Depends on the size of the BBs and the weight of the shot. I.E. A 12 gauge 2 3/4" target load that has 3/8 oz shot in #7's will have over 200 BBS while a goose load in a 12 gauge 3 1/2" shotshell with BBBs will have more like 20 or so BBs
Airsoft does not have gauges (those are for actual shot-guns) but BB's do come in sizes. The sizes are known in mm (mili-meters) and they range anywhere from .12 to about .48
Brazil 12 gauge single shot gun
Numerous companies in many countries have made single shot 12 gauge shotguns.
Remington has made many thousands of 12 gauge shotguns in dozens of different models/configurations.
None
qhats th evalue of a 12 gauge single shot 1913
what is a dixon falcon 12 gauge shot gun made in Spain worth
#4 buck shot
Single shot 12 gauge.
You can, but, it will cause a slight bulge in the barrel.
25-100 USD, 12 gauge is a shotgun, not a rifle.