First and foremost - most of us know, that the bolter, or boltgun is NOT a mere assault rifle. The closest real life functional principle is Gyrojet . In the bolter it is, however, complemented by the small cased expelling charge, and the bolt itself is stabilized by the built-in gyroscope. I.e. the bolt is not a bullet - it's rather a small (cal .75, or 20 mm) rocket. With explosive charge (or other fairly unpleasant things) inside. Actually, the direction taken in the WH40K: SM is right. But the grade of lethality is still not sufficient (at least without weapon perks) The closest real-life analogues to it - are Neopup PAW 20 and XM25. Destructivity of these weapons can be seen, for instance, here and, respectively, here. That's what I personally would like to see in the EC. Respectively, the bolt pistol is functionally something average between the very same MBA Gyrojet pistol and German Kampfpistole from the WW2 times. With the lethality, which is way closer to the latter and the rate of fire of the first. Yet another good thing to see - both bolter and bolt pistol should have selective fire. I'd propose 3 modes for bolter (semi-auto, controlled bursts of 2-3 rounds and full auto) and, respectively, 2 modes for bolt pistol (without full auto). Semi - auto is best used on mid-to-long range, the accuracy obtained is the highest. The controlled bursts are ideal for the mid-range fluent combat, while full auto is purely a self-defensive mode at close-to-point blank range due to its rather low accuracy.