US Machinegun upper receivers

[carpecervisi]

WarHound1, ncjeeper, much appreciated. The credit goes to the others that paved the way. I just threw money at a dream.

Thanks everyone for the mag catch instructions. I took a few hand files to two of my mags and they lock up tight as a drum now. Can't wait to hit the range tomorrow.

THANKS MIKE AND RICHARD!!!!

 

[carpecervisi]

Mike's USMG upper ran like a sewing machine today at the range. Counter clockwise, the initial 10 round mag dump followed by two 40 round dumps. I had one FTE due to poor mag loading on my part. All I could hear was the "clack clack" of the bolt. The awesomeness hit me right in the feels.

 

[3154tm]

CF said "I'm thinking as my grip bracket grows in popularity Mike will offer the uppers with the accessory holes in the front like MPA does." if he does, it'd be nice to have a little more clearance for the screw heads by spacing the screw holes a little further away from the lug at the base of the barrel where it registers against the trunion.

 

[CoffeeFreak]

CF said "I'm thinking as my grip bracket grows in popularity Mike will offer the uppers with the accessory holes in the front like MPA does." if he does, it'd be nice to have a little more clearance for the screw heads by spacing the screw holes a little further away from the lug at the base of the barrel where it registers against the trunion.

The 8/32 allen head screw just fits. You can turn down a button head allen screw a little for more clearance. Put wrench cuts in your trunion stop top and bottom and it will clear better. Unfortunately, No room to move the top screw up and if you moved the bottom screw down I would have to make a separate bracket for that setup. MPA has other accessories that use those holes so they would have to stay in the same place for the ones they sell.

 

[ftldrben]

Ditto.

This...

FWIW: I only run USMG uppers on my M10/45's and Lage's (speediest bolts, always!) on my M11's.

 

[3154tm]

CF, that's exactly what i ended up doing, turned the heads of the socket head screws and filed flats on the lug just enough to give the necessary clearance. i hadn't thought about MPA's product line with respect to moving the holes. i have an ftf upper with no threaded holes and i may experiment with that. it looks like a 1/32" or 3/64" might make all the difference. except for needing even more spacing it'd be nice if these were 10-32. those 8's sure are small.

 

[macs_imum]

M10 45 side cocker

Didn't see it on the web site and no answer on the phone. Does mpa have a m10 side cocker?
Thanks all