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I have a AR45 with magwell cut to take grease gun magazines and a AR15 with Hahn block and 9mm upper that takes sten magazines. Both guns are blowback and very reliable.
I like the AR45 but 45 ACP isn't cheap and its super easy to run through a ton of it. Buy far it is my favorite pistol carbine. I actually put 45 rounds through mine today.
I enjoy the 9mm carbine because 9 ball is cheaper these days. Therefore more range/training time.
If I was to buy a pistol carbine today I would absolutely go with a AR platform and the edge goes to 9mm cartridge.
I would recommend the RRA or Colt. Rock River being the more economical and 9mm being the economical caliber.
That all being said my go to carbine will always be 5.56mm.
MK262M1 sends
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