What I mean is, that you can have a bunch of single-use things and the Pistol. After you use up the Grenades, the Pistol can still be used to fight off enemies who are using bigger, more powerful guns. The way I see it, you should be using a primary weapon, like a Machinegun, Shotgun, or Sniper Rifle, and have a Pistol for backup.
You encounter two players, both armed with Combat Shotguns. You fire everything you got from your Battle Rifle at them, and manage to kill one of two players in front of you and heavily damage the other. The second enemy player is quickly firing at you with his Combat Shotgun. You're hit many times and nearly dead, so you take your Pistol and finish off the Combat Shotgunner with two or three shots.
This Pistol would be too weak per shot to be used as a primary weapon, and doesn't have an amazing firerate, but has a very fast reload speed, so in case you do empty it, you won't be standing there for 2 seconds trying to reload.
Also, the Pistol in this pack does really high damage to vehicles. 2 shots to a MAS Swarm Fighter, 6 shots to a Biplane, 12 shots to a Jeep and Stunt Plane, 17 shots to a Tank, 28 shots to Jaydee's Bomber, and 56 shots to a Pelican.