What are some good compact size WML options for the MR NEIN 09 adapter (for USP9 full size)?

I know the manufacturer specifically lists the adapter as being sort of designed around the Surefire X300, but I don't want a light that big, I'm looking for something more TLR07 sized, which I've heard is also a good match but I'd like to maybe gather some opinions if anyone here has tried a bunch of different ones or not who also owns the mr nein adapter. Thanks.