Actually, there are several combinations of fixed, folding sights that HK manufactures. All of which are on order with HK currently. As of now...the folding rear sight that is available is for use with the 33mm folding front sight and the 28mm is for use with the fixed rear diopter sight only. As the options arrive from Germany, I will have them noted and listed on hkparts.net for reference and for sale.
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