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Are they Mass compliant?
Yes legal issues are in question
Well, they aren't illegal and are not one of the evil parts in an AWB configuration. But there is no compliance testing in place for them if you want me to answer your question directly.
Short answer: You are AOK with the PRS...
The trigger time I had on one was impressive. Mine was on a Troy MCS and it really lent itself well to the platform. Seems to be more of a stock for a precision long range shooter and less for a carbine-type or basic fighting rifle...
My main purpose would be to have comb adjustment for scope. It is a carbine. I plan on bench shooting this with a good scope. If I really catch the bug I will get a target/varmit AR build going early next year. So I would play with the magpul on what I have. Practice skills with carbine until funds are there for target rifle set up.
Compliant to the Mass AWB rules and regulations is what I was getting at
My problem is not with eye relief on the scope just my eyes are not up high enough to line up with the scope.