Birmingham Small Arms Company (BSA) Rifle Lowers for Sale

The Birmingham Small Arms Company Limited (United Kingdom) is represented in rifle lowers through its government‑contract production of the British L1A1 Self‑Loading Rifle beginning in the late 1950s, which included lower receiver/trigger‑mechanism housing assemblies often marked with “UB” maker codes and year stamps. BSA rifle lowers are original British inch‑pattern, imperial‑dimension L1A1 components identifiable by the folding trigger guard and two‑position “S/R” selector legend, and they are sought for correct UK L1A1 builds rather than aftermarket AR‑type lowers.