I'm not going to say there's not any but I've not seen any that wasn't a gas block, but then I've not looked either.
There may be someone out there that's making a clamp on front sight that's not a gas block for a dissapator style rifle/upper, you might check into that.
There may be someone out there that's making a clamp on front sight that's not a gas block for a dissapator style rifle/upper, you might check into that.