I would suggest against that.
An investment that would get you closer to the 100k kills needed to purchase the p2k, which is 100k gralats each, should be made instead of going outright pking with the AA-12. Experiment with weapons that you are interested in, and maybe you might change your decision on what you may want in the future because I guarantee that you are going to ask yourselves a couple of times if p2ks are worth it.
P2ks suck