Question on fixed mag in MA

Nkiv

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I'm considering building a fixed mag AR for MA. Does it matter how the fixed mag is attached to the lower? Does it have been welded/expoxied to the lower? Or can you use something like an AR maglock where the mags will detached but you have to break the upper and lower apart first before you can change the mag?
 
Fixed mag AR’s are horrible. Why do you want to to that?
Also I believe the lower has to be manufactured as a fixed mag lower. Not modified after the fact.
not to give any credibility to her pile of garbage, but it could be interpreted that if a lower is “originally assembled” as not capable of accepting detachable magazine, itbis exempt. But it isn’t law, so is it really worth splitting hairs over?

If a weapon, as manufactured or originally assembled, is a Copy or Duplicate under one or both of the applicable tests, it remains a prohibited Assault weapon even if it is altered by the seller. Therefore, a Copy or Duplicate will be treated as an Assault weapon even if it is altered, for example, by pinning the folding or telescoping stock in a fixed position, by removing the pistol grip, by removing a bayonet mount or flash suppressor, or by preventing the weapon from accepting a detachable magazine.
 
If you want to build a fixed mag AR pistol in Mass for fun not practical purpose, that's cool. Otherwise don't bother. Mean Arms says their MA lock is legal, FWIW.
 
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