Originally Posted by AK_Stick
They both have their uses.
If you're going to use NVG's a removable is probably for you.
Aaaaaactually, if you're talking about the twist mount, then what appears to be "removable" would leave you with the rail grabber left behind, taking up space, and preventing you from mounting a PVS-14 weapons mount. (unless you have an allen key)
The roll mount IS
quick detach like all Larue mounts, leaving nothing behind on your rail.
The roll mount is superior to the twist mount in every way.
I run mine on an FAL carbine too.