The telescoping stock for the H&K MP5K / SP89 and Zenith Firearms models MKE Z-5P and MKE Z-5K replaces the existing stock and give the shooter the ability to change the length of pull. The housing is all Aluminum and is attached to the same end cap that our folding stocks use. Comes with our single point sling attachments and uses our AR telescoping stock. It gives the user a length of pull range of 14 5/8 to 18 inches. All NFA rules apply, fits most clones.