You seem very eager to get feed back. I think your guns are quite nice. However, you break a rule that the game designers have set up. A new weapon should never have better crit range _and_ bettter multiplier. I.e. an axe has x3 and a sword has 19-20. No weapon should have both. Your guns doesn't appear "professionally designed" if you have both. Sorry.
Instead, you should probably add a special rule. For example your Double Musket packs som pretty hefty punch. If you change the critical to x4 and add Improved trip you might get the effect of a really powerful weapon.