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Posted: 3/11/2010 5:48:02 AM EDT
I am considering a 9mm AR pistol build. It looks like the standard barrel lengths are 5", 6", 7.5", and 10.5".

Is there a barrel length that works particularly well for a 9mm pistol?

Thanks.
Link Posted: 3/11/2010 6:50:14 AM EDT
check this thread:

http://www.m4carbine.net/showthread.php?t=961

and this:

http://www.ballisticsbytheinch.com/9mmluger.html

There really isn't much velocity gained after 12" barrel with the 9mm.  I think most pepople go with a barrel in the 7.5-10.5" range.  I chose a 7.5" from Spike's.   I would go with a 5.5" if I was planning on using a suppressor.
Link Posted: 3/11/2010 9:47:26 AM EDT
I have a 5.5", and I run a Trident 3lug.
Link Posted: 3/11/2010 9:49:42 AM EDT
5.5" here, but it is threaded for an Evo-9,
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