The state of RI defines a junk pistol/revolver as one made from non heat treated metal, (Not all steel). The Sentry is listed. Strange thing is, the NAA mini revolvers are also listed. They, of course all all stainless. Just goes to show, they have no clue, just rush to ban handguns, any handgun, for any reason.
If I were shooting your Sentrys, I'd shoot them with light loads. Bet they would work just fine.
Savage