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I've gone through about a thousand of these so far. I built an 8 inch gun with a shortened pistol length gas tube in order to try and run these subsonic or so to shoot some local steel matches. Here's my experience, YMMV.
The good.
The gun runs great. Right now my load is either AA#9 or Lil Gun with about 12gr. of powder and it burns very clean.
The bad.
sometimes the bullets will break in two while making the trip to the chamber, sometimes they break into small pieces and wreak havoc upon lockup. I have noticed though that this happens more when it is cold and is less frequent in warmer weather. I recently shortened my OAL abit and it hasn't happened since then.
The very bad.
These things are soft. I don't know what they are made of but they leave alot of "material" in the bolt. I think that as they pass the gas port they get shaved a bit and that stuff finds its way into the bolt. After about a 120 rounds or so the bolt is almost impossible to move by hand. Upon disassembly the gas ring slot is filled with this stuff. So I end up cleaning this thing way more than I like. (I don't like to clean at all!)
Right now the great debate raging in my head is whether to just make this thing blowback as I'm not sure how to overcome the shaving bullet issue, other than frequent and rigorous cleaning which i abhor. Obviously I could ditch these bullets in favor of jacketed ones, but I tend to be a bit stubborn and will keep at something until I've exhausted either all options or money!
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