I use the polymer one. Getting ready to replace the metal paratrooper stock with the RS Regulate adapter/Magpul zhukov stock. Got a side rail on there with an RS Regulate optics rail.Did you leave yours in beaverbarf or update it?
My handguard is nice but stupid heavy... Thinking of getting the polymer one the Czechs themselves use.
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I actually like the small side folding metal stock, but it is not conducive to using optics.