Anytime anyone makes a post about a pistol-caliber carbine there is a contingent of people who feel compelled to demand the poster explain how they feel served by a carbine in that caliber as opposed to the carbines ‘normal’ chambering of 5.56.
I’d like to save everyone some time and bandwidth by skipping that argument and just move on to the guns.
Although I have dozens of 5.56 AR carbines, I didn’t have any in 9mm. I do have some Mp5 clones, and a couple Ruger PC Carbine/Chargers that take Glock mags, but I’ve been wanting something that had all the function and form factor of the AR platform.
When you start looking at 9mm ARs you notice something interesting – very few Glock-compatible ARs have last shot bolt hold opens. This is because of the mechanical contortions of getting such a device to work with a magazine that is wildly different dimensionally from an AR mag. Most manufacturers simply sell ARs that don’t have the last shot hold open, but…some do.
I ordered up a carbine from Angstadt Arms. Their website said that their guns would lock open on an empty mag and that’s what I was looking for. Their website also said their barrel was threaded 1/2×28 which would let me use a couple of the 9mm cans I have here on the shelf.
Surprisingly, while the AA carbine lived up to the last shot hold open, they did NOT thread their barrel 1/2×28. For reasons that I am sure make no sense, they threaded it 1/2×36. I cannot overstate what an inconvenience this is. This means that I need to order a different adaptor for each 9mm suppressor I wanna use on this thing.
What I wound up doing is getting a tri-lug adaptor for the gun, and then a tri-lug adaptor for the Obsidian suppressor. So, at least this way I can use the tri-lug on my Mp5 clones as well.
However, I fired off an email to Angstadt Arms asking them why the rifle I purchased did not have the threading that was clearly denoted on their website description. No answer yet.
And, because one is none, I also ordered KE Arms version of the same gun except built on their one-piece polymer lower. This should be a very lightweight gun. Will post about it when it gets here.
