AR-15 Adjustable Receiver Link- Never have issues with keeping your AR upper and lower in the open position. The Adjustable Receiver Link keeps your AR open for cleaning and repair. The upper link utilizes the receiver pin to stay secured. Two threaded links are included, one short and one long. The shorter link at 1.2-1.5 inches allows the gun to be open enough to insert a bore guide. The longer link extends the opening from 1.4-1.8 inches. All three components are made of a corrosion resistant steel. Made of corrosion resistant plated steelComes with: One upper linkTwo threaded lower links