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Posted: 12/24/2003 8:19:25 AM EDT
I wanted to find out if there are any gas system reliability issues caused by cutting down the barrel on a full length AR to 16". I'm sure a # of folks around here must've experimented with this idea.
Link Posted: 12/24/2003 8:34:33 AM EDT
Yes there are issues.  It requires a change to the size of the gas port.
Link Posted: 12/24/2003 3:32:39 PM EDT
What needs to be done to make it work?
Thanks - 00BS
Link Posted: 12/24/2003 5:11:42 PM EDT

You can find some information regarding port sizes in relation to barrel length/diameter at Forest's great site:


But if you are seriously interested in cropping a 20" to a 16" you may want to consider Kurt at KKF for the job... He offers a 'KurtzGewher' package that includes gas port work, and Kurt's workmanship is outstanding...

Kurt has a forum here on ARFcom in the Industry section or you can find him here:

Link Posted: 12/24/2003 6:05:12 PM EDT
Link Posted: 12/24/2003 6:58:16 PM EDT
Why not just buy a new barrel? Or upper?
Link Posted: 12/24/2003 7:11:37 PM EDT
Link Posted: 12/24/2003 8:30:41 PM EDT

If it is a used barrel with a few hundred rounds through, could there be an issue with barrel harmonics?
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