Simple idea, ain't new, exciting, or groundbreaking.
When a weapon pack is made, give the option to by the weapons separately. Example: I really liked the Malmer and Olsson from the power pack (those reload animations are incredible) but I didn't care for the Tsurugi. I'd gladly pay like 2.00 each for the weapons i want in my game.
You don't need to break up the pack, just add the option. I posted two single weapon ideas already : #1145505200161968241 and #1145544128864727070 Add a third, and sell them as a pack if you want just add the option to buy a weapon all by itself. Somebody likes the 416 and hates the 270, they can get what they want. All three in a bundle for the same price as any dlc, or 2 bucks if the consumer wants to pick and choose