9mm. 2,4,6,8
guage refers to the size of the shell any particular shotgun will fire.
The same reason rifles come in different sizes. Smaller gauges generally have less recoil, throw a smaller pattern, and some people just prefer different sizes.
The difference is mostly we use spacers for our car wheels but use ear gauges for ear.
slip gauges are the end standard devices used to measure length. angle slipgauges are used to measure angles . both of them can wring with each other .. and evrything is same : )
They were a brand of Crescent Firearms. They probably came in 12, 16, 20 and .410. It is possible but unlikely they came in 10 and 28 gauges. It is exceptionally unlikely but possible they came in 32 gauge. They seem to be running around $300 in 2012.
They made identical shotguns in other gauges, but if it is not a 16 gauge, it is an Auto-5, not a Sweet Sixteen.
Conventional shotguns run from 10 gauge (very big) to a .410 (smallest). The most common are 12 and 20 gauges, a little less common are the 16 gauge and .410 (.410 = 67 gauge). Some of the less common gauges are 32, 28, 24, and 10 gauge. There are also monster 'punt' guns usually 6 or 8 gauge mounted to a boat. The smaller the gauge number, the bigger the gun.
12 has a bigger bore.
The 'g' added on to bar means 'gauge', as opposed to bara, meaning 'absolute'. The 'zero' of a normal gauge is normally set at atmospheric pressure (things like tire pressure gauges, water gauges etc.) These gauges will read as "10 bar" but really mean that the absolute pressure is 10 bar + atmospheric pressure (~1.01325 bar). Some gauges however are absolute gauges. These might include weather gauges, or gauges on closed processes. bara = barg + atmospheric pressure
Crescent Fire Arms Co. and Crescent-Davis Arms Corp. They made the gun with only Smithsonian stamped on it in both single & double barrel and in several gauges
heavier duty suspension, gauges, badging, ETC.