Derya TM-22 / AR rubberized grip

fits any standard AR grip, but doesn't have the retainer hole for the safety pin, you can drill one in if needed.  Includes a mounting screw and the bottom cap is removable via screw for storage.

This has a nice robust rubberized grip that is not sticky like the magpul K2 series.. 

Price is firm, I have 3 of these if you want to get them all it's buy 2 get one free, shipping is +$20