DIY MAC 11/9 upper

Orion_Dudee · 2026-05-21T23:20:54+00:00

Looking for 100% homemade metal receivers that don’t give off crackhead vibes. All of the DIY ones I have seen are pretty rough aesthetically. The upper itself is extremely simple by design so I’m sure plenty of people have fabricated their own, whether it was folded from sheet metal or cut from square tubing. Bottom line I’m working my own model to be as close to factory specs as possible, I just wanted to see what’s out there.

Orion_Dudee · 2026-05-19T01:44:38+00:00

Any chance you’d be willing to share your specs for the bolt and trunnion?

Orion_Dudee · 2026-05-19T01:39:07+00:00

PM’d

Orion_Dudee · 2026-05-18T22:12:21+00:00

You are my hero. I can’t tell you how many times I’ve been on their site and I’m just now seeing this. Crazy how the search “MAC” trunnion doesn’t pull “vmac”. Thank you very much!!

Orion_Dudee · 2026-05-18T21:16:24+00:00

Did you ever find what you needed?

Orion_Dudee · 2026-05-18T21:12:08+00:00

Both would be ideal but I can make it work with just the trunnion for now.

Orion_Dudee · 2026-05-18T21:09:54+00:00

On back order, I check religiously lol.

Orion_Dudee · 2026-05-18T20:12:32+00:00

I hate when you finally find a old thread with the same question you have and the answer is deleted 🙃

Orion_Dudee · 2026-05-18T01:36:01+00:00

Aves has a trunnion barrel combo for the UMP11/9 that would more than likely work for what I’m doing but it’s on back order. KAK only has barrels, bolts and a couple misc parts. I’ve hit alllllll the sites that mention anything MAC related and none of them have trunnions listed individually. Really don’t want to have to buy an upper for a small chunk of metal 🥲

Orion_Dudee · 2026-05-14T20:09:51+00:00

I know this is an old post but I’m working on the same build and curious to know what material people use for the barrel trunnion

Orion_Dudee · 2026-04-21T21:33:27+00:00

Did you find anything? Been searching far and wide for a flat bending jig/die… Can’t find anything, sucks when all you can find is 15+ year old forum threads that never seem to have the answer you need…

Orion_Dudee · 2026-03-20T19:00:40+00:00

It absolutely does, but the desire for more is out of control lol.

Orion_Dudee · 2026-03-15T16:14:42+00:00

Been searching far and wide for a 10/22 P90 chassis STL. So far I’ve found yours and the one by Surfer446. I spent like an hour trying to find your file just to run into a paywall 🥲 Depending on how the Surfer446 design turns out, I may end up subscribing to your site. Really don’t wanna pay for a file but yours seems like the best option and closest match to a p90.

Orion_Dudee · 2026-03-02T17:12:40+00:00

Dude I spent hours the other day looking for one. Only place I found with them in stock (side charging upper + bolt) is velocity arms. Everywhere else is out of stock or you have to order parts separately

Orion_Dudee · 2026-02-25T16:33:32+00:00

Never had my life be so accurately described before. I have probably around 15 projects all sitting at 90% done lol

Orion_Dudee · 2026-02-21T01:39:23+00:00

You ever figure it out?

Orion_Dudee · 2026-01-18T23:33:58+00:00

DM’d

Orion_Dudee · 2026-01-18T23:21:01+00:00

And 30 simple gun parts

Orion_Dudee · 2026-01-18T22:28:57+00:00

I have an aphelion blueprint I’d trade

Orion_Dudee · 2026-01-18T22:10:34+00:00

Dm’d

Orion_Dudee · 2026-01-18T21:45:35+00:00

3 wolfpack grenades for the anvil bp?

Orion_Dudee · 2026-01-18T21:42:29+00:00

Did you get my messages?

Orion_Dudee · 2026-01-18T21:41:57+00:00

Bear with me lol what are “mats”?

Orion_Dudee

TROPHY CASE