Fixed rear sight with a fold down aperture. Exist?

[THEJAPINO]

Hi guys, I'm doubting a rear sight like this exist but here it goes anyway. Is there a fixed rear sight that has a fold-down aperture? I like how the fixed LMT rear sight looks like a hacked-off carry handle and I like how Magpul's MBUS Gen 2 has the fold-down aperture. Is there a sight that incorperates these two features? I understand that a typical fold down sight is the solution of this problem but I don't plan to add a scope with a large bell, just a micro-dot. The Daniel Defense fixed sight looks good also. Thanks

[GMG]

Is this the type your talking about ?

http://www.amazon.com/Mil-Spec-Back-Iron-Sight-ranging/dp/B002E6SXN4/ref=cm_cr_pr_pb_i

[1911ShooterPhil]

I don't know if this is exactly what you are looking for, but it is a picatinny rail with a foldng rear sight built into it. And it's ROCK solid...

http://shop.hahn-precision.com/BUIS-Riser-APRB0406.htm

Cool thing is, you can mount your red dot and all other accessories on top and the rear sight flips up to give you a lower 1/3 co-witness. Cheers! --1911ShooterPhil