Choate Tool H&K 93 Plastic End Cap W/Loop. This end cap is there to plug the opening at the rear of the receiver. It does close the gap at the rear of the receiver and act as a dust cover to keep out dirt and debris. This end cap does have a small air hole in it to keep out rain and dust. This end cap also does not come with the buffer or screw in post installed. With the plastic end cap you can keep the factory railed end cap on your H&K 93 and keep the railed endcap off to use the more compact end cap. Specifications for Choate Tool H&K 93 Plastic End Cap: Manufacturer: Choate Tool Country of Origin: USA Gun Make: Heckler & Koch Features of Choate Tool H&K 93 Plastic End Cap Polymer. Comes with buffer installed Package Contents: Choate Tool H&K 93 Plastic End Cap Choate Tool CMT-15-09-03: H&K 93 Plastic End Cap W/Loop