||This spring is great, but GO BY THE CHART in the description, not the title at top.
I bought this, thinking it would be b/t 390 and 420 FPS, like the title says.
I installed this spring into my G36C, along with a high torque motor, AIM TOP piston and metal cylinder head. Everything else is stock.
As soon everything was installed I chrono'd it and was shooting about 460 FPS with .20g bb's.
I went back on Evike.com, looked at the spring description and saw that the chart says 190% (M120) ~390~460 F.P.S.
Wish I saw that before I bought it. lol. That's a little too hot for a 400 FPS max field.
Evike needs to stick to one FPS range.
GO BY THE POWER CHART in the description
Rating: [5 of 5 Stars!]