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Fortis Manufacturing
Overview
The Fortis K1 AR-15 Enhanced End Plate Castle Nut Combo is designed to provide a robust and reliable attachment point for your buffer tube, made from durable 7075-T6 aluminum for added strength. Its enhanced design ensures a secure fit while reducing the risk of loosening over time, which is particularly beneficial for builders focused on performance and longevity in their setups. This end plate is commonly found in builds featuring a mid-length gas system and chambered in 5.56 NATO, making it a practical choice for a wide range of applications.
Fortis K1 AR-15 Enhanced End Plate Castle Nut Combo, OD Green - LEBLKK1ODG
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Fortis K1 AR-15 Enhanced End Plate Castle Nut Combo, OD Green - LEBLKK1ODG was the sixth most added end plate on GunPartPicker in August 2026, behind the CMMG Ambidextrous Single-Point Receiver End Plate, Black, with about 2% of all end plates added to builds. That's its 2nd straight month at #6. Builds with this end plate are mostly chambered in 5.56 NATO (80%, then .223 Wylde 20%), mostly on carbine-length gas (67%, then mid-length 33%), and nearly all AR-15.
It was hard to find in August 2026, in stock on only 8 of the 16 days we checked, and today all 4 retailers we track have it in stock. The best price crept up from $37.95 to $41.49 over August 2026. Buying today, the lowest price is $37.95 at BattleHawk Armory, which matches the best price we saw in August.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 retailers
We ranked every end plate by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 End Plate Guide →The part most often added in each category by the 92 builds that include this one
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Aggregated and anonymized data showing how builders use this product
Builds in the community that include the Fortis K1 AR-15 Enhanced End Plate Castle Nut Combo, OD Green - LEBLKK1ODG
| Build | Parts | Total |
|---|---|---|
 | 23 | $1868.61 |
 | 23 | $1577.93 |
 | 27 | $1327.69 |
 | 28 | $1106.32 |
 | 24 | $931.53 |
 | 25 | $1051.26 |
 | 26 | $2635.36 |
1 global rating
Top reviews
Fortis K1 enhanced castle nut and end plate combo in OD green matches my Magpul OD parts. Lightweight castle nut has the bigger wrench notches for easier torquing. End plate has integrated QD socket. Would buy again.
