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.
This is a systema spring, so that sums it up, but what else is interesting is that, I also have a CA 170% spring (equivalent to this spring) and I used the CA and it went far, and the rof was a little bit slower.
I put this spring in, and it went even farther than the CA and the ROF increased a little bit. I don't know what happened, but its true.
My gun has a madbull tight barrel, a systema hop up unit, and a mauri piston head, and my gun chrones at about 389 FPS with .25.
2007-09-06 02:18:27 T. KOTTA
For: Systema M120 AEG Spring
Intalled this on my "stock" m15a4 and m15a1. No problems... It's legal for field play and packs enough punch to be cheater proof.
2007-05-27 17:04:07 J. WHITWORTH
For: Systema M120 AEG Spring
-Spring is very strong and makes the gear box hard to close when puting it in it
-Will draw blood from short range where stock springs will not
-Stripped my stock piston after a thousand or two rounds
- If you get this spring, get a polycarb piston, aluminum piston head, and a aluminium cylinder head
-the polycarb piston is a must have with this spring or else you get your piston stripped
- didnt increase my distance much at all, but it packs a hell of a punch
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