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Posted: 9/17/2004 10:42:38 AM EDT
I recently purchased an A3 upper and it has T-marks on the rail and is gray in finish. I plan to mate this upper to a YHM BMAS 4-rail handguard. The rails on the upper and handguard were level. However when I screwed a Bushmaster A3 upper and the YHM handguard together the rails didn't line up at all, off about 1/8"!
My question is what is going on with the height of these two uppers?
Link Posted: 9/18/2004 8:41:43 AM EDT
I just built my new upper with a YH FFT and the upper was a RRA, everything indexed fine.
Link Posted: 9/18/2004 8:45:02 AM EDT
[Last Edit: 9/18/2004 8:45:23 AM EDT by Combat_Jack]
No, not all of them are the same spec. Only Armalite, Bushmaster and Colt can be counted on to have an in spec rail.

ETA: Probably LMT also, but i have not checked.
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