ASG Ultimate M135 Upgrade Airsoft AEG Spring - Red
If you’re upgrading your AEG for serious field use or DMR-style loadouts, the ASG Ultimate M135 Spring delivers a strong balance between power and durability. Designed to push performance into the 1.7J–1.9J range (dependent on setup), this spring is ideal for airsoft rifles that demand consistent high FPS. Manufactured from SiCr military-grade spring steel, it ensures long-lasting compression with minimal fatigue — a key feature for any semi-auto-heavy or high-torque configuration.
Its progressive coil design helps smooth out gear cycles and reduces stress on your gearbox, while closed and ground ends maintain proper alignment during operation. The red colour-coded tip makes it easy to identify the spring strength, and the black zinc coating provides solid corrosion resistance, especially during outdoor use. Pre-compression straight from the factory means you get reliable performance right out of the box — no excessive settling or power drop after just a few skirmishes.
Features
- Constructed from high-tensile SiCr spring steel
- M135 power level — approx. 1.7J–1.9J output
- Pre-compressed to reduce fatigue and maintain FPS
- Progressive coiling for smoother operation
- Closed and ground ends for improved stability
- Black zinc coating to resist rust and corrosion
- Red tip for fast identification
- Fits most V2/V3 AEG gearboxes
What you get
- ASG Ultimate M135 Upgrade Spring (Red tip)
- Protective product packaging
Details
- Colour: Red-coded (M135)
- Material: SiCr Military-grade spring steel
- Power Output: Typically >1.7J depending on build
- Coating: Black zinc plated
- Brand: ULTIMATE by ASG
SHIPPING Delivery Prices start from just £2.50 with free delivery on orders over £50 To the uk mainland *.
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Free ShippingFree shipping on orders over £50 To UK Mainland (excluding some parts of scotland)
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Delivery price (Mainland UK)Royal Mail (depending on weight) (2 Days Delivery*) From £2.50
Economy (post as much as you want) (2 to 4 Days Delivery*) £4.75 Flat Rate
Express shipping (post as much as you want) (1 to 2 Days Delivery*) £5.95 Flat Rate
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we can arrange a Saturday delivery on request but costs £20 and you will need to call us to pay the balance after making an order.
Northern Ireland From £ 5.95
Highlands and islands From £5.95
I.O.M From £5.95
Republic of Ireland £6.95 (Flat Rate how ever big or small your order is)
Channel Islands £ 7.95 (Flat Rate how ever big or small your order is)
Delivery price (International Tracked)
(Flat Rate how ever big or small your order is)
Republic of Ireland (IRL)---- £6.95 Price Drop WAS £16
Belgium (BE)--------------- £7.95 Price Drop WAS £15
Netherlands (NL)---------- £6.95 Price Drop WAS £15
Germany (DE)-------------- £6.95 Price Drop WAS £25
Luxembourg (LUX)--------- £9.95 - NEW
France (FR)----------------- £9.95 Price Drop WAS £25
Austria (AT)---------------- £11.95 - NEW
Greece (GR)---------------- £12.95 - NEW
Sweden (SE)-------------- £14.95 - NEW
Denmark (DK)------------ £9.95 Price Drop WAS £15
Finland (FI)--------------- £15.95 - NEW
Italy (IT)------------------ £11.95 Price Drop WAS £16
Portugal (PT)------------- £11.95 Price Drop WAS £18
Poland (PL)----------------- £9.95 - NEW
Spain (ES)----------------- £12.95 Price Drop WAS £23
Sweden (SE)-------------- £11.95 Price Drop WAS £15
Slovakia (SK)------------- £11.95 - NEW
Slovenia (SL) ------------ £11.95 - NEW
Croatia (HR)-------------- £16.95 - NEW
Czech Republic (CZ)----- £10.95 - NEW
Hungary (HU)------------ £10.95 - NEW
Bulgaria (BG)------------ £14.95 - NEW
Romania (RO)------------ £13.95 - NEW
Switzerland (CH)--------- £12.95 - NEW
Turkey (TR)--------------- £17.95 NEW
Channel Islands ----------£ 7.95 Price Drop WAS £15
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