All good points, but at least partly a meta-game explanation.
I'ts possible. The first time I really rationatized that it ws to justify the many Auto-pistols and SMGs seen in AHL...
SNub guns would replace conventional firearms almost completely if that were the primary reason. My reasoning, lower-tech colonies, in conjunction with yours, explains in-universe, why they're still so prevalent, even dirt-side.
Once again, I'm not an expert (to say the last) i nweapons, and less so in ammunition, so take my thoughts for what thei're worth...
The snub weapons (as the Accelerator rifles, for what's worth) are excellent weapons for low gravity, but they have several drawabaks, most of them comming from its main advantage: low muzzle velocity. As most of those problems come from ammunition, I guess I'm not going too much off topic.
1> ammunition is more expensive (in CT, revolver ammo is 5 Cr, Snub 10 Cr; In MT revovler ammo is 3-8 Cr, snub 10-20)
2> due to the low velocity, snub ammunition is either tranq, HE or HEAP. In the tranq case, armored targets become quite difficult to hit (in MT, even lightly armored targets are protected), in the HE and HEAP cases, collateral damages are not avoided. I guess they have not enough velocity for just kinetic damage ammunition, so none is featured in Traveller (EDIT:I've just realized how my signature explains that :rofl: END EDIT)
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3> while a good short range weapon, HE and HEAP may not be used at close range, as you can be affected by the explosion (for CT: infered from AHL rules, I don't find it now in rules, but HE is outright not allowed at close range; for MT, danger space is 1.5)
4> less accurate at medium range (in CT, not reflected in MT) and not able to shoot farther.
I know point 3 may seem incongruent (if not outright contradictory) with my post above, but I guess you'll understand what I mean.