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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