Aside from the fact that it has the same name as the NV gauss rifle (which is used everywhere else by NPCs, etc) but different stats, it is massively overpowered IMHO.
The normal gauss rifle does 120 damage per hit, 60 crit damage, has a 2x crit multiplier, 80 item hp and uses 5 MF cells per shot.
The anchorage gauss rifle does 100 damage per hit, 50 crit damage, has a 5x crit multiplier (meaning it will basically crit all the time), 0 spread, 1500 item hp and uses only 1 MF cell per shot. It also seems to have a script that causes a 100% knockdown chance.
The normal gauss rifle is already powerful enough to kill deathclaws in one hit, IMHO the anchorage version is over the top compared to the NV one.