Colt M4A1 SOCOM Carbine 5.56 NATO Matte Black AR-15 Semi Auto Rifle

A: According to Colts UPC code it has a 16.1" Chrome Lined M4 SOCOM style Barrel. You may be best served before you commit to buying to contact Colt with the UPC to verify it's what you expect. Since Buds does not open new firearm boxes, Colts contact number is: Tel: 800-962-COLT (2658) * Mon-Fri 9am to 5pm EST

A: Barrel Length (in.): 16.1" Bore Chrome Lined, 6 Grooves, 1-7" RH Twist

A: INB4 Double Tap. More than likely, the barrel Colt is using is "similar" to the real SOCOM barrel, but no cigar. Google search shows that the barrel for this product is just as thick as the real SOCOM barrel minus the cuts for the M203 attachment and shares the same profile as a M4 contour after the front sight post, which again are for the M203 grenade launcher. Me personally, I'd buy the weapon if I had money burning a hole in my pocket and basically is the "civilian" legal version to the actual rifle, minus giggle switch, a 16.1" barrel, and Colt named product. To answer your question about the handguards, the description of the product states that the rails are Troy products drop-in handguards, so no on the Knight's Armament Rails. Probably there to cut down on cost, but hey you do get the Matech rear sight.