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M44S and SM 4 Rail Handguard Hi_Res.mov - http://fotar15.com/m44s-and-sm-4-rail-handguard-hi_res-mov/

Mega Arms billet receivers with Daniel Defense MK18 rail, Trijicon optic, Magpul furniture, and Rainier Arms Raptor Charging Handle. This upper was custom built by the guys at Rainier Arms. Photo by Stickman.

Seekins precision AR with Leupold 1-4x optic, Keymod rail, Blueforce gear sling, IR laser, Mission First Tactical Battle Link stock and grip, and Lance FDE mag.

UTG 4/15 AR 15 Quad Rail - http://fotar15.com/utg-415-ar-15-quad-rail/

Palmetto State Armory AR-15: Extractor upgrade and quad rail - http://fotar15.com/palmetto-state-armory-ar-15-extractor-upgrade-and-quad-rail/

ZeroBravo RHS and VG6 Precision C.A.G.E outfitted on the Primary Weapons Systems FSC556, and Geissele MK8 M-LOK rail. Photo by Johnny Danger Photography

AR-15 18" SS Barrel and JP Free-Float Rail Install: 3-gun Rifle Build [PART 4] - YouTube