I know how it happened.
2 roughnecks, a Gen 1 Texas Defender, a Mini (same as Cowboy Defender but comes with 2.5" barrel), a Texan, and a Stinger (.380)
The 2.5" .40 S&W barrel I just got brings the total number of barrels to 13:
2.5" Rough series: 9mm and .357 (on the Roughnecks), 45 Colt, and .45 ACP.
2.5" polished: .45 Colt (on the mini) and a .40 S&W.
3" polished: .45/410 (on the Gen 1) 9mm, .45 ACP, .22 LR.
6" matte .357.
6" .45/410 (on the Texan)
.380 (Stinger)
No, I don't need to ask you how it happened. I know exactly how it can happen.