This is very similar to the broomstick pistol except its another variant that not only has a full-auto adjustable firemode but its also magazine fed making reload speeds way faster. It can even get the same attachments as the broomstick pistol including a 20 round magazine, scope, stock and the long barrel.
I prefer if on the stats, the damage is higher than the Strykr pistol and have attachments that aren't as horrible(long barrel not reducing damage) but with a disadvantages with slower RoF, less stability and less total ammo like at 130-150 rounds. You could try basing the weapon sounds based off the G18 since its the one with a full auto sounds.