I have 2 ROA revolvers, a 51/2" and a 71/2" with target sights. The 71/2" was on the dealers books as a 44 which was the slot i had but the 51/2" i applied for 44/45 pistol with a letter explaining they are actually the same as all ROA pistols use a 457 ball. Licence came back as per request.
If you are serious about one Slap a deposit on one if you can find one. Conclude the transaction when your licence comes back. They are brilliant pieces of engineering that will last a lifetime if looked after, ie cleaned after use. They are getting harder to find so dont prat about if your serious about having one, go for it. You wont be desapointed.