There are no "easy" ones that don't already have "10/22" stamped on them in some place. Airsoft rifles are pretty much designed with the stock being an integral part of the weapon itself, not like firearms where the stock pops on and off with ease. S...
BB is .177 cal, or 4.5mm airsoft is 6mm BB is a tool for taking small game or developing marksmanship airsoft is a toy. bbs are metal airsoft balls are plastic
Try to find an Airsoft supplier in your area, they sometimes have an airsoft repair person working there. If not, there are a few airsoft sites that offer repair manuals you can down load. Look in your area or check with other players , they my know ...