Is modern day slide fire stock still just $300? I would think they got high with everything else, but I haven't looked.
I still see them for $360 for an AR and $299 for the AK.
The FosTech stock I ordered was $600 all done but I bought the left handed attachment so that I can swap it out if I want to share with friends (not just yet though). (That one's going on a bigger gun)
With Slidefire's plastic you are locked into one handedness. That's great if you are a righty; not so great as a lefty.