M1 Garand Armory

General Specifications

M1 Garand General Specifications

Operating Rod Specifications

Piston Diameter: .5260 to .5253 (under .5250 calls for rejection)
Piston Thickness: .190 to .155
Tab/Lug Height: .320 to .317 (under .310 calls for rejection)
Tab/Lug Thickness: .100 to .095
Tab/Lug Width: .265 to .235

Maximum Out of Roundness Specification = 0.00035

Tab/Lug Height: .320 to .317 (under .310 calls for rejection)
Tab/Lug Thickness: .100 to .095
Tab/Lug Width: .265 to .235


Gas Cylinder

Gas Cylinder - Maximum Diameter Specification (main part of cyl.) = 0.530" (field reject @ 0.532")

Chamber

The SAAMI specification for .30-06 is:
Datum Diameter at Shoulder = 0.375"
2.0487" Minimum headspace
2.0587" Maximum headspace 

 Forster gages, which Forster describes as:
Datum Diameter at Shoulder = 0.375"
2.049" GO
2.055" NO-GO
2.058" FIELD

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