Strike industries extended takedown pins and pivot pins are ideal for shooters looking for a custom look and that run multiple upper receivers off of a single lower. 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. Package Includes: – 1 x Extended Pivot pin – 1 x Extended Take down pin Features: – Eliminates the need for a pin punch. – Locks into place securely. – Quick Disassembly of the rifle. Note:  SI Extended Pivot Pins may not be a good fit for all billet receivers such as the AREA53 Mod 0 receivers (Third generation models are compatible).