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And the flood of garbage into the AR world has officially begun.![]()
"You people have too much time on your hands." - scottryan
According to some drawings, the recess the rear lug of the upper fits in should be 0.500 + .000/- .004 wide, 0.950 long, and 0.630 deep.
Might give you a better idea what's out of spec. I've got 3 rifles built with AP uppers and they all fit well.
Last edited by LeviTX; 02-13-13 at 14:17. Reason: blueprint measurement reading fail
Before filing or defiling anything, check the RE and check the buffer & BCG for interference. On my ARs, sometimes the upper & lower cannot be closed without the BCG hitting the buffer.
Also make sure the pin isn't sticking in too far & causing interference
Last edited by MistWolf; 02-13-13 at 11:09.
INSIDE PLAN OF BOX
- ROAD-RUNNER LIFTS GLASS OF WATER- PULLING UP MATCH
- MATCH SCRATCHES ON MATCH-BOX
- MATCH LIGHTS FUSE TO TNT
- BOOM!
- HA-HA!!
-WILE E. COYOTE, AUTHOR OF "EVERYTHING I NEEDED TO KNOW IN LIFE, I LEARNED FROM GOLDBERG & MURPHY"
I am American
Unless my calipers are off:
Width
Lower width
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so .003 off. I would chalk it up to tolerance stacking and not junk parts like so many like to claim right off the bat. If it was .03 off than I would suspect junk parts, but .003, tolerance stacking IMO. Probably one swipe with a file on each side will get it to fit.
Although if what LeviTX posts as the "spec" for the inside of the rear pin area than both parts are WAY off, but I find it hard to believe that both parts would be .05 off from the spec.
ETA: before you blame Aero do you have other uppers you can check? Or other lowers? I never thought Aero turned out junk, but I would be more suspect of the lower since I personally have never heard of Delaware Machine.
Last edited by rjacobs; 02-13-13 at 12:59.
Last edited by C4IGrant; 02-13-13 at 13:17.
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