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If I cut it down, how much do I expand the gas ports?


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On a Saiga 20, 22".  If I chop it to 18.5 or so, how much do I need ream out the gas ports?  

 

Is there a formula for this sort of thing; expand X for each inch of barrel, for example?

 

I did do a search but didn't find anything relating specifically to port size.

 

I assume there's already a tutorial on block removal and all that, but if you have a link handy it would be helpful.

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