M1 GARAND - USGI - HRA - Wide Base Gas Cylinder

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USGI M1 Garand HRA Wide Base Gas Cylinder with Swivel The bore measures 0.528+" (see pic #5 with 0.528 gauge inserted.) This is a "GO" gauge and must insert into bore without binding. Notice bore will not accept a 0.530 guage. (See pic 6 where 0.530 gauge stops at end of threads and will not enter bore, thus bore diameter is less than 0.530) This is a "NO GO" gauge and should not enter the bore area following the threads. Center stake on swivel screw, dark screw, all depict HRA production. Nice condition and finish. Sight base width measures 0.585. Came off a functioning rifle. Thanks for looking. Will be happy to combine shipping costs. No foreign bids accepted...period.