I've got a SOLGW 11.5" upper with an A2 FSP. Came with a Magpul SL handguard, which I'm not crazy about, but it works. I've been looking at options for an mlok handguard (not really interested in a quad rail) that will drop in and work with the delta ring. So far I've come across a few, and have my options whittled to either a midwest industries or the centurion c4. Anyone have any experience with either? Other options worth considering?