Several newbie questions on specific parts
I had an airsoft trade recently and I had a couple of questions. First, I got two things in the package (the two black items) that I don't even know what it is. Is it even related to airsoft? Also, I got a tight bore systema, however I do not know if the normal barrel is in the bore systema package, or if it's already installed. Well, to make it short, what physical caracteristic a tight bore systema have over a normal barrel. Thanks a lot.