I've recently picked up an older .22 S400 xtra FAC. I've installed a regulator and really like the rifle. I shoot indoor silhouette and this rifle is just too powerful for that. I've lightened the hammer to 36 grams and have considered changing the hammer spring and perhaps the firing valve spring to calm the rifle down but it would be much more useful to have a power adjuster wheel. I'm wondering if I can just change out the firing valve housing with one that it setup for a power adjuster, then buy the power adjuster bits? Would it be drilled and tapped to fit my current bolt housing?
Thanks in advance,