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Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System K1 Tapered Grey Castle Nut

Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System K1 Tapered Grey Castle Nut

Fortis Manufacturing · Buffer Tubes & Springs

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Best price

$39.99at OpticsPlanet

In stock Sale checked Oct 31, 2026

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Where to buy

StorePriceAvailabilityBuyAdd to build
OpticsPlanet Best price $39.99Salechecked Oct 31, 2026 In stock Buy at OpticsPlanet
Palmetto State Armory $37.99checked Oct 19, 2026 Check store Buy at Palmetto State Armory
MidwayUSA $37.95checked Oct 31, 2026 Out of stock Buy at MidwayUSA

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: $39.99 at OpticsPlanet. Dashed line = out of stock. Tracking since Oct 27, 2026.

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StoreLatestLowestHighest
MidwayUSA$37.95$37.95$37.95
OpticsPlanet$39.99$39.99$39.99

Since Oct 27, 2026.

About this part

The Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System K1 Tapered Grey Castle Nut is an AR-15 buffer part from Fortis Manufacturing. It's sold by 3 stores (1 in stock), from $37.95 to $39.99. The lowest in-stock price in the last 30 days was $39.99 at OpticsPlanet.

Specifications

Manufacturer
Fortis Manufacturing
Platform
AR-15

From the manufacturer

Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System K1 Tapered Grey 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-GRY: LE Lightweight Enhanced AR15 End Plate System K1 Tapered Grey Castle Nut

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$39.99 at OpticsPlanet
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