I just finished this tonight. Some of you probably saw the upper in Grant's MUR build thread. I added the last few parts to the upper & just finished the lower that will be it's new home. Only thing left to do is mount an optic.

On a side note, one thing I noticed immediately is how well the MUR finish matched my RRA lower, but also how well it fit. It is tight but has no slop & attaches much easier than my Sabre upper which is very tight. The DD Lite rails are very nice too.

Specs:
RRA Lower w/ 2 stage NM trigger
Vltor receiver extension
Magpul CTR stock
Vltor ambi receiver plate w/ HK sling loop
Magpul trigger guard
Tangodown Battlegrip

Upper build by G & R
Vltor MUR
Noveske 16" Recon 1/7 midlength bbl
KG coat black
DD 9.0 Lite rail
Vltor gas block
Young NM carrier
CMT MP tested bolt
Vortex FH
Std. CH w/ PRI big Latch
Troy Industries BUIS set