This is my M10 "Mac10" rifle cal upper, the UltiMac. I started designing it back in 2017 and this is the fourth revision to the design. It drops on to a M10 smg registered receiver but will not work on any of the semiauto M10s on the market.
This has the AK47 magwell, which will also work with AK74 mags when a different mag catch is employed.
Unfortunately, the Korean AK drum I used here is brand new and not broken in yet, so there were some feeding issues unrelated to the upper.
The magwell is removable and can be swapped out to AR15, Glock, MP5, Thompson, Suomi, Galil, UMP, or pretty much any magwell and caliber on the market.
The recoil mechanism is integral to the lower receiver, so the lower receiver does not have to be drilled like the Alliance Armament Sabre.for the use of a "TASK" style recoil mechanism.
Enjoy!

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