H&K MP5K/SP89, Zenith Firearms models Z-5P and Z-5K Back Plate With M4 Telescoping Housing Only

Description

The MP5K  family of weapons: The stock is held on with two push-out pins. This is an all metal end cap that fits in the back of the receiver & holds the trigger group in place. It has a M-4 housing attached to the end of it. The threads are the same as any standard AR-15 tube.