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Need advice on this POS AR15 shortstroking!

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Measure the damn gas port hole on the barrel.  If it is short stroking with a carbine weight buffer, it's likely going to short stroke with a rifle weight buffer. 

If the barrel was intended for a soft shooting set up, it may be undersized and expect you to have a lightened carrier and reduced weight buffer. 

For example a nordic components 18" barrel ships with an undersized gas port for that reason. 

If it's small you have two choices. Lightened components or drill it out. 


If you (or someone you know) can get dealer pricing from brownells their in house lightened one is cheap. $80 ($125 if you have to pay retail). 



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