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Posted: 8/3/2021 6:56:19 PM EDT
12.50''  bbl(xm177 buld)   midlength gas using 55 gr  fmj. What should the gas port size be?  It will be insurpressed.
Link Posted: 8/5/2021 8:01:42 AM EDT
If I recall correctly the KAK 12.5” mid-gas are ported at 0.086”.  I’d probably start at 0.078” for something with a suppressor full time.  For shooting lower powered steel case practice ammo with just a flash hider the 0.086” is probably pretty close.  If you plan on adjustable gas the bigger port is also one and done.
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