to choose based on your position, age, and style of play. Shin guards should cover most of the area from your ankle to your knee. Measure your shin from just below where the knee bends to about 1 inch above your shoe top. This is the proper length of your shin guard. Some manufacturers label their shin guard sizes according to age.
an airsoft gun can break skin at 300 fps it all depends on what weight bbs you use like .2, .25, .3 ect. it also depends on how far you are from the person when you shoot them. it all depends. i was hit from a 300 fps gun and the bb popped my skin open and ive been hit by a 590 fps gun and it didnt leave a mark. im also on an airsoft team with people that have alot of experience.
I would probably go with a quality .22 air rifle. They are extremely accurate can shoot the pellet up to 1250fps. I can easily carry 5K rounds on my person with out taking up a lot of space (leaving me able to carry more defense rounds for the Glock). A well placed .22 pellet shot can take down plenty.ou can get a revolver in 9mm and even 40 S&W. To my knowledge only Ruger has made a dual cylinder version that would shoot 39/357 and 9mm. But the cylinder face is different for those cartridges with a rim vs. using rimless cartridges.