- For Airsoft AEG
- Great Spare Part
- Wide Range of Powers
A replacement spring for your Airsoft AEG weapons.
Here at Patrol Base we ship worldwide, delivering not only to the UK but to most of the EU and select Worldwide locations as well. We provide a working day-by-road service via our handpicked courier services, simply buy your Airsoft guns with us and we'll have them delivered directly to your door.
For more information and to see the country we deliver please check out our Delivery Information Page.
Below are some rough postage prices for orders. Please note these are subject to change and are only a rough guide. For a more accurate postage estimate please use the Postage Calculator at the basket.
UK Next Day
Highlands / Islands
* Scottish Highlands, Islands, and EU post prices can vary wildly. Prices range from £8.99 to £29.99, so please ensure you refer to the Postage Calculator at the basket for the lowest possible price.
We want you to be delighted with our products and services, so we provide the simple Patrol Base guarantee: if on receiving your item you are unhappy with your item for any reason then simply send it back to us. We will replace or refund the item.
You can return any item for any reason whatsoever, even if you have just changed your mind, within 14 days of receipt of the order. This is in addition to your rights under the Consumer Protection (Distance Selling) Regulations 2000.
For more information on returning products, and how to do it please visit our Returns Policy Page.
The perfect spare springs for those who modify their weapons, or for those who have a weapon which is too hot to use and requires downgrading.
- A wide range of Springs, for various applications
- High Powered Springs for DMR and Dual Sector Gear Setups
- Low Powered Springs for CQB and low power AEG Setups
- Mid Power Springs for Gun Downgrades and Upgrades
- Tune-Up AEG Spring
The Springs approximate power can be shown by selecting a Spring Type from the top right of the screen which will update the Product Specification.
To work out the power of the spring you require please refer to the SP (Spring Power) Rating of the spring, this is the approximate power in M/s as defined by the manufacturer. Please note, that this can vary dependant on the setup of your gun, as a weapon with an extremely good Air Seal can be higher than the rating, and a weapon with a bad Air Seal or Wide bore Barrel can see this drop.
To work out what FPS the chosen spring should approximately produce you first need to convert the 'SP (Spring Power)' rating from M/s to FPS. To do this you can use the following formula:
SP Rating x 3.28 = SP Rating in FPS, eg. SP100 x 3.28 = ~328FPS
Please note, that only Standard SP rating spring should be used in normal Airsoft AEG, such as springs up to a max of SP-110, as values over this can make your weapon too powerful and fall foul of UK Gun Laws. Please ensure that the higher power springs are only installed on DMR Rifles (SP-120 Max), and Sniper Rifles which use AEG Springs (SP-150 Max), and any other High Powered Spring should only be used in Dual Sector Gear gun setups which require High Powered Springs, though fire under 350fps.
If you are unsure on what power spring you require please feel free to give the shop a call on: 01484 644709 and talk to the Workshop about your options, or ask the community via at the bottom right of every page.
Internal Part Type
SP-85 , SP-90 , SP-100 , SP-110 , SP-120 , SP-130 , SP-140 , SP-150 , SP-160 , SP-170 ,
Internal Part Construction
Part for Power Source Type
Spring Manafacturer Power Rating
Approx. M-85, Approx. M-90, Approx. M-100, Approx. M-110, Approx. M-120, Approx. M-130, Approx. M-140, Approx. M-150, Approx. M-160, Approx. M-170,
Spring Approximate M/S
Approx. 85m/s, using 0.20g BB, Approx. 90m/s, using 0.20g BB, Approx. 100m/s, using 0.20g BB, Approx. 110m/s, using 0.20g BB, Approx. 120m/s, using 0.20g BB, Approx. 130m/s, using 0.20g BB, Approx. 140m/s, using 0.20g BB, Approx. 150m/s, using 0.20g BB, Approx. 160m/s, using 0.20g BB, Approx. 170m/s, using 0.20g BB,
Spring Approximate FPS
Approx. 278fps, using 0.20g BB, Approx. 295fps, using 0.20g BB, Approx. 328fps, using 0.20g BB, Approx. 360fps, using 0.20g BB, Approx. 393fps, using 0.20g BB, Approx. 426fps, using 0.20g BB, Approx. 459fps, using 0.20g BB, Approx. 492fps, using 0.20g BB, Approx. 524fps, using 0.20g BB, Approx. 557fps, using 0.20g BB,
Upgrades and Downgrades should only be undertaken by experienced players, or Airsoft Technicians. Please note, changing any internal parts of a weapon voids its warranty unless done in-house by our staff.
Please ensure that when fitting parts the part purchased is the correct part, as once a part has been fitted we cannot accept return.
We do know that players love to tinker, so we're here to give you help should you require it, and if needed you can get in touch with our workshop for more help!
Please note that some parts may be unique to a specific brand of weapon. For example: Parts for an ASG M4A1 may not fit an ICS M4A1.
Parts from the same brand typically have a high chance of fitting, though be warned, some replicas use unique parts, so please ensure the part will fit before you attempt to fit it.
If you require help with fitting any parts feel free to get in touch with us via our Contact Us Page.
For more information with fitting parts, or should you require help, feel free to get in touch with our Workshop Department via our Contact Us Page.