The only similar product is the stock Timmy End Cap
Lasoya Timmy, Ratio Volumizer, Hybrid End Cap, pretty much stock.
NIce design, when unscrewed it can still hold a seal
Slowly Twists off.
I like the design and and the cap has a strong seal, but no matter how tight I screw this thing down, the Hybrid End Cap just unscrews itself. This isn't really a big issue with me, but for some it could be important. It remains sealed though.
The ability to adjust the bolt is a plus considering the stock cap didn't allow you to do this. I guess some people were having problems with loading, etc. I really bought this for the look rather than that problem (cuz I didn't have the problem).
I might recommend going with a Check-it End Cap if you are looking for something that isn't going to come unscrewed. Overall, this is a decent cap and maybe it is just having problems on my gun considering that no one else is having issues like this.