I bought this upper and didn’t realize it came with a .70 gas port hole. Would I run into in issues if I get a gunsmith to open up to a .750 so I can run steel cases ammo or weak 223 brass ? I already tried different buffers to see if I could make it run 233 but no luck
UPPER CRANE SPEC | 10.3 INCH PARTIAL UPPER | ANDRO CORP
UPPER CRANE SPEC | MK18 CLONES | 1 MOA Guarantee | Do You Run Suppressed | Reduced Gas | Partial Upper for those who have a rail already |
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