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.

Strike Industries Steel Extended Pivot and Takedown Pins for AR GBB Rifle (Gold)
Eliminates the need for a pin punch.
Locks into place securely.
Quick disassembly of the rifle.