I have a salish military mage/sniper that's downright deadly with his 121.
Extended barrel, silencer, BF mode mod, commlink with signal 6 and eccm, tacnet and a nasty little sprite the TM loaned out to him with clear sight and a couple other programs. Usually uses AV or APDS (-8 AP total), but he has a full selection with him, including subsonic. And his scope is optical so spells are still an option. (you would not BELIEVE how much chaos you can cause at 1600 m away with just a magic fingers spell.. hehehe)
Lesee.. 1650 meters away? Short range, short burst...
For other work he has a M22A1, and tends to stick to SA mode just out of the habit of accuracy over firepower.
Are there others that are better at spellcasting or firearms? Of course. But drop a silence and invisibility spell, then then shoot? They'll never pinpoint where the shot came from.