Daniel Defense RIS II M4A1 FSP Assembly, FDE, Govt.  Used on SOPMOD Block II rifles.  Brand new and still sealed in the foil bag. 

More pics at the link below. Pics showing one on my upper are just for reference.  The one I'm selling is sealed in the bag.

https://lensdump.com/a/pmags.A3efH

$350

FTF in Rochester, the southern Twin Cities metro area, and all points in between. 

Will ship.