Ok i know exactly why the one gun isnt cocking. Did the piston have the silent shaft on it or did you place the little grub screw in? If you put the black grub screw in it will back out an dhit the spring guide making it almost impossible to cock. Take it out and threadlock it in. It could also be the spring guide is loose. The spring guide actually can unscrew and does essentially the same thing the screw does. Sometimes you just have to use a little force to take the cylinder head off. Of course if you cross threaded it i cant really help you. The silent dampers are a set meant to be used together. The fps variation isnt enough to be bothered by it i find. it iwll make your setup last much longer. I think at most it will have a 10 fps +- variation.
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