It's speed tape. It's a common quick fix for items that wouldn't be deemed a safety of flight issue (I.e. Not going to kill you). I use it all the time at my job and that stuff kicks ass.
http://en.m.wikipedia.org/wiki/Speed_tape
Refering to ANY firearm as a gun. Rifle, pistol, revolver, shotgun. Call it by what it is, not GUN..... But I was also in the Marine Corps so that's been beat into me