Gas Piston No Go gauge

Gas Piston No Go gauge

$200.00
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Hard to find ordnance gauge.  This is PN A-77301.  If your piston slides inside the ring it's toast!  Marked :   30 BAR M18 M18A2 BC30 BMR M22   C-9073 GAS PISTON REJECTION RING   and on the other side   FOR GAS PISTON FIELD SERVICE   A-77301 NOT GO 494 ORD. DEPT U.S.A   It appears unissued, although there is some storage wear

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