What is the minimum diameter acceptable for an op rod piston and still be serviceable for the M1 Garand?
What is the minimum diameter acceptable for an op rod piston and still be serviceable for the M1 Garand?
Last edited by Bob K; 08-30-2014 at 05:59.
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.525 but it might work if a little under if the gas cylinder is tight.
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http://www.biggerhammer.net/manuals/
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If the rifle functions, then it is fine.
Sir, per Kuhnhausen, 0.5253" is minimum and 0.525" is no-go.
That said, I do have one op rod that mikes 0.525" and works fine so long as the ammo is up to spec. Weak ammo, like some of the LC 69 the CMP was selling 10-ish years ago, won't always cycle the action.
Hope this helps, and Semper Fi.
Ron H.