The Ergo 4085 Gapper Black Rubber Fits AR-Platform Fits M4 is a compact comfort upgrade designed specifically for AR-15, AR-10, and M4 style rifles. This solvent-resistant rubber insert snaps into the open space between the trigger guard and pistol grip, smoothing out sharp edges and giving the lower receiver a clean, finished look. Installation is tool-free, relying on a secure friction fit that keeps the Gapper in place during regular use and cleaning.

This small accessory makes extended range sessions more comfortable by cushioning your knuckle and preventing abrasion to your trigger finger as you work the rifle. Because it only fills the trigger-guard gap, it does not interfere with your grip, trigger pull, or existing controls, making it ideal for training, recreational shooting, and general rifle use. Backed by Ergo’s reputation for thoughtful ergonomics and durable materials, the 4085 Gapper is a simple, effective enhancement for any AR-platform lower.

Key Features:

• Manufacturer: Ergo
• Model: Gapper
• Color: Black
• Material: Rubber
• Firearm Fit: AR-15, AR-10, M4
• Product Type: Lower Accessories
• Weight: 0.01–0.015 lb (approximate)
• Dimensions: 4.2" × 2.1" × 0.4"