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The gen 2 design is a good proven design. It also appears to be "fixable" in the event that you do tear/dry out that oring. All the other sealing parts are stubby little orings around screws...that's good. They work.
This design has been in use with all sorts of GBB mags for years. Hicapas, 226, etc...
The only odd thing of the Gen 2 M4 mags vs. the VN mags is that cross pin screw that holds the nut that the main screw screws into. Other mags have the nut molded into the upper half. That's good in a sense since if you strip out the molded part your mag is done...it's bad in a sense that it puts a hole into the side of the mag. It's sealed up well...but still.
The big upside of this two half design is that one screw pulls the two parts together and tightens up on the seal evenly. If the seal shrinks (and it's using a pretty thin oring...so it could be better) then you just tighten it up more. Not going to use your mag for a long while...loosen the screw to let the seal relax. Seal is blown...get an appropriate sized oring (great that they didn't use a weird rectangle/box seal) and replace it.
I've sealed a lot of mags...I've resealed more than a few. Even after you seal them you'll end up with bits of sealant or a thin coating of silicone/something on everything. I'm sick of dealing with it.
I'd get the kits if there were no issues with the fill valves/knockers/feed lips/top seals. But if you suspect that your valves or other parts are too gummed up/busted then I'd buy a new mag. Airsoftparts.ca is getting a big shipment in soon and they'll be about as cheap as you're going to get anywhere.
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