AMG, is this about right?
Sorosub Nightstalker (Ltd. Sniper Rifle)
Cost: 4000 Damage: 3d8+2 RoF: S
Weight: 4.5kg Type: Energy Availability Military
Range: PB (0): 0-30 Short (-2): 31-60 Med (-5): 61-150 Long (-10): 150-300 Extreme Range (-15): 301-450
Special:
-Extreme Range: that goes from: 301-450 sq at -15 penalty, however the additional range comes at a cost, the rifle gets only 25 shots per power pack, half of what a normal rifle gets
-Low-light Targeting scope: A standard Low-light Targeting scope, . The Scope may be removed to treat the rifle as a standard blaster rifle. Adding/Removing the scope requires 10 minutes and a DC 10 mechanics check
-Balanced for Range: The rifle is specially balanced for long range granting a +1 Bonus to attack at Medium, Long, and Extreme Range. The balancing and targetting scope also Applies a -5 to hit at Point Blank and Short Range
To Breakdown what you get:
1,000 cr (Standard Blaster Rifle)
1,000 cr (Low light Scope)
2,000 cr (+2 Damage customization)
-5 to hit at Point Blank & Short Range/+1 to hit at Medium-Extreme Range
Extreme Range/ 25 Shots per Power Pack
there is a drawback to every benifit that isn't paid for outright meaning its balanced to the standard guns. Its not clearly better or worse than anything else, just different. Carrying a Heavy Blaster pistol as a side-arm even negates the major downside of the weapon.