[Slodin]

I'm thinking to buy a used P90, and there are two sellers
I read the P90 101, nice info. However, I never understood why to stay away from the sportline. (On google I found someone saying they have the same internals)

1. P90 sportline TR (owner doesnt seem to know if it is proline or sport):
extended barrel + silencer (which comes with the proline???)
3 mid-cap mags, 1 high cap (ignored hicap..)
9.6v Battery
Selling me for 225

2. P90 Proline TR
MADBULL 6.03 tight bore inner barrel
Systema high speed gears
Systema M120 Spring
4 mid-cap, 2 hi cap
9.6v 1600mah
extended butt stock
2x double mag pouch
selling me for 330

Of course I'm looking at it, and that PRO line is by far the best deal. Although all that internal upgrades I won't be able to know at all because I have no idea about internals. If those are real upgrades, then it would be nice for 330.

ATM I own an AK74 full metal. Reason why I'm going for P90s now is that the AK74 is too heavy to carry around for long hours since I injured my back when I was working for a moving company a year ago.

I just wonder whats your thoughts? I'm conflicted about cheap prices or better deal but spend a bit more.