![]() ![]() The recoil plate is marked “SG” which is a Saginaw Gear mark (page 135). The Type II rear sight is marked with a faded “H in a shield” on the right which was used by other manufacturers (page 30 & 184). The front sight is marked “N” which is consistent with NPM and others (page 56). The Type III barrel band is marked “AMCO” which is a post WWII rebuild mark (page 59, 60 & 184). The right lug of the bolt is marked “AOB” which is an IBM mark (page 36). The inside of the operating slide is marked “PI” which is an Inland mark (page 65 & 66). The rotary safety is marked “circled S” which is a post WWII rebuild mark (page 63 & 184). The Type IV magazine release is marked “M” (page 98). ![]() The hammer is marked “WI” which is an Inland mark (page 89-90). The right rear of the trigger group is marked “INLAND” which is an inland mark (page 48). Marlin supplied barrels for NPM (page 50-51). ![]() ![]() The “U” is for the NPM subcontractor Union Switch and Signal (page 21 of Craig Riesch’s book, U.S. CARBINE / CAL.30, M1” on the front and “NATIONAL / POSTAL METER / 4346684 / U” on the rear. Markings: The import mark on the barrel reads “BLUE SKY/ARLINGTON, VA.”. There are no specific dates for Union Switch & Signal receivers as their deliveries were late to NPM (page 29 of Scott Duff’s book The M1 Carbine Owner’s Guide).Īction Type: Semi Auto, Detachable Magazine Union Switch & Signal produced the receiver under contract for National Postal Meter (NPM). Arrow_back Returns To All Sold Items arrow_back Return To Sold Post-1900 U.S. ![]()
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