never shot one with a stock like 4, but the factory stocks like #2 are just masochistic. It's beyond unpleasant to the point of making you NOT want to shoot, at least for me. Factory fixed stock all the way, unless a magpul or msg fell into my lap.
It's a big long heavy thing, but hey- you can drop two pins and take the stock completely off if it won't fit in your trunk/bag/case/whatever. Like Austin said, your lack of cheek weld with those will really hurt your shooting... unless you get super custom and stick a massive riser on there.
no homo.