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Wow that is a big price jump. Are the aftermarket ones reliable?

Hi all, What's the deal with the factory last round bolt hold open version? Are they avliable new? The factory sales rep is "unsure". I search and I just can't seem to find a definitive answer. Who is making an aftermarket one? The aftermarket ones google finds me are sold out/or have 20 pages of posts trying to make then work. Any suggestions or ideas? Thanks for all your help.