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  #11  
Old 03-20-2019, 04:27 PM
pickax pickax is offline
 
Join Date: Jan 2011
Location: Daytona Beach Fla.
Posts: 991
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Seems to me 180 gr. is pushing the op rod and springs. You can smooth out the pulse with this plug. http://www.garandgear.com/ported-gas-plug.html
Also look at the testing they have done with assorted commercial ammo from the main page.
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  #12  
Old 03-20-2019, 07:42 PM
hogfamily hogfamily is offline
 
Join Date: Apr 2018
Location: Alaska
Posts: 166
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The CMP M1 manual says that you can shoot up to 180grn bullets.

No special gas plug needed.
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