Armitage AR-15 type lower

[specweldtom]

I have a chance to pick up one of these, but don't know anything about it. It's machined from billet, in the white, and marked ARMITAGE INT'L, LTD. SENECA, SC USA BR-15-A65 on rt side and DIAMOND SERIES on left side.

I searched Armitage but didn't find anything on it.

Any info appreciated.

Thanks, Tom