The Low Profile Quick Detach Mount (LPQDM) is designed specifically to be used with the X-Sight 5, X-Sight LTV, ThOR LT, ThOR LTV and ThOR 5 320/640 Series of scopes. The LPQDM allows you to quickly switch your scope between rifles; allowing you to take full advantage of the 6 different profiles you can utilize in your Smart HD scope. The High Profile Quick Detach Mount (HPQDM) is designed specifically to be used with the X-Sight 4K, ThOR 4 and ThOR 5 640/XD Series of scopes. The HPQDM allows you to quickly switch your scope between rifles; allowing you to take full advantage of the 6 different profiles you can utilize in your Smart HD scope. Simple to install and use, the quick Mfg: Atn