Personally, for a character that specializes in extremely long-ranged combat, a good sniper rifle is without a doubt the best tool for the job. Even if they have to run and gun, the -1 isn't too bad of a penalty, and if the rifle is modded enough it will be just as deadly at 5 meters as it is at 1000.
I used to give my dedicated sniper a shotgun as a backup weapon, but I found on the rare case she needed to work at close ranges the sniper rifle was still better. There are very few things it isn't at least adequate for, except concealed carry.
And the mental image of a gnome carrying a Barrett on a run-and-gun scenario is just too awesome.
I'm genuinely interested, why do you prefer sniper rifles over assault cannons for long rage combat?
Seems to me like ACs have the upper hand in range, damage and AP-ability. Is the 14F availability of the ammo why you don't prefer ACs?
Assault Cannons:
Can not mount silencers, or sound suppressors
Limited to AC rounds only
Double uncompensated recoil
Slightly less range then a Sniper rifle (by 50 meters)
SS firing more.
Compare all that to a to a Sniper rifle:
Can use silencers/suppressors
Can use any ammo type available
longer range over an AC (by 50 meters)
usually SA firing mode (some sniping rifles are SS, but the vast majority are SA)
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If you look at the stats for a AC, they are:
name: DAM AP MODE RC Ammo AVAL Cost
Thunderstruck: 9p (1/2im)-4 SA (1) 10c+E 24F 13K
Vigorous 10p -5 SS - 12c 18F 4k
XXL 10p -5 SS (1) 15c 20F 5.5k
Ammo for an AC
Name Dam MOD AP MOD AVAIL COST
assault cannon as cannon as cannon 16F $450
AV as cannon -1/-3* 20F $2500
* -1 vs people, -3 vs vehicles
Now look at the Sniper rifles:
Name: DAM AP MODE RC ammo Avail Cost
Strike 8p -3 SA (1) 14c 10F 3.3k
121 9p -4 SA (2) 14c 18F 9k
Enforcer 7p -3 SA (2) 2x12c 12F 4.8k
SM-4 8p -3 SA (1) 15c 16F 6.2k
2100 7p -3 SA (1) 10m 10F 5K
then the Ammo that in commonly used:
Name: DAM MOD AP MOD Avail Cost
APDS - -4 16F $70
EX-EX +1 -1 12F $100
AV - -4/-6* 18F $120
reg - - 2R $20
SS 6s(e) -1/2 im 5R $80
* -6 vs Vehicles and barriers -4 vs people
So, Aside from the thunder stuck, I throw APDS and AV rounds into my sniper rifle and I have better AP then an Assault cannon (by 2 points with the barret 121) The weapon is mostly silent, I get 2 shots off to a assault Cannon's 1, and I have better range. all for only -1 to -3 less damage per shot. Not a bad trade off, especially considering the second extra shot.