Heckler & Koch MR556 Gas Block Retaining Pin

Always nice to be able to get factory parts.

Okay, but I highly recommend using a roll pin starter punch since these are easy to drive in using just a 3/16” roll pin punch or crazy enough think a normal pinch of no starter roll pin punch isn’t available since the roll pin punch can’t sit centered and ends up causing the very outside of the roll pin to sit off centered so really about 85% of the center of the pin is properly driven while the outside is just forced in and doesn’t sit flush as the center is driven in a little more than the outside of the roll pin. It for sure will hold, no problem, but if you want flawless work then you need both a 3/16” roll pin starter to drive the pin most of the way and a roll pin punch 3/16” to drive it home(or normal punch would probably work better for this one roll pin size). Came out fine in the end, but did bend up the driven end of the roll pin a little so that it left bare metal exposed so I recommend buying a starter roll pin punch in this huge size I dudnt have/ever needed for any of my AR and GLOCK builds.