Quoted from a different thread....
They are frankengun home builds. Top one is mine, bottom belongs to the missus

Mine has had a few upgrades since this photo was taken but the parts list for both are....
Top rifle: 20"DMR build. 20" Krieger heavy weight barrel 5.56 chamber,fluted, threaded, target crowned, YHM Phantom muzzle break, YHM flip front sight, YHM 12" quad rail handguard ( free float), Upper is a American Spirit Arms, Lower is a Firebird Precision, Mil-spec M-16 bolt carrier, LMT upgraded bolt, Spikes Tactical T2 heavy buffer, Mil-Spec FCG (Standard trigger and hammer that have been honed and stoned to a 4.5# pull weight), CAA HK style foregrip, CAA Upgraded carbine stock, bubba rigged 120 lumen light, MagPul MOE pistol grip( new addition after photo), Harris Bipod ( new addition), Millet DMS-1 Optic(new addition), MI rear sight, Tridjicon front sight, MagPul 20rnd Pmag.
OAL with stock in my preferred setting is 38", weight is 13lbs 9oz.
This rig is accurate ( .5 MOA or less depending on load, climate conditions, and shooters skill level) out to a maximum of 400-500yds. At 100yds it can print 5 shot groups into one ragged cluster smaller than a dime. It recoils like a BB gun due to its extreme ( for a AR) weight.
..............................................................................................................................................................................................................Bottom 16" M-4 build BCM M-4 upper with a 16" Krieger mid weight barrel W/ M-4 cut on it, standard front sight tower with a rail adapter and a barska light, Trijicon front sight, YHM Phanton Muzzle brake, Plum Crazy Lower, Mil-spec M-16 bolt carrier, LMT upgraded bolt, Spikes Tactical T2 heavy buffer, Mil-Spec FCG (Standard trigger and hammer that have been honed and stoned to a 4.5# pull weight), Ergo grip pistol grip, standard handguards with a YHM rail adapter, MagPul MOE fore grip, CAA stock saddle and a M-203 recoil pad, Bushnell ACOG clone red dot sight, MI rear sight.
OAL is around 30-33" depending on what the missus wants it at, weight is 5lbs 8ozs.
This rig has more recoil and is not as accurate at range, but it is very fast on target, pleasant to carry, and real easy to maneuver in and around vehicles and buildings. Accuracy is 1 MOA.
This is one reason I love my job, it lets me build and tinker with my guns until I find the "Ideal" rifles for myself and my family.