I bought some 10 rd. H&K mags from CDNN for my P2000 .40 . I tried to take the floor plates off and I can't get them to come off. I can remove the ones off of the 12rd mags . The button on the 10 rd mags that you depess has an X on them . Has anyone had these apart ? I don't want to damage them just to clean them. Thanks for any info .