I just use an open ended generic and it works pretty well. Either way the draw is extended obviously.
I have the same setup with the FN 502. I absolutely love that combo.Not a great pic but we were moving fast.
It's a shooter. I killed my cow early this year so hiking with my wife I ended up just stuffing that whole thing across my bino harness (not chambered of course) and shot a couple more grouse with it while we tried getting her a bull. Sitting down with that suppressor on and pistol in a holster was not terribly comfortable and kept dragging it on brush, in the bino harness straps it worked out much better.I have the same setup with the FN 502. I absolutely love that combo.