I like it. I had a similar idea a while back.
EDIT - For anyone too lazy to click the link, here's the short version:
Battle Rifle
-Would come with inherent power "Magazine" with 20 rounds
-Powers that use the same ammunition would draw from this magazine and would not need to recharge(reload) until the magazine was empty. (like burst of speed but a much longer timer than 10 seconds)
-rifle would be defaulted as modern military rifle with a quad rail on the fore end (for the shotgun, grenade launcher, and flamethrower)
-Cottage Rule be damned
Burst
Ranged, Moderate x3(Lethal), Foe -DEF -3 rounds (there would be an accuracy penalty)
Shot
Ranged, moderate DMG(Lethal), Foe -def -1 round
Undermount Shotgun
Ranged (Narrow Cone), Moderate DMG(Lethal), Foe Knockback (a rounds system would be cool for this too)
M30 Grenade
Ranged (Targeted AoE), Moderate DMG(Lethal/Smash), Foe Knockback (unchanged)
Extended magazine
Increases Magazine capacity to 30
Aimed shot
Sniper, Extreme DMG(Lethal), Foe Knockdown (name change and kd instead of kb) -1 round (maybe no fast snipe?)
Flamethrower
Ranged (Cone), Extreme DoT(Fire) (unchanged)
Additional Magazines
Reduces reload (recharge) time of all powers using "rounds"
Full Auto
Ranged (Cone), Superior DoT(Lethal), +Special (same, but with a faster animation)
-More stuff too