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S&T Upgrade Spring for M40A3 Series Airsoft Sniper Rifles - 500 FPS

ID: 62516 (SPR-ST-M40A3-500)
4.8 stars, based on 4 reviews
S&T Upgrade Spring for M40A3 Series Airsoft Sniper Rifles - 500 FPS
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The manufacturer of this product enforces a strict minimum advertised price (MAP) policy which excludes this product from any additional discount coupon codes. This item, however, may qualify for free shipping.


  • Upgrades muzzle velocity to 500+ FPS
  • High quality spring steel
  • Direct drop-in part
Velocity: 495 to 525 FPS
Compatibility: For S&T M40A3 series Airsoft sniper rifles

Manufacturer: S&T

About S&T

S&T is a group of Airsoft enthusiasts that produces rifles and parts based on the trends in the Airsoft industry. Their mission is to supply a wide range of quality products with the most competitive pricing for dealers and consumers alike. S&T was founded in 2009 with their HQ office located in Hong Kong, a subsidiary office in Japan, as well as Airsoft / Airgun manufacturing facilities in China.

4 Customer Reviews

(Write a review)

by PAVEL C. on 01/06/2023
"Installed this and a tight barrel, gun shoots so much harder. Haven't had a chance to Chrono yet.

For anyone wondering, yes this does fit the Matrix/Double Eagle M40A3. Very easy modification.
by Cameron L. on 11/14/2020
"Works great! Just installed it in my M40a3 sportline, and the install only took about 5 minutes. Was shooting around 510 with .20 bbs, but might drop a little bit as the spring settles with time. Also, I recommend a minimum of .32 gram bbs. If you can hop heavier, then the better.
by Daniel S. on 12/16/2019
"This spring is longer than the stock spring, but it works all the same. I put this in my ASG M40A3 Sportline.

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