Hmmm... I think it's workable as a stand alone, but misses an opportunity for two or three weapons.
Here's the full set, including Sartris' request for 1 damage at 1 km range:
Weapon Type Heat Damage Minimum Short Medium Long Ammo Tons Criticals
Very Light Gauss Rifle DB,X 1 5 4 1-9 10-18 18-27 24 9 4
Ultra Light Gauss Rifle DB,X 1 3 5 1-10 11-20 21-30 32 6 3
Extremely Light Gauss Rifle DB,X 1 1 6 1-11 11-22 21-34 50 4 2
If they take critical hits, the VLGR explodes for 10 points of damage, and the ULGR and ELGR for 5.