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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.
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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