Thinking about rounding out my can collection with a 45acp offering. What is the deal with the different pistons? I want a can that will be a lightweight alternative to my .30cal magnum can for a 300blk ar pistol. Seems like I can buy an endcap that adapts to 5/8x24, cool. So now when I install it on a semi auto pistol I have to remove that cap, insert a caliber specific piston(?) and install the proper threaded endcap(?) Do I need a separate piston for 45acp, 40sw, 357sig, and 9mm? Could get pricey...