It works like it is supposed too, The red spring kicks a$$!!!!
I could not find any weaknesses
Well this spring kit is awesome....I felt that my gun was not getting high enough velocity
(It was shooting 265 that may be high for some people but not high enough for me)LOL
When i got it i read the instructions and it said change the trigger spring with the one they sent me but i didnt want to so i just said F*** it, and I put that red spring in that i hear so much about. And holy crap....I could go hunting with it now it shoots so freaking hard. I did have my gun make a weird leaky noise in the chamber but i am sure that was my gun and the fact it was 35 degrees outside and i still have stupid a$$ co2 instead of compressed air....well anywayz this product is great i recommend it to anyone that wants to lower or raise their velocity to make your oppenents cry.