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Sig has implemented a MCX recall. They are proactively replacing all the bolt carrier assembly with a newer version. Send the one you have and get the new version in about 10 day business days. I know of several people who have done this without any issues.
https://www.sigsauer.com/press-releases/mcx-mandatory-carriage-assembly-replacement-program/
There is no need to send the entire firearm back as they do not want it back unless you've done an after-market trigger. Even then, no one in MA would be dumb enough (hopefully) to send the firearm back knowing what the current situation is.
Rumor has it that any aftermarket triggers that go back will be replaced with a kick-ass aftermarket trigger.
Yes, the 7/20/16 Healey ban. The problem is finding a dealer that will take possession to ship it out of state, then receive it back, enter it into his book, then do a NICs check, 4473, and MA FA10 to transfer it back to you after the ban date. This may be a problem with any post 7/20/16 MA BS Ban out of state repair or replacement.
And my dealers point is not trying to interpret the MA regulations with a post 7/20/16 replacement AR receiver coming back, or even if the out of state repair center would take a chance sending it back to the FLL or individual. "I'm not a lawyer able or paid to interpret or render legal opinion" is what my FFL says
The difference is in the link I provided as it describes what was changed.
https://www.sigsauer.com/press-releases/mcx-mandatory-carriage-assembly-replacement-program/
Gen 1
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Gen 2
View attachment 189632
Rumor has it that any aftermarket triggers that go back will be replaced with a kick-ass aftermarket trigger.
Rumor has it you cannot use *ANY* mil-spec or aftermarket trigger with the MCX. It must be a proprietary SIG-designed trigger.
When I bought the rifle I was looking for AR parts compatibility. Now I have yet another Sig rifle that requires proprietary parts and that they will ultimately discontinue supporting in 1-2 years.
Totally incorrect.
I have a geissele SSA-E in my MCX.