GC_UPC Colt M4 Carbine .223 16.1 in Bbl Geissele 13 inMk4 Rail 30-Shot LE6920-FBP $1,527.75 LE6920-FBP show more like this Flat Rate Starting at $11.99 Hinterland Outfitters GC_UPC Colt Defense LE6920-FBP M4 Carbine .223 16.1" Barrel Geissele 13"MK4 Rail 30-SHOT $1,570.65 LE6920-FBP show more like this Calculated in Cart Classic Firearms GC_UPC Colt Mfg Le6920fbp2 M4 Carbine Federal Patrol 5.56X45mm Nato 30+1 16.10", Black, Geissele Mk4 M-Lok Handgaurd, Magpul Ctr Stock & Mbus Pro Sights, A2 Grip $1,680.23 LE6920FBP2 show more like this Firearms $18.45, Free over $500 Shooting Surplus