I've posted others on here I'm sure so I'll just do the ones I don't think were around then.
Most recent DMR AR build. Bedded Krieger bbl.'d, URX4, SSA/E, FMOS BCG, Saker can, Mk4 2.5-8x. This thing is amazingly accurate and soft shooting too with the mid length gas:
Had it awhile, just don't think I took pics. 11.5" Noveske bbl., URX2, Geissele single stage, FMOS BCG, AAC 556SD. A 1MOA SBR.
This one got given away to a member on here in more or less the same configuration. Well, we all pitched in parts and I donated the barrel and other parts and they bought the handguard. Turned out to be a fine shooter too and couldn't have gone to a better guy. Do good shit and karma will reward you with new rifles and parts (sometimes).
The simplicity of this one is the most attractive feature. At about 21" in .300BLK, it's a pretty damn fine PDW to have been created almost entirely out of extra parts laying around. Always goes bang, supers or subs, can or not.