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Gunsmithing M40A1 build question..

Charlie112

Herd Thinner
Full Member
Minuteman
Feb 28, 2017
739
915
USA
If I build a rifle to fit the title, with the correct parts, can I use the period correct bottom metal if I change the caliber to .223? Possible 20 inch barrel with break, instead of correct 308 barrel length.
Thanks, Charlie112