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4,107 Posts
Glad you're happy, but there's a whole big thread for this:
https://www.hkpro.com/forum/hk416-h...ku-hk-uppers-non-hk-lowers-photo-gallery.html
Also, the "OTB" is a whole list of criteria for this specification...one being drain holes in the proprietary receiver extension which has been replaced by aftermarket. Also, the "BF" uppers that @HKParts.net is selling as "OTB" lack the reduced chamfer on the chamber face for additional case support; one of many things flagrantly wrong with their misleading description.
https://www.hkpro.com/forum/hk416-h...ku-hk-uppers-non-hk-lowers-photo-gallery.html
Also, the "OTB" is a whole list of criteria for this specification...one being drain holes in the proprietary receiver extension which has been replaced by aftermarket. Also, the "BF" uppers that @HKParts.net is selling as "OTB" lack the reduced chamfer on the chamber face for additional case support; one of many things flagrantly wrong with their misleading description.