New, never used black rubber dust covers for the M1 15 or 30 round magazines. These were manufactured in the Vietnam era and have been stored in a silicone impregnated atmosphere in a box since then. They are supple and have no crack. No degradation at all. These will protect your feed lips and keep gunk out of your mag, protecting it against failures and protecting your action from abrasive gunk.
If you need pics I can email them. These things in perfect working order. I am selling them in lots of 6 for $3.00 shipped. 12 for $5.00 shipped. Email me with your orders.