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First off, I run propane on all my GBB's. I strongly suggest going with a metal slide if you do upgrade the internals. If you don't do upgrades, I'd stick with the abs plastic. If you put a metal slide on it, the blowback is gonna be sluggish and most of the gas is gonna be wasted in moving a heavy metal slide. You'll still go through a whole lot of rounds with the plastic slide before it starts falling apart.
I don't know if I made myself clear or not. I now exactly what I want to say but 4 cups of coffee is making me insane with a million thoughts going through my head all at once.
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