Known as the Gyurza or Vektor, the SR-1M and its "improved" version the SR-1MP, are specialized pistols fitted to fire the 9x21mm rounds, the very same rounds used in the SR-2 PDW. Armour penetration was key elements about the pistol, similar to the West's very own FN 5-7 pistol.
Comes with 18 rounds magazine, the pistol's unique mechanic is the ability to release its slide when a fresh magazine is loaded, thus the pistol lacks a real slide release. One needs to rack the slide manually as well.
The SR-1MP version features longer barrel to allow the use of its suppressors and flushed indents on the slide to mount rail adapters. The rail adapters are show on hover, so you can hover your attachments on all 12, 3, 6 and 9 o'clock rails. (Known bug: Sometimes the 6 O'Clock single rail may appear by itself, just drop an attachment on it and remove it again to hide it, nothing much I can do to fix it)