Echo 1/Modify SP120 AEG Spring
[02464 / MOD M120]
$15.90 $14.31
Displaying 1 to 5 (of 5 reviews) Result Pages:  1 
by B. HUDSON verified buyer Date Added: Wednesday 12 April, 2017
verified buyer
For: Echo 1/Modify SP120 AEG Spring
Product Information:
I put this in my krytac spr mk2 and there is definetly a increase in fps. Good for making a difference in fps with out having to get a deferent motor or decreasing your guns rps.


by C. BURKHART verified buyer Date Added: Friday 09 May, 2008
verified buyer
For: Echo 1/Modify SP120 AEG Spring
Definately is more tense than a stock Echo 1 spring and adds some good fps. Fits fine with my Echo 1 cylinder set and Echo 1 spring guide.
by D. JONES Date Added: Sunday 13 January, 2008
For: Echo 1/Modify SP120 AEG Spring
i installed it into my CA m15a4 it is great with new CA torque up gears and modify piston head and got it shooting 400.1 fps then it went down im shooting around 366 - 370 but its good because im a close quarter combat type of guy
by P. LEGASPI Date Added: Friday 05 October, 2007
For: Echo 1/Modify SP120 AEG Spring
I bought this spring yesterday & installed to my CA m15a4 rifle with systema cylinder set,JBU 509mm tight barrel , king arms hop up chamber & it shoots 445 to 450 fps using .20g Bbs & guarder chrono. This spring is HOT!!!!
by G. MYKULOWYCZ verified buyer Date Added: Monday 27 August, 2007
verified buyer
For: Echo 1/Modify SP120 AEG Spring
fully compressed the spring is 2.24 inches long ( wire is .7 inches thick and it is wound 32 times .7 *32=2.24inches) now in my particular gun the spring must be 2.1 inches or less when full compressed (a CSI AK assailant with upgraded v3 gearbox) this means it is physically impossible for the gun to fire (ever). i have a feeling this is because both my upgraded piston head (echo 1/modify aluminum piston head) and spring guide (echo 1/modify metal spring guide) both have bearings which subtract about a half inch from the maximum spring size (when fully compressed), if i did not have the bearings i would have a spring be about 2.6 inches when compressed, meaning the gun would fire. but one would expect when the same company makes the spring spring guide and piston head they would realize something like this (the spring being too big for a gun to even function). as of right now i have had to revert back to the stock spring but i plan on getting a MadBull or PDI spring.
Displaying 1 to 5 (of 5 reviews) Result Pages:  1 
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