Fortis K1 castle nut and end plate combo in gray is a unique color option. The lightweight castle nut is hollowed out which saves a couple grams. End plate has the integrated QD point. Took the standard AR15 wrench just fine, torqued to spec.

Fortis Manufacturing
Overview
The Fortis Light Weight K1 Castle Nut and End Plate is designed from 7075-T6 aluminum and features a hardcoat anodized finish for added durability. This enhanced type castle nut and end plate set provides a secure attachment point for the buffer tube, ensuring stability during operation and minimizing slippage. You'll often find this product in builds utilizing a mid-length gas system chambered in 5.56 NATO, making it a practical choice for those configurations.
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Builds in the community that include the Fortis Light Weight K1 Castle Nut and End Plate Black, Gray - LEBLKK1GRY
| Build | Parts | Total |
|---|---|---|
![]() | 18 | $1176.15 |
![]() | 21 | $2961.37 |
![]() | 24 | $3776.20 |
![]() | 35 | $3200.74 |
![]() | 29 | $4905.20 |
![]() | 18 | $2072.04 |
![]() | 16 | $1231.10 |
![]() | 20 | $1523.37 |
![]() | 27 | $2159.30 |
![]() | 22 | $1370.90 |
2 global ratings
Fortis K1 castle nut and end plate combo in gray is a unique color option. The lightweight castle nut is hollowed out which saves a couple grams. End plate has the integrated QD point. Took the standard AR15 wrench just fine, torqued to spec.
Fortis K1 lightweight castle nut and end plate in gray is a unique color option. Castle nut has the larger wrench notches for easier torquing. End plate has integrated QD socket. Anti-rotation flange seats correctly. Gray accents work well.