Quoted: 16" M4 1:7 or 1:8 twist NON chrome lined in black.. rifle or M4 feed ramped.
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That's such an odd request, I breezed over that little detail as well. Lilja made some M4 barrels for the military and had an overrun sale. Pricey too, though and they may not come in black.
Lilja M4 Barrel__________________________________________________________________________________________________________________________________________
From the Lilja website:
Production Overrun: AR-type barrels.
After filling a military M-4 contract we have the following as extras. These barrels are perfect for rebarreling that AR with a short barrel, just screw on a barrel extension, crown and drill a gas port hole. They also require the short gas tube and a .750" diameter gas block. They are .224" caliber, have an 8" twist and 3-grooves and have been cryogenically treated. The overall length is 16.5", they are .980" dia. for 2.60" with a radius dropping down to .850" dia. and then .725" dia. out to the muzzle with a .750" dia. section for a gas block. These barrels are stainless steel, chambered for the .223 cartridge, threaded .812" - 16 TPI and also threaded .500" - 28 TPI at the muzzle.
We have reports of 1 MOA accuracy out to 600 yards in desert conditions.
Price: $325 each (just one left and at 2004 pricing)Edited to add: These are not drop in barrels, they need work, like extension installation and gas port drilling/reaming.