Outer Barrels

Want to use an AirTac CRBN Upper on your Monk Customs Lower? Look no further! CRBN Uppers are a sleek way to turn any Monk Customs build into a lig...

The new Limited Edition Extreme Airsoft & AirTac Customs AEG CRBN Upper receiver is made with genuine carbon fiber for strength and fits over A...

The new Limited Edition Extreme Airsoft & AirTac Customs HPA CRBN Uppers are a sleek way to turn any build into a lightweight beast, made with ...

Lightweight barrel made of CNC aluminum and genuine carbon fiber. As featured on the Heretic Labs Article I. Available in 3.5″ and 6″ lengths. Incl...

Features Precision CNC machined aluminum alloy construction Weather resistant matte black finish 14mm negative threads for attaching muzzle device...

Features Precision CNC machined aluminum alloy construction Weather resistant matte black finish 14mm negative threads for attaching muzzle device...

Features Ultra lightweight carbon fiber barrel construction Durable aluminum alloy thread sections Common 14mm counter clockwise (negative) thread...

Features Precise and durable CNC aluminum construction TDC (Top Dead Center) Enables hop-up adjustments from the topside screw without the disasse...

This outer threaded barrel and screw-on cap provide an additional level of aesthetic flare to the CZ P-10 C. Both the barrel and cap are made of du...

This is Monk's latest addition to the world of M4 Outer Barrels. The unique and stylish twisted helix design stands out beautifully, especially whe...

Introducing the ALU Tube AEG Uppers - a new anodized style! We wanted to mix up our CRBN uppers in a crazy way - removing the carbon fiber entirely...

Introducing the ALU Tube HPA Uppers - a new anodized style! We wanted to mix up our CRBN uppers in a crazy way - removing the carbon fiber entirely...

Features Heavy duty aluminum alloy construction Weather resistant matte finish One piece design 14mm negative threaded barrel, compatible with sta...

The LA Innovations 155mm Aluminum Outer Barrel, designed specifically for the LA Innovations upper. This is an optional add on that allows you to h...

Features Direct drop-in replacement Aluminum construction Counter-clockwise thread pitch

The Monk outer barrels are build for super lightweight set-ups! This outer barrel is compatible with the M4 series.