LMT Defense - AR-15 Barrel 8.25" 300 Blackout - L7BX1B - Boss Firearms - BossFirearms.com

LMT Defense - AR-15 Barrel 8.25" 300 Blackout - L7BX1B

LMT Defense
SKU:
L7BX1B
$554.40
$598.00
(You save $43.60 )
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Description

The LMT Defense AR-15 8.25" .300 Blackout MRP-L Barrel (L7BX1B) is LMT's most compact .300 Blackout barrel assembly, designed for ultra-short SBR, AR pistol, and suppressed builds on the LMT MRP-L upper receiver platform. At just 8.25", this barrel is optimized for .300 BLK performance in a PDW-sized package, offering excellent ballistics with both supersonic and subsonic .300 BLK ammunition. The pistol-length gas system is ideally tuned for use with suppressed and unsuppressed configurations. Machined from mil-spec chromoly steel with LMT's precision rifling at a 1:7" twist rate to stabilize the full range of .300 BLK projectiles.

  • Part Number: L7BX1B
  • Platform: LMT MRP-L (AR-15 light upper receivers)
  • Caliber: .300 Blackout (.300 BLK / 300 AAC Blackout)
  • Barrel Length: 8.25"
  • Rifling Twist Rate: 1:7" RH
  • Barrel Material: Chromoly steel
  • Gas System: Pistol-length
  • Operating Method: Direct impingement
  • Compatibility: LMT MRP-L upper receiver chassis (L7NX1A 7.25" chassis recommended)
  • Muzzle Threading: 5/8x24 TPI (standard .30 cal thread pitch)
  • Manufacturer: Lewis Machine & Tool (LMT Defense), Milan, Illinois, USA

Ideal for suppressed .300 BLK builds, AR pistols, or PDW-style SBRs. Compatible with standard .308/7.62 bolt face AR-15 bolt carrier groups. Barrel only — BCG and upper receiver sold separately. This product may require an SBR/NFA tax stamp depending on your intended configuration. Consult applicable federal and state regulations.