I’m not sure if these folks have been discussed before but I know a lot of people have a hard time finding this part. Here is the link.

https://www.jmac-customs.com/sig-552-556-hg-retainer/

Update: Super quick shipping. I got the piece on today and it looks great. It’s very sturdy and the finish is nice. Once I had it on the assembly and reinstalled the gas block, It was a very snug fit on the back side of the gas block and needed a little encouragement from a wooden block to fit in. Better that than loose.

This message has been edited. Last edited by: Accomplice,

He was only doing a run of 50 since he needed one for his postie so if you need one, don't hesitate.