I'm a fan of Troy BattleSights myself...
Troy Industries BattleSights
I run a rear folding Di-Optic with a front M4 style folding BattleSight combo on my midlength build...
Rear Folding Di-Optic BattleSight
Troy BattleSight Rear Folding Di-Optic Aperture (DOA)
Advanced design, superior sighting and battle-ready toughness define Troy Industries’ Di-Optic Aperture (DOA) Folding Rear BattleSight.
These sights provide lightning fast target acquisition and are manufactured to exceed military specs. The optically engineered apertures center your eyes instantly and effortlessly providing a clearer target picture than with round apertures.
The sights feature two settings, one for up to 300 meters and a second for up to 500 meters. This versatility makes the DOA ideal for military, law enforcement and home defense applications. These advanced sights have been extensively field-tested and, like all Troy Industries products, are Battle Ready.
Note: Sight is designed to work on same plane rail systems only. Will not work with a railed gas block that is higher or lower than the receiver.
Features
•Faster target acquisition with Di-Optic Aperture
•Increases accuracy to 550m
•Quick install, easy adjust
•0.460″ profile when folded
•Protected adjustment wheel
•Dual same plane aperture .50 MOA per click
•Aircraft aluminum 6061 & stainless steel
•Type III hard coat w/ black oxide or Flat Dark Earth finish
Front M4 Folding BattleSight
Troy BattleSight Folding Front M4
Durability and dead-on accuracy have made Troy Industries Folding BattleSights the hands-down choice of Special Ops and tactical users worldwide. Easy to install and to deploy, with no levers or springs to fumble with, these sights position apertures at exact factory height. A stainless-steel cross-locking system ensures sights remain upright and zeroed under extreme combat conditions. A push of a button folds the sights securely out of the way until you need them again (they fold to a profile of just 0.460). Troy BattleSights feature a zero-canting attachment system for use on all military and aftermarket receivers.
Durability and dead-on accuracy have made Troy Industries M4 Front Folding Sights the hands-down choice of Special Ops and tactical users worldwide.
Features
•No tools are required for adjustment
•Each click equals .50 MOA of adjustment
•Blackened Stainless Steel
•MIL-SPEC Type III Hard Coated
•T6 Aircraft Aluminum construction
•Available in Black and Flat Dark Earth
•Will not work on railed front gas block mounted lower than receiver height
•Made in the USA
*** The BattleSights also come in Tritium for use in low light conditions...
Troy Industries Tritium BattleSights