The A.R.M.S. ARMS Low Profile Flip Up Rear Sight #40L is a compact, rugged backup sight designed for flat-top rifles that need maximum clearance for optics. Building on the proven #40A2 design, this rear sight uses a lower profile body and a miniaturized windage knob with precise 0.75 MOA adjustments, along with a unique dual aperture for flexible sighting options.

This flip-up rear sight leans slightly to the rear so it folds in the correct direction if dropped, helping it maintain zero and reliability over time. Its extremely low folded height of just 0.610 inches makes it ideal for rifles that run magnified scopes or red dots, offering a clean, unobtrusive backup aiming solution for range use, training, and general shooting. The thoughtful engineering reflects A.R.M.S.’ long-standing reputation for durable, well-executed firearm accessories.

• Manufacturer: A.R.M.S.
• Model: #40L Low Profile Flip Up Rear Sight
• Unique Features: Low profile design, 0.75 MOA windage adjustment, dual aperture, rear-folding configuration, 0.610" folded height
• Category: Iron Sights
• Type: Flip-Up Rear Sight
• Windage Adjustment: 0.75 MOA
• Aperture: Dual Aperture