no real difference, I have a chest rig you can put a plate in, but that's modern real steel gear. The plate helps rigidity so it doesn't mush around when you pull mags out. PCs can be a lot hotter to wear in the summer, but if you're looking to keep it cheap to start, a surplus chest rig is like 20-30 bucks... you can game it till you decide you want something different, that way your investment is pretty low if you change your mind..or make up your mind on which way to go for gear.
best thing to do would be go to to your nearest surplus store and try some on. Oshawa and hero outdoors is not that far from you, they got great, helpful staff and you can try on a lot of the vests before you choose one.
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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