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Echo1 / WELL ASR Power Up Spring Upgrade Set for ASR / SR2 / MB13 Airsoft Sniper Rifles

ID: 51578 (KIT-MB13-ASR-FTK)
MB13 upgrade breeze tube
ECHO1 / JAG859188515789MB13 upgrade breeze tube51578
4.0 stars, based on 1 reviews
Echo1 / WELL ASR Power Up Spring Upgrade Set for ASR / SR2 / MB13 Airsoft Sniper Rifles
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MAP ProtectedExempt From Coupons
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.
Temporary No-ExportTemporarily avilable in US only
This item is temporarily only available for shipping within the United States. International delivery will be available this item soon.


  • High quality CNC machined aluminum piston and spring guide
  • High quality O-ring for improved pressure seal
  • Ball bearing spring guide prevents binding
Package Includes: Piston, Spring Guide, Upgrade Spring
Compatibility: For ASR / SR-2 / MB13 Airsoft Sniper Rifles
Material: CNC Machined Aluminum, Spring Steel

Manufacturer: Echo1 / WELL

About ECHO1 / JAG

Since its inception the Echo1USA brand has strived to provide our clients with uncompromising quality of products and customer service. As avid Airsoft players ourselves, we are able to understand the needs of the sport and the frustration with inferior products. Our commitment to yielding the finest most affordable Airsoft Guns and Accessories on the market today is steadfast, and remains the foundation of our continued success.

1 Customer Review

(Write a review)

by Kyle C. on 09/23/2018
"So far so good. I have used it for one day, so idk about longevity yet.

Installed into my SR-2. Stock I was getting 350 FPS using 0.3g's, now with the upgrade I'm shooting at 430 FPS with 0.3g's. I can now shoot farther, flatter, and with less drift, and people can now feel those long range shots!

Cons: Shooting and cocking is a bit louder now since you have metal rubbing on metal, but thats to be expected. A homemade foam suppressor can bring the noise back down to stock levels.

FYI spring is for 11mm pistons like the stock SR-2 has, NOT 13mm. Also it is about an inch longer than the stock spring, so it will take a bit of squeezing it get the bolt back together.

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