Heckler & Koch HK diopter rear sight SL7 others This is a HK diopter rear sight. This is not an airsoft replica piece. Very good overall condition as shown. Please see my other listings. Always satisfy yourself as to the safety of electrical items. Feedback – always appreciated and I always leave it. If you are dissatisfied after you receive your item, contact me BEFORE leaving feedback and hopefully I’ll sort it out to your satisfaction.