No they won't fit. If you force it, it will ruin the rifle.
A pistol that fires .177 diameter pellets.
No it is not designed to shoot pellets.
.177 cal. Crosman, daisy, rws, beeman, marksman all make pellets in the .177 size
The Crosman Phantom is designed to shoot ONLY .177 pellets NOT BB's, they will ruin the rifling in the barrel.
You need to consult your owner's manual. Some BB guns can shoot pellets, but some cannot.
The Crosman model 761XL is designed to shoot BB's or any .177 Caliber pellet. These are the most common pellets you can find. Make sure you select .177 Caliber pellets.
As long as the pellet is .177 Cal then any .177 caliber pellet will work in your .177 Gamo.
I suggest: JSB diabolo, Crosman premier, predator polymag see: http://www.pyramydair.com/pellets
4.5 mm and .177 Cal are the same size. It's just two different units of measurement. Millimeters verses Caliber.
Pyramydair carries all types of pellets. See the related link.
It does not.