LMT MRP 5.56 Chrome lined Piston AR-15 Barrel - 12" - Contract Overrun

Manufactured by Lewis Machine & Tool
Manufactured by Lewis Machine & Tool
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The MRP Gen 2 5.56mm Chrome Lined Piston Barrel by Lewis Machine and Tool Company is a versatile and durable barrel. It boasts a piston operating rod and is adjustable for regular or suppressed operation providing a great deal of utility for one barrel. The LMT MRP barrel offers a flash hider to help mitigate muzzle flash. The barrel is coated and cryogenically treated for long term durability. It features a 41V50 chrome moly vanadium steel chrome construction and is chrome lined for a high-degree of reliability and accuracy.


  • Contract Overrun
  • 5.56mm
  • 12-inch barrel
  • 41V50 chrome moly vanadium steel barrel, chrome lined
  • 1:7” RH twist barrel
  • For LMT monolithic receiver
  • Cryogenically treated for maximum durability
  • Adjustable gas piston block for regular or suppressed operation

Additionally, the cryogenic treatment further enhances the strength and service life of this barrel. In short, the LMT MRP Gen 2 Chrome Lined Piston Barrel offers the durability-enhancing features that one would expect from a high-grade carbine. LMT’s unrivaled reputation for accuracy and durability are on display with this barrel, a barrel that can withstand heavy use and abuse of any environment. The LMT 5.56mm piston barrel is a quality upgrade to any rifle and a great component for any AR build by providing unmatched durability, reliability and accuracy.

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Barrel CoatingManganese Phosphate
Barrel Length12
Barrel LiningChrome
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandLewis Machine & Tool
Caliber Gauge5.56 NATO
Feed RampsM4
Gas System LengthPistol
Thread Pattern1/2 X 28
Twist Rate1:7
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to www.P65Warnings.ca.gov.

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