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having trouble cycling subsonic ammo, I've switched the gas system to work with suppressor as well. im using the Omega 300 can from silencerCo and Atomic match subsonic 175 grain Sierra matchking
 

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Leave the gas system in the 12 o’clock position for a start. You want more gas, not less. Still probably won’t work IMO.
 

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From what I was told about the 16s which should apply to its big brother the bolt carrier is too heavy to cycle subs. It would require lightening and a new lighter recoil spring.
 

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I'm thinking anything can cycle anything - as long as you have the correct gas jet.

And of course that means it can no longer cycle other stuff. But if you want to dedicate to one mission, it ought to be doable.
 

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Possibly. But subs are basically pistol levels of gas. With stock recoil spring and bolt carrier and the jet fully open you still might not get enough gas to unlock and run the system.
 
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