Quoted: Out of two DPMS cast lowers I've used, one was out of spec.
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Same thing happenned to a buddy.
He bought two Olympic arms cast lowers, the first one we tried building on was out of spec.
The trigger assy wouldn't work correctly.
The second one was fine and was perfect with the same internals.
He built it up later again but it took a little fiddling to get things working as they should.
Edited to add:
Not a bust on OlyArms, everything else I have bought from them has worked great. The reason that was suggested (not by OlyArms) for the out of spec holes was that the jig being used when drilling required each side to be drilled then the rec was flipped over in the jig to drill the other side.