Looking for part number 987143 Screw, carrying handle mounting, long (34mm). The forward mounting screw that attaches the G36 dual optic to the rifle. Tried HK in Trussville, but they do not carry that part any longer. Any help would be appreciated, if you have run into this problem before and found one at the hardware store let me know. Prefer an HK part, but for all I know, they are getting them at the local hardware store too. Thanks.