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Lmt Defense
The LMT Monolithic 300 AAC Blackout 10.5" barrel is a purpose-built upper receiver component engineered for shooters running LMT monolithic platform rifles who want a compact, high-performance setup for 300 Blackout. This pistol-length barrel puts serious capability in a short package—ideal for CQB training, suppressed shooting, or building a maneuverable tactical rifle without sacrificing reliability. The 1:7" right-hand twist rifling is optimized to stabilize both subsonic and supersonic 300 Blackout ammunition, making it versatile for your mission set.
Built from chromoly steel and chrome-lined for corrosion resistance and service life, this barrel integrates with LMT's direct impingement system using a low-profile gas block and straight gas tube. The A2 birdcage flash hider keeps muzzle signature down and controls recoil impulse. The entire assembly receives cryogenic treatment to enhance durability and reliability—a hallmark of LMT's build quality. If you're serious about 300 Blackout and demand precision-matched components, this barrel works best as part of a complete LMT monolithic upper.
The 10.5" length strikes a balance between velocity and handling. You'll retain enough barrel to wring solid performance from both subsonic and standard loads, while keeping your overall rifle length compact for close-quarters work or vehicle storage. Whether you're running this with a suppressor or shooting it unsuppressed, the design is dialed in for LMT hosts.
| Caliber | 300 AAC Blackout |
| Barrel Length | 10.5" |
| Barrel Material | Chromoly Steel |
| Rifling Twist Rate | 1:7" RH |
| Bore Finish | Chrome-lined |
| Platform Compatibility | LMT Monolithic Receiver |
| Operating System | Direct Impingement |
| Muzzle Device | A2 Birdcage |
| Gas System | Pistol-length |
This barrel is designed specifically for the LMT monolithic receiver system. It integrates with LMT's direct impingement layout and requires LMT-pattern components for proper function. It is not a drop-in fit for standard AR-15 platforms.
The 1:7" right-hand twist is optimized for 300 AAC Blackout and will stabilize both subsonic and supersonic loads reliably. This makes it versatile whether you're running heavy subsonic rounds or faster supersonic ammunition.
Yes. The bore is chrome-lined for improved corrosion resistance and durability, especially beneficial for shooters running suppressors or shooting in variable conditions.
The barrel integrates with LMT's low-profile gas block and straight gas tube design. Confirm compatibility with your specific upper assembly or consult LMT documentation for assembly details.
Lmt Defense
The LMT Monolithic 300 AAC Blackout 10.5" barrel is a purpose-built upper receiver component engineered for shooters running LMT monolithic platform rifles who want a compact, high-performance setup for 300 Blackout. This pistol-length barrel puts serious capability in a short package—ideal for CQB training, suppressed shooting, or building a maneuverable tactical rifle without sacrificing reliability. The 1:7" right-hand twist rifling is optimized to stabilize both subsonic and supersonic 300 Blackout ammunition, making it versatile for your mission set.
Built from chromoly steel and chrome-lined for corrosion resistance and service life, this barrel integrates with LMT's direct impingement system using a low-profile gas block and straight gas tube. The A2 birdcage flash hider keeps muzzle signature down and controls recoil impulse. The entire assembly receives cryogenic treatment to enhance durability and reliability—a hallmark of LMT's build quality. If you're serious about 300 Blackout and demand precision-matched components, this barrel works best as part of a complete LMT monolithic upper.
The 10.5" length strikes a balance between velocity and handling. You'll retain enough barrel to wring solid performance from both subsonic and standard loads, while keeping your overall rifle length compact for close-quarters work or vehicle storage. Whether you're running this with a suppressor or shooting it unsuppressed, the design is dialed in for LMT hosts.
| Caliber | 300 AAC Blackout |
| Barrel Length | 10.5" |
| Barrel Material | Chromoly Steel |
| Rifling Twist Rate | 1:7" RH |
| Bore Finish | Chrome-lined |
| Platform Compatibility | LMT Monolithic Receiver |
| Operating System | Direct Impingement |
| Muzzle Device | A2 Birdcage |
| Gas System | Pistol-length |
This barrel is designed specifically for the LMT monolithic receiver system. It integrates with LMT's direct impingement layout and requires LMT-pattern components for proper function. It is not a drop-in fit for standard AR-15 platforms.
The 1:7" right-hand twist is optimized for 300 AAC Blackout and will stabilize both subsonic and supersonic loads reliably. This makes it versatile whether you're running heavy subsonic rounds or faster supersonic ammunition.
Yes. The bore is chrome-lined for improved corrosion resistance and durability, especially beneficial for shooters running suppressors or shooting in variable conditions.
The barrel integrates with LMT's low-profile gas block and straight gas tube design. Confirm compatibility with your specific upper assembly or consult LMT documentation for assembly details.
