I have been a fan of multi-barrel pistols since purchasing a SIG 229 with both 40S&W and 357Sig barrels. Barrel change is simple and quick, and nothing is needed other than the extra barrel. Subsequently, I have acquired a 3566 Compact in 356TSW and had the PC to make an extra barrel in 9MM. Last year I acquired another SIG, a 226 in 40S&W and then purchased a Bar-Sto 9MM conversion barrel and a 357Sig barrel for it and also a 9MM conversion barrel for my SIG 229. This is a really nice set up as I can put the 9MM barrel in and add the SIG 20 round 9MM magazine, or go for the 357Sig with just a barrel change in both the 226 and the 229. My last acquisition was a Bar-Sto 357Sig barrel and a non-ported flush PC barrel for my PC 40 Recon. The extra barrels for the PC 40 Recon came about rather uniquely. I originally sent the PC 40 Recon to the Performance Center to have the ported extension cut off because they had stated earlier that no more standard length barrels were available. However, an extra PC barrel was located just as the pistol was scheduled for the work and the original ported barrel was saved. A few weeks later, I found a Bar-Sto 357Sig barrel in new and uninstalled condition. The Bar-Sto barrel couldn't be installed because the recoil spring guide rod seat was not properly machined. In fact, it was not cut into the barrel at all but only scratched the surface. I sent it to Bar-Sto for correction, but they again failed to fully machine the seat and ran up the shipping bill over $100. I finally got the barrel corrected with the help of a local gunsmith who did a fantastic job. With these four pistols, I have three that are capable of firing 9MM, three that are capable of firing 40S&W, three that are capable of firing 357Sig, and one that can fire 356TSW, and one with a 40S&W ported barrel.
I have found no functional problems and like the versatility. What multi-barrel pistols do you have and what are your opinions of their versatility?