Fortis K1 Enhanced AR15 End Plate, Flat Dark Earth
Fortis K1 lightweight castle nut and end plate system eliminates backing out without staking. Precision-engineered tapered design seats securely at just 0.59 oz. Available in Flat Dark Earth anodized finish.
Fits: AR-15
Fortis K1 Enhanced Castle Nut & End Plate System
Fortis Manufacturing has engineered a solution to one of the AR platform's most persistent problems: castle nuts that back out under recoil. The K1 system represents a departure from traditional staking methods and set screws.
How It Works
The K1 features a tapered castle nut that seals itself directly onto the end plate. This ultra-precision fit creates a mechanical lock that holds the nut in place without requiring:
- Staking or peening
- Set screws
- Ratcheting tools
- Additional hardware
Key Features
Lightweight Design At just 0.59 ounces (16.8 grams), the K1 system adds minimal weight to your rifle while delivering maximum security.
Precision Engineering The tapered geometry ensures the castle nut seats and seals itself into place through mechanical interference alone. Once installed, it remains locked without backing out or failures.
Durable Finish Anodized Flat Dark Earth coating provides corrosion resistance and a professional appearance that complements modern AR builds.
Installation
Simply install the tapered castle nut onto the end plate—the precision fit handles the rest. No special tools, no staking, no guesswork. This is engineering that works.
Features
- lightweight design at only .55 oz / 16.8 grams total
- castle nut and end plate are 7075 t6 aircraft grade aluminum
- quick detach socket - 360º rotational locking interface
- no set screws or ratcheting system
- made in the usa
