You will be legal if you are 18+ to posess a BP revolver. FID required for the powder, caps, lead balls etc. LTC is required if you plan on carrying concealed.
Black Powder Handguns – No LTC Needed! In April 2012, the court case of Commonwealth vs. Jefferson, it was determined that firearms manufactured before 1900, including black powder handguns are exempt from the licensing requirement in G.L. c. 140, § 131.
This ruling overturned the decision made in the Commonwealth v. Bibby case in 2002 where it was determined that black powder handguns were considered a firearm under c. 140 § 121, and therefore needed an LTC to be possessed outside the home pursuant to c. 269 § 10 (a).
Because c. 140 § 131 governs licenses to carry firearms, and because § 131 does not apply to firearms manufactured before 1900, a person does not need a license to carry a firearm made before 1900. However, a person may still be convicted of the unlawful possession of ammunition loaded in a firearm manufactured before 1900 if the defendant does not have an FID card and the ammunition does not fall under some exemption.
(please note Chapter 140 section 129C has not been updated to show this change)
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