WARNING! it is easy to get the addiction and before you know your hundreds of dollars into just fixing up your gun.
Every time you look at an AR15 you will think, wow, I'll bet my 15-22 would look cool with one of those, or look cool like that.
It can become like a gambling addiction or like any other addiction, suddenly your wanting to replace every OEM piece on your gun till you've created FRANKENSTEIN'S 15-22.
Use extreme caution my friend.