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Old September 1, 2013, 08:45 PM   #2
Rob62
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Join Date: June 28, 1999
Location: Georgia, USA
Posts: 560
I don't know but I am going to tag this thread. I should be going out to the range this week sometime to shoot my .223/5.56, 10.5" barrel SBR'd AR15 and can compare it to my AR15 M4gery with 16" barrel.

When I do the chronograph check I'll post the results here.

Somebody has probably already done this however and will beat me to the punch.

Note - without question I expect MV will be less with the shorter barrel. How much I have no idea. My best guess is about 75-125 FPS per inch of barrel.

Regards,

Rob
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