Good but issues - FAB Defense Ergonomic Folding Pistol Grip for M16/M4/AR15

Once installed, the function of the FAB folding pistol grip is excellent. However, getting it installed is the problem. First there are no instructions and no hardware. You'll have to go get a 1/4" x 28 x 1" CAP screw to mount . Only a CAP screw will work, as the that is what the attachment base is recessed to use. Second you have to fold the grip back to tighten the screw. Last the end of the "backstrap" may extend past the back of your receiver and/or interfere with the seating of your back plate.