Strike Industries SI-Enhanced Pivot Takedown Pins Black One Size. Made out of Precision-Machined Steel. This is a replacement for the standard AR15/M16/M4 takedown pins and fits most of AR standard and billet receivers. Specifications for Strike Industries SI-Enhanced Pivot Takedown Pins: Manufacturer: Strike Industries Condition: New Fabric/Material: Precision-Machined Steel Gun Make: AR Platform Quantity: 1 Gun Model: AR-15 Features of Strike Industries SI-Enhanced Pivot Takedown Pins Eliminates the need for a pin punch. Locks into place securely. Quick disassembly of the rifle. Package Contents: Strike Industries SI-Enhanced Pivot Takedown Pins 1 x Extended Pivot pin 1 x Extended Take down pin What firearm models does the manufacturer say Strike Industries SI-Enhanced Pivot Takedown Pins is compatible with? The manufacturer says that Strike Industries SI-Enhanced Pivot Takedown Pins is compatible with AR-15 M4 M16Strike Industries SI-AR-EPTP-BK: SI-Enhanced Pivot Takedown Pins Black One Size