Unless you have a scale or the packaging, its not like they label them so you can't. Usually it's a .12g bb if you can see the seam, because no one would buy a high quality .12g bb.
Without the weight of the airsoft BB, it is impossible to answer this question as Force is affected by the mass of the projectile.
FPS depends on the type of bb used, quality of the bb, weight of the bb, and the chronograph. On top of that, it depends what shotgun it is! There are many, many airsoft shotguns out there.
yes, most green airsoft bb's are biodigradable
No. Metal bb's will not work in airsoft guns.
Standard weight is .2g. Cheap guns often work best with .12g, while people tend to use heavier bb's such as .23g with high end guns for accuracy. Snipers will sometimes use up to .4g bb's, but usually stick to between .25g and .3g bb's. Heavier bb's result in greater accuracy, but cause a decrease in muzzle velocity.
Yes, the only difference is their weight.
bb
If you are talking about airsoft bb's, then yes. Most bb's fall between .12 grams and .30 grams, and a 20 gram airsoft bb wouldn't work well.
almost every gun for airsoft uses a 6mm (milimeter) BB. try that.
BB's for air guns (NOT airsoft) only come in one size .175 commonly referred to as .177 caliber. If you want to know about airsoft BB's then you need to put the question in the "Airsoft category."
fps means feet per second the fps (feet per second) is usually more than 120 edit: The "feet per second" refers to the muzzle velocity of the gun, or the speed of an airsoft BB exiting the barrel. Since the muzzle velocity is different depending on the weight of the BB, make sure to check what weight of BB the muzzle velocity was measured with. Often, airsoft sellers will measure the muzzle velocity with a lighter BB to make the airsoft gun sound more powerful, so you may want to ask what the muzzle velocity is for the weight of BB you are going to use. Many airsoft parks will not allow airsoft guns (other than sniper rifles) to have a muzzle velocity significantly over 400 feet per second, so it is important to know if the gun is too powerful to use. Also, anything with a muzzle velocity under 175 fps will not launch BB's very far.
If you are asking about Airsoft BB shot in a regular BB gun that shoots metal BB, then the answer is NO. Real BB guns fire at a much higher rate than most Airsoft BB guns. The plastic BB could disintegrate and become flying pieces of Plastic.