Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System K1 Tapered Blue Castle Nut
Fortis Manufacturing · Buffer Tubes & Springs
No ratings yetBest price
$37.95at OpticsPlanet
In stock Sale checked Nov 10, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| OpticsPlanet | $37.95Salechecked Nov 10, 2026 | In stock | Buy at OpticsPlanet |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Price history
Lowest in-stock price in the last 30 days: $37.79 at OpticsPlanet. Dashed line = out of stock. Tracking since Oct 27, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| OpticsPlanet | $37.95 | $37.79 | $37.95 |
Since Oct 27, 2026.
About this part
The Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System K1 Tapered Blue Castle Nut is an AR-15 buffer part from Fortis Manufacturing. One store lists it, OpticsPlanet at $37.95. The lowest in-stock price in the last 30 days was $37.79 at OpticsPlanet.
Specifications
- Manufacturer
- Fortis Manufacturing
- Platform
- AR-15
From the manufacturer
Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System K1 Tapered Blue Castle Nut. With two lockdown systems (K1 and K2) we've engineered a solution to install the castle nut onto the end plate that is not only robust but also stands true to brand of innovation and ingenuity. The K1 system features a tapered castle nut that seals itself onto the end plate. This ultra precision snug fit allows the castle nut to seat and seal itself into place without the need of staking the end plate. No ratcheting no set screws no backing out and no failures. All of these features at only .59 oz / 16.8 grams No torque wrench required just tighten about 1/4 turn from hand tight. If using a torque wrench be sure to only use 15-20 ft lbs - this is much less than ytypical castle nut Specifications for Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System: Manufacturer: Fortis Manufacturing Finish: Milspec Anodized Fabric/Material: 7075-T6 Aircraft Grade Aluminum Hand: Ambidextrous Gun Make: AR Platform Gun Model: AR-15 Weight: 0.55 oz Quantity: 1 Condition: New Features of Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System Lightweight design at only .59 oz / 16.8 grams total Quick Detach Socket - 360 degree rotational locking interface No set screws or ratcheting system Package Contents: Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System What firearm models does the manufacturer say Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System is compatible with? The manufacturer says that Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System is compatible with AR-15Fortis Manufacturing LE-BLK-K1-BLU: LE Lightweight Enhanced AR15 End Plate System K1 Tapered Blue Castle Nut
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