Before you buy... if you said 120 psi didn’t work... that’s “about” all you’re gonna get from a 16-gram CO2... threaded or otherwise.
I cannot find specs on the RMC CO2 cartridge either... but.... you may want to save $40... this time. When I used the CO2... the ball was in there from the previous season since I hadn’t fired it. In the past, I’ve gone a full season with the ball still seated... and killed a deer the following year with that same ball. Not the best idea... probably for safety reasons alone... but
.
I did butter up the barrel a little prior to using the CO2.... and it literally just plopped out... no huge noise... no damage to anything and it kinda just, un impressively, rolled across the ground... a lot like, when old people bump uglies. (Plop... thunk... that’s it... show’s over.)
I’d recommend that anyone use the recommended caution because your experience may be way different than mine.