Griffin Armament 3-Lug — 9mm Luger, M13.5x1 LH tpi — 17-4 Stainless Steel, Black Melonite / QPQ | 3L1351LH (UPC 791154082072)
Upgrade the muzzle interface on your 9mm pistol or carbine with the Griffin Armament 3-Lug 3L1351LH — a precision 3-lug taper mount machined from premium 17-4 stainless steel and finished in durable Black Melonite / QPQ. Built for repeatable concentricity, rock-solid lockup, and long service life, this left-hand threaded M13.5x1 LH mount is engineered to protect your suppressor, preserve accuracy, and deliver consistent performance shot after shot.
Precision Engineering for Suppressor Reliability
When mounting quick-attach style suppressors or muzzle devices, concentric alignment and repeatable lockup are essential. The Griffin Armament 3-Lug (3L1351LH) solves common muzzle attachment problems by providing:
Tight bore-to-mount concentricity to minimize baffle strikes.
Consistent, repeatable lockup for predictable point-of-impact retention.
A robust 17-4 stainless steel body that resists deformation under repeated use.
A Black Melonite / QPQ surface treatment for increased wear resistance, corrosion protection, and reduced glare.
This mount is purpose-built for 9mm platform suppressor systems that utilize an M13.5x1 left-hand thread pitch, and it’s ideal for owners who demand OEM-level fit, finish, and longevity.
Key Features & Specifications
Model: Griffin Armament 3-Lug Mount — 3L1351LH
Caliber: 9mm Luger (confirm compatibility with your host and suppressor)
Threading: M13.5 x 1, Left-Hand (LH) — standard metric 9mm suppressor thread in many platforms
Material: 17-4 stainless steel (high-strength, corrosion resistant)
Finish: Black Melonite / QPQ — hardened, low-glare surface treatment
Design: 3-lug taper mount geometry for quick attach/detach and secure engagement
Intended Use: Quick-attach suppressor systems and muzzle devices requiring a 3-lug taper mount
Part #: 3L1351LH
UPC: 791154082072
Benefits You’ll Notice
Repeatable Accuracy: Tight tolerances reduce bore offset so your suppressor won’t alter POI between installs.
Extended Suppressor Life: Proper concentric lockup reduces the risk of baffle contact that can damage cans.
Rugged Durability: 17-4 stainless steel core and QPQ finish stand up to frequent attachment cycles and adverse environments.
Low Profile: Compact design keeps overall length minimal while maintaining reliable engagement.
Professional Fit & Finish: Machining and finish quality match high-end suppressor systems for a seamless on-gun appearance.
Compatibility & Fitment Notes
This 3-lug mount uses M13.5x1 LH threads; verify your barrel’s thread pitch and shoulder geometry before ordering.
Designed to mate with suppressors and muzzle devices that accept a 3-lug taper mount. Not all quick-attach systems use the same shoulder length—confirm specifications for your suppressor model.
If your firearm originally shipped with a different thread pitch (e.g., 1/2-28, M14x1, etc.), do not attempt to force fit—use the correct mount for your threading.
Installation & Best Practices
Verify Threads: Confirm M13.5x1 LH on your barrel. Left-hand threads tighten counterclockwise — be mindful when hand-starting.
Hand-Start First: Thread the mount on by hand to prevent cross-threading before using tools.
Torque to Spec: Use manufacturer recommended torque values or a properly sized wrench on flats—avoid over-torquing.
Check Concentricity: After installation, inspect bore concentricity and verify suppressor clearance before live firing.
Initial Proofing: Fire a short proof string, then re-check for looseness, baffle strikes, or abnormal contact.
Use Recommended Retention: Employ any locking collars, crush washers, or thread-locking solutions as directed by your suppressor manufacturer.
Maintenance & Care
Wipe mating surfaces clean of carbon and debris after use.
Use a soft brush to remove fouling from threads; avoid harsh abrasives that could damage finishes.
Lightly lubricate threads for storage to prevent corrosion; avoid oils that attract dust.
Inspect regularly for thread wear, nicks, or deformation—replace the mount if damage is detected.
Safety & Legal Reminder
Muzzle devices and suppressor mounts may be subject to local, state, and federal regulation. Confirm legal compliance before purchasing or installing this 3-lug mount. Always practice safe firearm handling—install and remove muzzle components with the firearm unloaded and follow all manufacturer safety instructions.
Why Choose Griffin Armament
Griffin Armament is widely respected for engineering high-precision suppressor components and mount systems. The 3L1351LH 3-lug mount continues that reputation by combining meticulous machining, premium metallurgy, and hardened surface treatments into a compact component that protects your suppressor investment and improves on-gun reliability.
If you need repeatable lockup, durable materials, and a professional finish for your M13.5x1 LH 9mm setup, the Griffin Armament 3-Lug 3L1351LH is a smart, performance-driven choice.
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