User-submitted image; UltiMAK enhanced M92 SBR underfolder with M15 optic mount and Holosun reflex sight.
UltiMAK user, “Tyler” Jones, had this to say:

Hey Ultimak Team!

Just wanted to let you know that your M15 fits a standard M92 handguard with no fitting necessary! It’s my second Ultimak product and a second win from you guys. Thanks for making awesome products that work!

Attached is some M92 SBR love for you!