Great looking gun . . . I can see the bigger charging handle clearly from the Pic #2 angle. But hey, back to the original thread . . .
Madhouse, that piece is attached to the body of your 90 to an Urban.ERT sling and it's a cool setup. They are a sponsor on this forum and their site has a video to show just how versatile & fundtional they are (plug plug . . . Matt even has a sale going on right now . . . plug, plug). They have the same setup for the FS2000 and they do look great once installed. I have them both on my toys! To get them on perfect and snug, you can soak it on water, attach it wet, and let it dry. Wetting stretches it, and the drying tightens it up real snug (learned that technique on this forum).