AR build

Bear

New member
I'm looking at an upper with a 1/9 twist and want to know how heavy a bullet it will stabilize.
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Depends on barrel length too. A long tube 1:9" will behave much better with heavier pills than a short tube. I have trouble with anything over 70grn in my 1:9" 16" carbines (75's and 77's), but they do relatively well in my 18" tubes with max or near max loads. Longer barrels do quite well with them.
 
Varminterror - which length of gas tubes are you running?

16, 18, & 20 inch barrel lengths have been good. All have mid or rifle length gas systems.
 
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