COWCOW OB1 5.1 Stainless-Steel Threaded Outer Barrel – .45 Marking 

Competition-Grade Construction: Precision-CNC machined from solid stainless steel, the OB1 5.1 outer barrel adds welcome heft, boosting slide momentum for a snappier recoil pulse while drastically improving long-term wear resistance compared with stock alloy barrels.

Titanium-Nitride Protective Finish: Each color option is achieved through a TiN-based physical-vapor-deposition (PVD) process—widely used on real-steel race guns for its extreme scratch and abrasion resistance. Choose Raw Silver (bare stainless), Titanium Black, Titanium Gold, or Rainbow for a distinctive match-grade look that won’t flake or dull under hard use.

Fixed-Barrel Stability & Threaded Versatility: The barrel’s fixed design reduces muzzle wiggle during cycling, tightening shot-to-shot consistency. Internal 11 mm CW threads accept popular tracers, mock suppressors, and M11 adapters right out of the box, expanding your build options without extra parts.

Broad TM-Spec Compatibility: Dimensioned for Tokyo Marui Hi-Capa 5.1 slides and frames, the OB1 also fits most TM-spec clones from WE-Tech, KJW, and Army Armament. In typical builds it installs as a true drop-in; minor hand-fitting may be required on heavily modified pistols.

Gunsmith-Level Quality Control: Tight inner-bore clearance (≈ 8.6 mm) accepts standard and aftermarket inner barrels while maintaining concentricity. As with all precision parts, proper lubrication and routine maintenance will maximize service life.

Features

• CNC-machined stainless-steel body for durability and added recoil mass
• Real-steel-style TiN PVD finish in four colorways
• 11 mm CW internal threading (tracer / suppressor ready) & M11 adapter compatible
• .45 ACP roll-marked for authentic aesthetics
• Drop-in for TM Hi-Capa 5.1; fits most TM-spec clones (minor fitting may be needed)

Specifications

Weight: ~110 g 
Material: CNC Stainless Steel
Color / Finish: Raw Silver, Titanium Black, Titanium Gold, Rainbow (TiN PVD)
Threading: 11 mm CW Internal
Compatibility: TM Hi-Capa 5.1 GBB & TM-spec clones (WE, KJW, AA, etc.)
Markings: .45 ACP (laser-engraved)
Package Includes: Outer Barrel Only

Installation note: Intermediate tech skills recommended. Always test-fit and cycle by hand before live firing; consult a qualified airsoft gunsmith if additional fitting is required.