Description
ASG Ultimate Cylinder Inner Barrel Length 301-400mm for Airsoft AEGs
Boost your AEG’s compression efficiency and upgrade your internals with the ASG Ultimate Cylinder, specifically designed for inner barrel lengths between 301mm and 400mm. Part of the renowned ULTIMATE® Upgrade Series by ActionSportGames, this CNC-machined cylinder is crafted to deliver superior performance in custom airsoft builds. Whether you're working on a high-speed CQB setup or a mid-range assault rifle, this component ensures consistent air delivery, matched precisely to your barrel length.
Constructed from 45C cold drawn seamless steel, the cylinder offers exceptional strength and tight tolerances that drastically reduce deformation risks during installation. The inner surface remains perfectly round and smooth thanks to cold hardening and ultrasonic cleaning processes, while the outer shell features CNC-lathed grooves for increased heat dissipation. A durable Isonite oxide finish not only prevents corrosion but also reduces friction to maximise longevity and reliability — even under extreme use. With milled air vents and ASG’s signature logo for easy identification, this upgrade part is a go-to choice for airsoft techs seeking ultimate control and performance.
Highlights
- Built from 45C cold drawn seamless steel for high durability
- Precision CNC-lathed outer grooves improve cooling
- Cold hardened with Rockwell hardness of 20-25
- Isonite oxide surface treatment for reduced friction and corrosion resistance
- Optimised for inner barrel lengths between 301-400mm
- Milled air vents with ASG signature for easy tech recognition
- Ultrasonically cleaned for ultra-smooth interior
- Perfect fit for high-performance AEG builds
What's Included
- ASG Ultimate CNC Cylinder
- Protective packaging
- Installation guidelines (if applicable)
- ASG branding and part ID
Technical Specifications
- Material: 45C cold drawn seamless steel
- Surface Finish: Isonite oxide (black)
- Compatible Barrel Length: 301–400mm
- Weight: 34g (0.0749 lb)
- Outer Surface: CNC-lathed grooved texture
Product Reviews
Delivery & Returns
Delivery Information
Affordable Shipping – Starting from Just £2.50
Our delivery prices begin at only £2.50 for UK mainland orders, with free standard delivery available on all orders over £100*. To quickly find out the exact shipping cost for your items, simply add everything to your basket. In the basket, you'll see a link under the subtotal titled "Estimate Shipping & Tax"—click this, enter your delivery details, and you’ll get a full quote including whether you qualify for free shipping.
Free Shipping Offers
- UK Mainland: Free on orders over £100*
- Northern Ireland, Republic of Ireland, Scottish Highlands & Islands, and Isle of Man: Free on orders over £100*
- Channel Islands: Unfortunately, we do not offer free shipping to this region
*Free shipping is a 5 working day service. For example, an order placed on Monday would typically arrive the following Monday.
Mainland UK Delivery Options
- Royal Mail: From £2.50 (2 working days, price based on weight)
- Economy Delivery: £4.95 flat rate (2–4 working days)
- Express Delivery: £6.95 flat rate (1–2 working days)
Working days exclude Saturdays, Sundays, and public holidays. Need your order on a Saturday? We can arrange this for £20—please contact us directly after placing your order to pay the balance.
Delivery Prices – Outside Mainland UK
- Northern Ireland: From £5.95
- Scottish Highlands & Islands: From £5.95
- Isle of Man: From £5.95
- Republic of Ireland: £6.95 flat rate (any size order)
- Channel Islands: £7.95 flat rate (any size order)
We strive to keep our delivery charges as fair and straightforward as possible, with clear options to suit all needs and budgets.
