1. They aren't hackers, just they are good. Spray it means prefire, shooting on walls/boxes/any items without any proofs there is someone. Like u hear ghost and shoot around u. This means spray.
2. Both are good.
• AK-47 S - Huge Power, but high recoil. Good weapon, but hard to use for choobs. U need to get skill to be great.
• Same as m4a1 Adv, average power, low recoil. Easy to use as standard m4a1.
If u are new I prefer m4a1 Silver for u, but if u got skill in default AK-47, try it.
3. Main weapons in BM are permament, the rest are some kind of gifts for X Days. So if u choose any Gun in BM, it's permanent. BM it's all luck, so there aren't here any tricks/glitches etc. Just need to have luck, and give ur life to fate.