Third quarter of 1943. I.B.M. built about 5.6% or 346,500 carbines. It is one of their early builds, about 7,800 into their run. Though not rare it is from a maker with a lower production. You haven't mentioned how the other parts are marked. Having an adj rear sight usually means a rebuild. Condition, originality, all contribute to value. Without knowing more it appears to be a rebuilt, possibly mixed parts, gun.Information
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