imo, WASTE OF MONEY.$50.00 for an Otis Tactical Cleaning kit will give you just about everything you need to clean weapons from .17 cal to .45 cal. Shotguns, pistols, and rifles...the whole mix.
I have one. It works exactly as advertised. A royal PITA. It's great if you want to quickly run a few patches through your gun in the field, but it is a very inefficient and laborious. The flexible wire rod is a tedious. It takes FOREVER to get a really clean bore. MUCH faster and more efficient is taking the barrel off and using a rigid cleaning rod with a nicely fitting o-ring bore jag that uses most of the patch to clean, instead of the little rubber bit that uses a tiny, tiny fraction of the patch.
I shoot sporting clays every sunday, and clean my shotgun every sunday night. I've JUST about had it with the otis system. Like I said, it would be great for quick cleaning a gun in the field without taking the barrel off, just to get some of the gunk out, but I swear, if nobody took a hint and bought me a better cleaning system with a real rod and o-ring cleaning jag, I will be buying one before next sunday's cleaning.
This is just my opinion, from using the otis system weekly for months. It was a mistake. I understand others rave about it, but I couldn't let another shooter buy one without at least putting forth the reasons that I dislike my Otis cleaning system so much. After using it 20 times or so, I have come to hate it.