The 150 spring should give you around 460-500 fps (depending on other factors), which should be high enough to use .36's with. I would stay away from the 190 because unless you have upgraded the sears and not just the housing, the trigger would most likely break. Although the 150 spring would be strong enough, im not sure you absolutely need it. Form what i've heard, the utg kit comes with a spring that is actually very similar to an m170. Laylax is a good company that you will probably want to get in the end, but if an m170 is what you want, I wouldn't compromise for something you don't want (150 or 190).
You could also try looking on other websites such as airsoft atlanta, airsplat, or LA wings inc. if you take a look you might find what your looking for, for a more reasonable price than on red wolf.
Hope this helped
You could also try looking on other websites such as airsoft atlanta, airsplat, or LA wings inc. if you take a look you might find what your looking for, for a more reasonable price than on red wolf.
Hope this helped