All slings suck. Single point slings suck most. Not called the Pendulum of Pain for nothing! But they look kool posturing for photos on the range.
A good sling (not sure what a tactile or even tactical sling might be) should allow you to easily transition to your pistol if needed, and to move without holding the rifle with one or both hands. Not found a single point sling yet that will allow this.
I mount my M&P15 sling on the forearm and stock. The M4 has a sling attachment point at the aft end of the receiver, but I don't single-point it.
M&P15-22
M4 Carbine
-- Chuck