light guns...look for sub machine guns or short rifles...not full length rifles..
my p90 is really light that it's so easy to run with..it's like a pistol lol

I had an AK full metal at like 7-8pounds, 7-8pounds is nothing..but due to it's long length it was a pain..

G&G is good...although I had a bad time using an older combat machine from a friend. however TR4 should be good..