ATI Omni Hybrid Polymer AR-15 Receiver Set in Black, FDE, ODG

Can I order the upper separate. I have a FD / ODG lower from years back and just looking for the matching upper
 
{It also features a patented hammer and trigger pin retainment system, preventing movement from the hammer and trigger pin during firing.}

Will standard AR pins work ?

yes,
the plastic bumps out and is threaded to receive set screws (included) that can retain any standard pins. Here's a sketch from the patent.

L1FH9N.jpg
 
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