The Zenith is imported from MKE. MKE in Turker was given the blueprints and machinery by HK to produce it's legendary MP5. While MKE no longer produces directly for HK; they were allowed to keep the manufacturing equipment and continue producing civilian versions of MP5s under license. 
 
Zenith’s Z-5RS is a semi-automatic, pistol variant of one of the world’s preeminent submachine guns. Inspired by the design and operating principle of the original manufacturer’s famous battle rifle, this full-size close quarters weapon pairs the versatile 9mm cartridge with a performance maximizing barrel length, sight radius, and forearm. Produced in Turkey on original equipment, the Z-5RS is a perfect base for short-barreled-rifle and full-auto conversions, but also an effective pistol that affords iron-sight accuracy at distances exceeding 100 meters.
 
It is covered by a five-year warranty, and ships in an MKE hard case with a slimline forearm, a Picatinny optics rail, three magazines, a military-style sling, two extra takedown pins, a cleaning kit, and a user manual.
Caliber – 9x19mm Parabellum
OA Length – 17.9 inches
Barrel Length – 8.9 inches
Barrel – cold hammer forged CMV
Weight – 5.5 pounds
Operation – semi-automatic, roller-delayed blowback
Twist Rate – 1:9.8
Sights – rear drum for elevation and windage; front protected post
Capacity – 30
Colors – black
Includes – slimline forearm, Picatinny optics rail, MKE hard case, three magazines, military style sling, two extra take-down pins, cleaning kit, and five-year warranty
Additional – 3-lug barrel with 1/2×28 RH threaded end
Made in Turkey by MKE