Regarding ammo, when smokeless powder, which preceded non-corrosive priming, became widely used in rimfire ammunition, indoor gallery shooting became increasingly popular and widespread. The introduction of non-corrosive priming in rimfire cartridges in the later twenties made gallery shooting much simpler in terms of maintaining the rifles. Indoor shooting galleries were probably at the height of their popularity in the decade after this development.
Other rimfire ammo used in gallery shooting included variations of Flobert .22 BB and CB, as well as Flobert 6mm and 4mm. These are relatively weak rounds, accurate for only a short distance.
In Europe especially, garden or parlor guns were popular. Firearms makers such as Anschutz made a variety of Flobert ammo shooting rifles, many of them what are often referred to as "boys" guns. Some took shooting Flobert ammo seriously enough that Anschutz made Flobert 4mm versions of their 54 match action standard position rifles, from the 1407Z through to the 1907Z. The Z denotes a Flobert chambered model, and the while the 1907 itself is in current production, I don't know if the Flobert version is in current production. These rifles shoot only the Flobert 4mm ammo and are identical to their .22LR siblings in every way.