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- ASG Ultimate M135 Upgrade Airsoft Spring - Red
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ASG Ultimate M135 Upgrade Airsoft Spring - Red
Key Features
- Made from military-grade SiCr spring steel
- Progressive coiling for smoother gear cycling
- Closed and ground ends for maximum stability
- Pre-compressed to reduce shrinkage and maintain power
- Black zinc coating for corrosion resistance
- Red colour-coded tip for easy identification (M135 grade)
Built for power, designed for consistency — the M135 spring that won’t let up.
Description.
If you're pushing your AEG beyond stock and want that punchy performance without sacrificing reliability, the ASG Ultimate M135 Upgrade Spring is a serious contender. Crafted from SiCr — a high-tensile, military-grade spring steel — this upgrade spring is designed to maintain consistent compression and deliver rock-solid shot-to-shot power. And thanks to its red colour-coded end, there’s no guessing games when it’s time to tune your gearbox or check your loadout’s compliance.
This spring falls in the M135 category, giving your AEG the muscle to push BBs above the 1.7J–1.9J range (depending on barrel length, seal quality, and other internals), ideal for designated marksman rifle (DMR) builds or field setups requiring that extra bit of range and velocity. But don’t let the power fool you — the progressive coil design means it compresses smoothly, putting less strain on your gearbox and improving the overall cycle flow. It’s a small detail that makes a big difference in long-term durability, especially when you're running semi-auto-heavy or high-torque setups.
Pre-compression during manufacturing also helps preserve its strength, so you don’t lose FPS due to spring fatigue after just a few games. With closed and ground ends, it sits properly in spring guides and pistons without leaning or twisting — keeping everything aligned and efficient. Add in black zinc plating to fend off corrosion, and you’ve got a spring that’s as resilient as it is powerful. Whether you're building a full custom AEG or just upgrading a stock platform to dominate in outdoor skirmishes, the M135 is a dependable, no-compromise choice for airsofters who need consistent, top-tier performance under pressure.
Other Great Features are,
Minimal FPS drop over time thanks to pre-compression
Excellent fitment with most V2/V3 gearboxes
Supports higher-torque motor builds
Ideal for DMR-style airsoft rifles
In the box:
- ASG Ultimate M135 Upgrade Spring (Red tip)
- Product packaging
Specifications
Colour Tone: Red (M135)
Power Output: Typically >1.7J to Material: SiCr Spring Steel
Coating: Black zinc for corrosion resistance
Brand: ULTIMATE (by ASG)
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Sku :
18767Product Reviews
Delivery Prices start from just £2.50 with free delivery on orders over £75 To the uk mainland *.
Tip - The easiest way to check the shipping cost for what you want to buy is put all of the stuff you want in to your basket. Then in your basket under the sub total there is a link for “Estimate Shipping & Tax” click this and fill in the details and it will tell you the shipping cost and if you qualify for free shipping
Free Shipping
Free shipping on orders over £75 To UK Mainland (excluding some parts of scotland)
Free shipping on orders over £100 To Northern Ireland & the Republic of ireland, Scottish highlands & islands, and I.O.M
Sorry we do not offer free shipping to the Channel Islands
Free shipping is a 5 working day service* (if you order Monday you get it the next Monday)
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*) £4.95 Flat Rate
Express shipping (post as much as you want) (1 to 2 Days Delivery*) £5.95 Flat Rate
*Working days (Saturday and Sunday are classed as non working days)
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.
Delivery price (Ireland, Scottish Highlands & Islands)
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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