I used to have a raptor arms rifle,which the mossberg atr is a direct copy of,in fact,mossberg must have bought the machinery and tooling when raptor arms folded.
Mine was beset with problems,from very poor bedding in the stock,to poor design ,or at least poor execution of design,to the scope base had to be shimmed .050 on one end to let the rings line up.I ended up selling it for half of what i paid for it,and was glad to be rid of it.

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[the member formerly known as fluffy}