The boys from Milcomp visited us in order to test the APC556 PDW. Here is their review:
Tango Down grip black, BG16 (with black plug)
Suitable for all weapons of the M4/M16/AR-15 family, this replacement grip improves the grip and also offers a integrated storage compartment for small parts.
Follow the instructions of the manufacturer
Allen screw for permanent mounting
All prices shown incl. taxes.