I installed a spring I got from MM as well and it shot the speed up over 230 fps over what I was getting when I first aquired the gun.... I also installed a JM seal in it and the gun has over 500 rds thru it and is just now starting to group.....still loud as the devil though...... I did fire about 50 10.5 ulta mags thru it to see what they would do....they group nicely, but the sound level didn't seem to drop much....... I went back to 7.9's and really don't see a large enough difference to change out pellets.....
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