Developed by BSA and Captain H.C. Boys under the name "Stanchion" and renamed on acceptance in 1937, the Boys Rifle fired a proprietary 55 caliber armor piercing round. Many were converted to 50 BMG after WWII, with few left in the original 55 Boys and fewer still brought back to the States. This example bears a "SA" cartouche, the acceptance proof of the Army of Finland. Though technically aligned with Nazi Germany and the Axis, Finland received material support from some Allied nations during the Winter War with the Soviet Union. Fitted with the early "circular" muzzle brake left-offset blade front and two-position elevation adjustable peep sights and a top loading Bren-style magazine. The barreled receiver is installed in a steel frame with integral shock absorber, folding "T" shaped monopod, hardwood cheek rest and rear pistol grip, and a canvas shoulder pad with integral oiler.

Very fine, with 85% plus original black finish, showing a large amount of storage grease overall and some mild handling marks. The wood cheekpiece is lightly worn, with some scuffs and scratches on the grips. The pad shows some tearing along the top, and mild external stains and scuffs. Mechanically excellent. NOTE: This Destructive Device is a National Firearms Act (NFA), fully transferable Class 3, which is registered with the Bureau of Alcohol, Tobacco, Firearms and Explosives, (BATFE) under the provisions of 18 U.S.C. Chapter 44 and 27 CFR part 478.