Depending on the intended use, the problem with a lot of the 28ga Repros is that they have WAY too much choke, and that's particularly true of those with 28" barrels, which are almost always M/F. The constrictions measure out to M/F choke on a 12ga, which is way too tight for a 28.

I don't have one at the moment, don't really need one, but if I were to run across a Repro 28ga, 28", straight/DT/beavertail, choked Q1 & 2, I'd be very tempted.