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AR15.COM
5/25/2010 4:09:54 PM EDT
I recently purchased one of your 14.5 lightweight barrels and am having trouble installing a

handguard cap.  If I leave the handguard cap off the FSB pins line up and install fine.  If I try to install the

cap it pushes the fsb over to far to install pins.  

Update * fixed problem by putting a light bevel on inside of cap so it fits flush with shoulder


5/27/2010 6:14:21 PM EDT
[#1]
maybe it's trying to say it wants a free float handrail?  is the cap deformed/bent?
5/27/2010 8:05:44 PM EDT
[#2]
The cap isn't bent, but is a tight fit on the barrel.  There seems to be a slight step up right before the shoulder.
I wonder is the cap is out of spec.