A1 Buttcap Only MP5A1 A2 Fixed Stock/Full Auto MP5A2 A3 Retractable Stock/Full Auto MP5A3 A4 Fixed Stock and Burst Group MP5A4 A5 Retractable Stock and Burst Group MP5A5 A6 For SD only retractable/Burst Group MP5SD6 The SD series goes SD4 buttcap only with burst group, to SD6 retractable stock with burst group. The 'A' is not used when describing the SD versions. There are exceptions that only familiarity with the weapon system distinguishes. For example, you might say HK33KA3, but not HK33KA5, even though it would be correct.

This is primarily because the HK33 was never available with a burst group option until a few years ago, and the gun is now discontinued. The main departure from this nomenclature is on the G3. See the for more detail there. Another departure is the MP5KA1, which has no traditional sights.

With a burst group, it is called the MP5KA4. Most recent manufactured HK firearms (within the last 10-15 years or so) have specific numeric prefixes to their serial numbers that denote models by caliber and type. What significance these numbers have or how they are chosen, I do not know at this time. Here is a listing of several of the models and their serial number prefixes. I will add to these as I get more of them. Most all older HK firearms do not have prefixes at all, or just a single letter prefix.

Contents • • • • • • • • • • • • • • • • • • History [ ] Design work on a new family of pistols commenced in September 1989 focused primarily on the United States commercial and markets. USP prototypes participated in rigorous testing alongside H&K's entry in the Offensive Handgun Weapon System (OHWS) program requested by the (USSOCOM) and which would later result in the. The USP prototypes were then refined in 1992, based on input from the OHWS trials, and the design was finalized in December of the same year.

The USP was formally introduced in January 1993 with the USP40 model (the base version) chambered for the increasingly popular cartridge, followed soon by the USP9 (using the cartridge), and in May 1995—the USP45 (caliber ). In contrast to the ambitious and innovative,, and designs, the USP uses a more conventional Browning-style cam-locked action, similar to that used in the - but with a frame. Решебник По Математике Для 2 Класса Богданович more. Design details [ ] The USP is a semi-automatic pistol with a mechanically locked breech using the method of operation. This rather conventional lock-up system has a large rectangular lug over the barrel’s that rides into and engages the ejection port cut-out in the slide.