I had a 12g shockwave and traded it off. Then I shot someone’s 20g and was much more comfortable and manageable.I inherited my Shockwave from my stepfather. It was unfired when I got it. Probably a good thing he never fired it since he was about 73 when he bought it. When I finally got around to shooting it I loaded it full of high brass birdshot . I think I fired 3 and cycled the other two out. I ain't no sissy Mary and have owned and fired other pistol gripped 12 gauges over the years but I gotta say shooting that thing SUCKS ! I still dig it especially for the looks and the whole concept of what it is. But to actually use it is another story.
Is the RIA gun the pistol gripped semi auto mag fed deal? If so I kinda dig it from a looks stand point . But on the other hand mag few shotguns and actually the mags themselves are huge and unwieldy. So like you I have to vote for the Shockwave.