Original US Army M16A1 buffer spring, mint condition in carboard tube. This is the spring only- NO buffer!
I have three available, not all tubes have tags/ stickers.
 
NOTE! This is being sold as collectable with no guarantee it will work in a firearm. Parts must be inspected and tested by qualified and competent gunsmiths or armorers before use in a firearm. Not all firearm parts are interchangeable; use of surplus parts without proper knowledge could cause a firearm to malfunction and cause property damage, injury or death. No overseas shipping.