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Posted: 1/1/2012 4:28:52 PM EDT
[Last Edit: 1/5/2012 9:39:30 PM EDT by BWoodNC]
Link Posted: 1/1/2012 5:27:37 PM EDT
Barrel is measured from closed bolt face to end of muzzle, or perm attached muzzle device.

Easy way is to close the bolt, stick a cleaning rod down the barrel, mark at muzzle, and measure.
Link Posted: 1/2/2012 7:02:21 AM EDT
looks like a 7-71/2" make cant tell from pics
Link Posted: 1/2/2012 7:05:54 AM EDT
[Last Edit: 1/2/2012 7:06:14 AM EDT by thatdude596]
are there any markings?
Link Posted: 1/2/2012 7:16:29 AM EDT
from the pictures I would guess a M1S 7.5inch upper, I had one just like it.
Link Posted: 1/2/2012 8:26:28 AM EDT
Per Scallywag's measuring instructions it's 8.5" to the end of the birdcage. I didn't feel like popping the birdcage off to get a measurement on just the barrel.
Doesn't the A2 usually add 1.5"? So the barrel should be 7"? Feel free to call me the village idiot if I'm not making any sense, but please educate me while you're at it.
There's no markings that I can see. Do I need to get the hand guard off to find some hidden information? I'd like to find out if this upper can take 5.56 Nato rounds.

Link Posted: 1/5/2012 10:36:11 AM EDT
Looks to be a 7" Rock River upper
Link Posted: 1/5/2012 11:33:02 AM EDT
could be one of these? saw this linked in another thread:
http://www.jsesurplus.com/custom7bd9mmssyhmfloat4railgba1flashhidercomp­lete-intropricing-3.aspx
Link Posted: 1/5/2012 12:08:48 PM EDT
Alright, I found some barrel markings. I can't see much because I didn't remove the handguard, but I do see DPMS 5.56. I'm still looking for any help I can get on learning more about the upper. Is it safe to assume it's a Kitty Kat barrel on an A4?
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