Description
A 14.5″ SOLGW barrel in 6mm ARC, 416 stainless with a 1:8 twist, converted to the LMT® MRP™ barrel interface. 6mm ARC puts a high-BC six-millimeter projectile in an AR-15-sized receiver, and this length suits a handy carbine under an MRP-L handguard.
The RIFLESPEED Gas Control is installed and pinned before shipment — twelve numbered positions with a tactile click, adjusted by hand without tools and without pulling the handguard. Fitted and tuned with the #887 plunger, optimized for 6mm ARC, with the standard #917 plunger included so the gas system can be configured further by the shooter. The plunger and setting are recorded on the barrel inspection record.
6mm ARC runs the 6.5 Grendel case head, not the 5.56 bolt face, so this barrel needs a Grendel-pattern bolt — the bolt changes, the carrier does not. A matched bolt group can be added and gauged to this barrel.
Converted to the LMT® MRP™ barrel interface, then inspected, gauged and assembled by the Second of Ten build team to a documented standard. Installs with the MRP™ upper’s factory barrel hardware — no proprietary tooling and no permanent modification to the receiver. Headspace is gauged and recorded on the barrel inspection record before shipment.
Ships shooter ready: gas tube installed and the muzzle protected by the SOT Standard Barrel Thread Protector (CNC-machined steel, black or nitride finish), with no muzzle device fitted. We carry muzzle devices from a number of manufacturers and can install and time them for you — for a specific muzzle device, please ask before ordering.
Includes
- 14.5″ SOLGW barrel, converted to the LMT® MRP™ interface
- RIFLESPEED Gas Control, installed, aligned, torqued and pinned
- #887 plunger installed and tuned, optimized for 6mm ARC
- #917 plunger, loose in the box
- RIFLESPEED mid-length straight gas tube, installed
- SOT Standard Barrel Thread Protector, fitted (CNC-machined steel, black or nitride finish)
- Vacuum-sealed, with a Zerust® corrosion-inhibitor tube in the bore (remove before firing)
- Barrel inspection record (SOT-BIR-001)
Options
- Headspaced bolt group: NP3 carrier with Type II dual-ejector bolt
- Headspaced bolt group: NP3 carrier with Young Manufacturing 6mm ARC Black Nitride HMB™
- Headspaced bolt group: Microbest Super-Stake with Young Manufacturing 6mm ARC Chrome HMB™
- Muzzle devices from other manufacturers, installed and timed — for a specific muzzle device, please ask before ordering
Matching headspaced bolt
Choose a bolt above and we gauge headspace with it in this barrel and record the pairing on the barrel inspection record, so the two ship as a matched set.
Full specifications, photos and the inspection standard
Shipping: we do not ship barrel assemblies to CA, CT, DE, DC, HI, IL, MD, MA, NJ, NY, RI or WA, or to Denver, CO or Cook County/Chicago, IL. Questions? Ask your local FFL.
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
