First lets start with the grip. The one word that describes this is incredible. I know you are thinking it is just another grip but shame on you. READ and learn. The original AR grip doesn't seem to fit anyones hands, for me my finger could wrap around the trigger and I don't even have "big" hands. With the CAA UPG16 the tip of my trigger finger lays confidently on the trigger. There are 3 back and 3 front grip inserts that are held in place by pins at the bottom. the back insert changes the distance away from the trigger ie. thicker = farther away. The front inserts don't vary in thickness very much but the finger grooves get more pronounced. installation was very simple the grip fits very snug on the lower when i installed mine i took the safety detent spring out of the grip, slid the grip on about halfway and then put the spring in just before i pushed the grip all the way on. The grip has storage inside I would trust the plug in an explosion, it is super secure, yet easy enought to get out. I would recommend this grip to anyone, it is available in black, tan and green.
Heres a couple of pics
front inserts
rear inserts