Blackjack Mark

Hi: I've been thinking about trying WB since I don't need a new rifle now and had a shotgun question. Does anyone know, if under the new rules, a Mossberg 590 retro is a legal shotgun to use? Seems like it is a replica from that period? If not, is the Rock Island TPAS T1897 legal? (looks like the front sight might disqualify it). If both are legal, has anyone had any good or bad experiences with these guns? PS: Can you use a stainless 1911? Thanks, Blackjack Mark