[quote name='Gamer SDP']I read that all unlocks can be used offline in split-screen and possibly private matches on live.
I also read that experience can be gained (and stuff unlocks like weapons, attachments, perks, etc) in offline split-screen. the experience gained however, is not stacked with the online experience.
now, I plan to mess around in private split-screen to learn the maps, level a bit and mess with weapons/attachments/perks/etc.
In the event that I reach level 70 in multiplayer and prestige, will I still have acess to all the offline unlocks? I ask since there is an option to have Live unlocks on/off in split-screen but not sure if only online is reset.
when unlocking attachments, do they unlock for a specific gun only or all types of that gun (assault rifle, smg or even all primary/secondary)?
oh and another question. are any of the default classes actually decent to use online? I'm close to leveling up and unlocking the ability to create classes but just want to know.[/QUOTE]
No clue about the offline / split-screen stuff. However, attachments are earned on a per gun basis. IE: a red dot unlock on a M4A1, won't also unlock it for other assault rifles. Same thing goes for secondaries as well. As for the pre-made classes, in my opinion they are pretty "meh". They're good enough, until you have the ability to create your own class, and start unlocking more guns // attachments, but to be honest, I wouldn't really use them much after that in the long run.
A lot of them have not so useful perks, or secondaries, etc. Granted, they do have some perks that you won't unlock till quite a bit later, but the ability to tailor a set up to your style, through create a class is a lot better - at least in my opinion. When I first started playing, I used the "Grenadier" class, with the Famas (three round burst). It is fairly decent, with stopping power, and can pretty much take down most people in one burst, and noob-tube is always lovely. But beyond that, I would definitely use create a class. Thankfully it unlocks pretty early, so you aren't stuck with the generic classes for long

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