that there are friends today I received my regulator of altaros as soon as I received it, I installed it and did some quick tests firing 10 shots with different weights of diabolo. I set the regulator at 120-125bar +/- the results were as follows Hammer spring is not the original instal a spring in stainless steel a little softer this instead of cutting the original spring personally I like more the jsb 15.89gr do not use the rifle for target I am 100% hunter mainly of pigeon and rabbit so I think it will work very well