Ragnar
Ultimate Member
I apologize if this question has been beaten to death, but is a piston AR15 with a M4 profile barrel in 5.56/.223 legal?
My opinion, yes, they're legal. In order to be copies, MSP has said they need to have completely interchangeable parts. Since you can't change all of the parts, not a copy. But I am not a MD Regulated FFL, a lawyer, nor MSP (The order MSP wants you to ask such questions in...). But I know some FFLs are still selling piston rifles.
Scroll down here:
https://www.mdsp.org/Organization/SupportServicesBureau/LicensingDivision/MainLicensingPage/LicensingandRegistration/Firearms/FirearmSearch.aspx
Not banned by name though, banned as a copy. Personally I too think MSP got this one wrong. I'm just a guy, just my .02.
Is that a 16+" piston upper you have? If so, unfortunately you couldn't swap it onto a lower bought post-10/1 (that'd be making a banned ALG).
If you planned on SBRing that new lower, making it a pistol or an HBAR you'd be all set though.