Kriss USA DARSBL00 Defiance Rear Flip-Up Black AR-15 Low Profile Steel

Rear sight systems shape how quickly you acquire targets on an AR platform. The Kriss USA Defiance delivers a steel flip-up design that stays out of your way until needed, offering shooters from Pittsburg to the broader Bay Area a reliable backup option. Understanding your sight choices matters—review California firearm laws before purchasing.

Steel Construction and Low-Profile Design

This rear sight uses steel construction for durability under repeated deployment cycles. The low-profile footprint integrates cleanly with upper receivers and optic mounting systems without compromising sight radius. Whether you're maintaining an existing build or upgrading a platform, knowing how transfers work helps streamline your purchase. TacticCAL handles private party transfer process details so you focus on functionality. Flip-up sights serve as secondary aiming systems when primary optics fail or require backup. Browse our gun shop.

Frequently asked questions

Does this rear sight work with all AR-15 upper receivers?

The Defiance mounts on standard Picatinny rails found on most modern AR-15 uppers. Verify your rail system accepts standard rear sight mounts. Some free-floating handguards may require rail accessories for proper mounting.

How do I transition between this flip-up sight and a primary optic?

Simply flip the sight down when using a scope or red dot, keeping it ready as a backup. The low-profile design prevents interference with most standard optics, and you can deploy it quickly if your primary system fails during shooting.

What do I need to bring for DROS in California?

Bring a valid California driver's license or ID card, proof of residency, your Firearm Safety Certificate (FSC), and payment for the firearm and transfer fees. Looking for FFL dealer Concord? Visit us in Sunnyvale.