Why is this in NFA? With a 16" barrel and a standard AR-15 it's legal normally.
As for 7.62x25 uppers, you're shooting something that's primarily a corrosive round (you bought it because ammo is cheap, right?) through a direct impingement gun. Do you have any idea what a nightmare that's going to be to clean? I honestly see NO point in shooting any corrosive rounds through an AR-15. You're just asking for trouble.
Broken extractors, extractor pins, extractor springs, ejector springs calapced, broken bolt, broken mag adapter, bad carrier, broken cam pin. These things have been a nightmare.
Thanks, that was my thinking also but I cannot convince my friend that that is the way to go. After he gets frustated enough I will make him a bolt and mag adapter with a stationary ejector. I was thinking that a single stack mag like a Sten mag would also be better. Time will tell.
I will not tell you where these units came from because in my opinion they are so poorly designed and will give you nothing but headaches. I don't care how cheap the ammo is it is not worth the trouble.
Just the other day I mentioned this system to a friend and he told me " I used one in the last subgun match and it ran great but it did have a lot of trigger slap and I did break a camming pin". Another unfortunate owner has been struggling with this conversion for over a month and has broken virtually every part except the cotter pin that holds the firing pin. I am doing you a favor.
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