Decivre wrote:

Note that seekers do damage based on the ammunition, not the weapon. So that houserule doesn't suffice for weapons that have damage defined by the weapon. The pistols give a good gauge for how to adjust damage, however. Lose 2 armor pierce, lose 2 damage to shift down a size. That might be a good gauge for determining the effects of a holdout.

Holdout guns typically [i]do[/i] use the same ammunition as their larger sized versions, though (say 9mm Luger for instance - there are also high caliber holdout guns). They typically don't have the room for as much ammunition, however. Also, in regular firearms their typically shorter barrel does tend to reduce their velocity. Their barrels aren't always shorter, however. In addition, tech possibilities like retractable smart barrels could mitigate this or simply a better round loader system like the Boberg Arms XR9-S could give a better barrel length (admittedly you could put that same round loader in a full frame pistol). I suppose lower velocity could be modeled by a reduction in AP/dmg - but so could a reduction in range.