Upper Receiver – OEM Top Cocking with Barrel for M10 9mm or 45 acp.


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This is an original OEM Top Cocking Upper Receiver complete with the reinforcement ribs and Cobray© Logo.  The only modification from the original design is the inclusion of the hole for the barrel roll pin in the trunnion.  We found a limited and old supply of the original sheet metal body and front sight and welded in our trunnion.  This upper will work with 9mm Full or Semi Auto guns.

Barrel options for 9mm are: The standard barrel threaded 3/4-10, the stubby barrel threaded 1/2-28 or the double threaded 3/4-10 and 1/2-28.   Barrel options for the 45acp are: The standard barrel threaded 7/8-9, the stubby barrel threaded 5/8-24 or .587-28 or the double threaded barrel threaded 7/8-9 and 5/8-24 or .578-28.   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.   If you select a barrel with 1/2-28 threads, we do NOT recommend shooting this barrel in full auto with the 1/2-28 threads exposed due to the thinness of the barrel wall at the 1/2-28 threads.  Repeated firing with exposed threads may cause the barrel wall to weaken and/or split.  We recommend always using shooting this barrel with a barrel accessory, such as a thread protector, flash hider, or suppressor firmly secured to the end of the barrel.


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