The M1 Garand

I have seen the GI style and the adjustable orifice one where you use a small hex key wrench to open or close the orifice to regulate pressure on the piston face.
 
For those really paranoid about modern sporting in a Garand, there's those adjustable gas plugs. I have one where you can swap out the screws, and at extreme setting, the gun becomes a straightpull.
 
modern sporting 150 at typical pressures will feed just fine in a Garand without hurting anything in my experience. anything over about 168gn starts to become an issue though with prolonged use. I would avoid the 180's.
 
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