It might fit, but why would you want to do that. It has no gun powder and won't fire.
As far as I know Gamo never made a bb gun named the FIX. They did make a model named the CFX, but it is a rifle and shoots pellets, it's not a bb gun. I suggest you contact Gamo at the link below and ask them.
The purpose of a paintball gun is to fire paintball pellets, to mark opponents in the game of paintball.
(Pellets) One at a time between shots. However it also holds 50 BB's
NONE! this is a pellet gun not a BB gun. Using any hard BB will ruin the rifling in the barrel and make the gun inaccurate. Read page 6 of the owners manual it tells you how to load the gun and says nothing about BB's. It should shoot pellets only.
Two ways. Pellets come in different weights. USE lighter pellets, like GAMO Raptor pellets OR purchase RWS or Crosman pellgun oil (DO NOT USE 3 IN ONE oil, It will eat the seals) Put a few drops of pellgun oil in you pellet tin. DON'T Drown them) This will lube your pellets and the barrel. They will fly faster.
Every Pellet gun has to shoot over 200 shots before it is broke in. And then you have to try different pellets to find one that fits the situation, every gun is different. However I suggest starting with H&N, Beeman Kodiak or JSB. They all have different pellets to choose from (Look for Match grade pellets.) I do suggest you stay away from the Gamo Raptor pellets. They may be fast but they are too light and are effected by crosswind.
BBs, mainly. If you can breech load it, they can also fire pellets and darts.
While many pellet guns are configured to be able to fire regular BB's, most BB guns cannot fire standard BB caliber pellets. To fire a pellet, the BB gun would have to be a breech loaded or break-barrel loaded design, and the pellets would have to be loaded single-shot.
Gamo extreme hunter
That is where the pellets are stored in the gun.
no, metall bbs will break your gun, and are too small to fire properly. Do not attempt this.