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Madbull M120 AEG Spring

[M03A11][02458 / MB SP120]
( 5 Reviews ) ❤ Add to Wishlist

Battery Information Video
New to airsoft? Here are some safety tips for airsoft guns that we recommend following.

Upgrade your AEG's fps to 380 to 410fps. It is highly recommended to upgrade plastic bushings and spring guide to metal bushings and spring guide with this product. Also, it would be wise to upgrade plastic pistons to polycarbonate piston; plastic piston heads to duracon piston heads; and standard gears to reinforced steel gears. Finally for best results a battery upgrade is also recommended.

Manufacturer: Madbull Airsoft
Color: Green
Material: Metal
Package Includes: One (1) Spring

see 5 reviews | Write a Review
verified buyer
J. SINCLAIR | 2013-05-05
Product Information:
This madbull m120 spring is powerful, I was recieved consistent fps around 450-465 with my kwa km4 ris. I have a madbull 6.03 509 mm barrel, systema cylinder and cylinder head. bravo toughness piston and the bravo thrust piston head to aid the fps. Still even got consitently between 23-25 bps.

Hard spring and looks cool
Consistent fps
Great spring for custom AEG's

Can be tough to install if your not strong enough to compress the spring and put it in the gearbox.
verified buyer
D. JENSEN | 2013-10-27
Product Information:
-Great spring, bought it for a VFC M4 that was shooting about 360 stock. The spring pushed the FPS to a perfect 400, was not expecting it to be so close to the mark.

-Good price
-Perfect FPS increase

-Slight loss of ROF, but that's kind of expected
verified buyer
D. JENSEN | 2014-03-03
Product Information:
Good spring. Installs fairly easily in my VFC M4. Brought my FPS up from about 365 to a perfect 400. I expect it to drop about 10fps as the spring breaks in but I'm about 1000bb's in and it's staying a consistent 395-400

-Perfect speed for a field gun
-Works well in a Ver. 2 Gearbox

-A bit expensive for a twisted piece of wire
- 400fps out of the box, probably means it will drop a bit before it settles down
Will this be good? 0 answers
1 asked
if I use this spring with my M4 which shoots 370-380 fps, do I still have to upgrade the internals?
I am not very experienced at working with airsoft gun internals. I want to upgrade the spring, but i am trying to avoid messing with the internals too much

3691 days ago
Aspen S

(I have this same question)
Staff Answer:
It should be fine

3689 days ago
1 answers
1 asked
Search Tags: Internal Upgrade Downgrade Performance Gearbox AEG Part Piece Mechbox Replacement Steel Tension Spring

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