Rails are hells useful. You can mount a PEQ box so you'll be able to run a whole day with one battery. You can mount any type of optics you'd want (reflex, RDS, etc.), There's even a beer can holder accessory for guns.
The vert grip however may be a different story. If you wanna shoot like the guys in the magpul video then you might as well not get one...
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE