Why was the cap gun invented?

What is the NAICS for small firearms? What are the types of guns? Is a Davis gun good quality? What is the value of a Remington 20 gauge single shot shotgun? What is value of crosman mark 2 target gun 530 892 without box? Are there gold swords in real life? What is the value of a winchester 405 model 1895? What is the value of a 1935 Browning Auto-5 shotgun? What did the remington targetmaster model 41 sell for new? What is the value of a bsa skb double barrel shotgun selective trigger under and over 12 gauge 40 years old serial number avail? What is the age and value of a 10 gauge Wm Parkurst double barrel shotgun with a serial number of 25? Are cap guns dangerous? When was a Remington double barrel 12 gauge shotgun with serial number 112720 manufactured? What are the characteristics of the 357 sig? What is the approx value of a Smith and Wesson 38 spl 5 bullet revolver with 2 inch chrome or nickel barrel with wood grain grips and gold or brass colored trigger and hammer serial number J84034? What is the age and value of a 16 gauge Volunteer Arms serial 900492? How old is your first generation colt pistol serial number 325146? Why do shotguns have different gauges? What is the value of my mossberg 20 ga shotgun model 85c? What is the name for the 243 hunting gun?