I just installed a 7" UTG and everything needs to be removed off the barrel according to the instructions that came with it. Also depending on your barrel nut, you may need change that out too. Think of it like a barrel swap. If you have the tools to do this, you should be good. The one I just did had the same barrel nut and I did some drilling and filing because the way it is designed, the UTG( 7" atleast) won't slide over a low profile gas block. What I did was remove the material around the gas tube hole of the handguard to make it a groove. It took me 15 minutes to do this. It all depends on what your gun setup is really. If you have any questions, you can send me a PM and I can walk you thru what I did.
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15T,15-22,5946 & some not S&W
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