I have for sale a NIB ProMag Ambidextrous Dual Loop Sling Attachment Plate. It allows a weapon to be worn on your right or left side and replaces collapsible 4- or 6-position butt stock retaining plates. The attachment plate attaches to a single-point sling and is made of black oxide carbon steel. Made in USA. I bought this a few months ago... and never even took it out of the box. Asking $12.