The upper was Day 1 of the Sig Days a few weeks ago.
Then the lower to match.
https://www.sigsauer.com/store/uppe...in-blk-elite-kit-less-bolt-carrier-group.html
https://www.deguns.net/sig-sauer-stripped-lower-LWR-M400-516-STRIPPED-p/lwr-m400-516-stripped.htm
Then the lower to match.
https://www.sigsauer.com/store/uppe...in-blk-elite-kit-less-bolt-carrier-group.html
https://www.deguns.net/sig-sauer-stripped-lower-LWR-M400-516-STRIPPED-p/lwr-m400-516-stripped.htm