Looking for Shorter RM Barrel -- Wanta Trade?

[Patrick Henry Brown]

I've got an 1851 Octagonal Barrel in 7 1/2" and an 1860 Round in 7 1/2", both Richards-Masons Conversions and both in 38 Spl. I'm willing to trade either for a 5 1/2" barrel. Both are in excellent condition.