The A.R.M.S. #40 Stand Alone Flip-Up Rear Sight Black brings a proven, low-profile backup sighting solution to your rifle. Built around a spring-loaded rear aperture similar to the Swan Sleeve system, it snaps into position with repeatable zero and locks down securely when not in use, staying out of the way of optics until you need it.

This folding rear sight is designed for shooters who want a dependable, mechanical backup that holds zero through hard use. The quick-release locking lever keeps the sight folded until intentionally deployed, while the horizon line notch supports precise aiming at extended distances. With windage adjustments in 0.75 MOA increments, it is well suited for range work, training, and general-purpose rifle setups, reflecting A.R.M.S.’ long-standing reputation for durable, duty-ready sighting systems.

Key Features:

• Manufacturer: A.R.M.S.
• Model: #40 Stand Alone Flip-Up Rear Sight
• Color: Black
• Sight Style: Folding rear sight
• Material: Steel
• Item Weight: 0.425 lbs
• Windage Adjustment: 0.75 MOA increments
• Special Features: Spring-loaded flip-up design with locking lever and horizon line notch