Ra-Tech Magic Pin M4/M16 GBB

Magic hex head bolt for M4/M16 series GBB airsoft guns. Instead of a normal bolt, the three-piece bolt tightens inside the frame, wedges tightly into place, thus making the upper and lower frame fit solid and preventing the frame bolt from falling out even when going hard. Compatible with, among others, G&P / WE / KJ / Inokatsu brands of M4/16 series gas blow back (GBB) guns.