One Horse LLC 16-inch M4 Contour Barrel, Carbine-Length Gas, 5.56 NATO

The One Horse LLC 16-inch Barrel (brand part no. OHBR01) is chambered in 5.56 NATO with a 1-in-7 twist rate and a carbine-length gas system, running the M4 contour that most AR-15 handguards and gas blocks are already sized for. At 16 inches, it’s a standard direct-swap barrel with no special barrel-length paperwork.

Key Specifications

• Measures 16 inches long, clearing the federal minimum rifle barrel length.
• Chambered in 5.56×45 NATO.
• Uses a 1-in-7 twist rate, suited to a wide range of 5.56/.223 bullet weights, including heavier ones.
• Runs a carbine-length gas system, matching standard AR-15 timing.
• Carries the M4 contour, the most common AR-15 barrel profile for handguard and gas block fitment.

Frequently Asked Questions

Is this barrel legal without any special paperwork? Yes, at 16 inches it clears the federal minimum rifle barrel length, so no NFA registration is required.

What gas system does this barrel use? A carbine-length gas system, matching the timing most standard AR-15 lowers and bolt carrier groups are built around.

Will standard M4-contour handguards fit this barrel? Yes, it carries the M4 contour, the same profile most AR-15 handguards and gas blocks are sized for.

Buy the One Horse 16-inch M4 Contour Barrel, 5.56 NATO

Order the One Horse LLC 16-inch Barrel through our One Horse LLC lineup at Schaefer Defense and we will ship it fast, fully insured, from our Lubbock, TX gun shop, along with more rifle parts.