What is the best gun on cod 5 online no fickin ray gun

It is all about opinion.

For example:If you like rifles then I would recomend the M1A1 Carbine,Gehwar 43 or SVT 40.

Or if sub-machine guns is your kind of thing then MP40,Thompson,PPSH.

Sniper:would defauntly be the PTRS 51.

Machine gun: MG42,Browning M191 or BAR.

Shotgun Trench gun obviously.

Well those are my opinions.