yea they do u sould see the mods
theres on witha gl/scope >_<
were adding mods to guns like u choose a AK47 and u choose some mods but if u choose alot or stuff u wiegh more so your slower... so if u had a barrel/Scope/Tripod the gun would wiegh more
oh and were not having a Gl/Scope >_< thats stupid lol