On the 15-22, I have only used the Tacticool & the Doomsday. Both are great products. If you want or need larger ears, then I suggest the Doomsday... for now. If you like it small & out of the way, you can't beat the Tacticool22.
Google finds it better if you use Tacticool22 as opposed to just Tacticool.
Bolt Parts : Tacticool22, Tactical .22 Rifle Parts and Accessories
The Simple Weapon Solution's latch works great with it.
http://www.simpleweaponsolutions.com...harging-handle