CMMG in SR556

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It should.... if I was using one, I'd turn the gas to the OFF pos., since the conversions don't use it.....blowback operation.
 
The only thing I can think of is the piston reaches a little further into the receiver than a gas tube on a DI AR carbine. I'd hate to see you spend ~$200 on a conversion and not be able to use it. Perhaps asking Ruger is in order.
 
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