KAK Industry K-Spec 13.90" Railed Upper 5.56x45mm 1:7 Mid-Length w/BCG&CH, Black
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KAK Industry
Overview
The KAK Industry K-Spec 13.90" Railed Upper is a complete upper receiver designed for AR-15 platforms, featuring a mid-length gas system that enhances reliability and reduces recoil for more manageable shooting. With a 1:7 twist rate, this upper accommodates a variety of bullet weights, making it suitable for both precision shooting and versatile applications. This upper is commonly found in builds focused on compact maneuverability while maintaining effective performance at a range.
Specifications
KAK Industry K-Spec 13.90" Railed Upper 5.56x45mm 1:7 Mid-Length w/BCG&CH, Black
Build history on GunPartPicker
Builders on GunPartPicker first added the KAK Industry K-Spec 13.90" Railed Upper 5.56x45mm 1:7 Mid-Length w/BCG&CH, Black to a build in March 2026.
It was hard to find in August 2026, in stock on only 6 of the 14 days we checked, and today the one retailer we track is out of stock. Prices barely moved in August 2026, holding around $599.99, so there haven't been real sales lately. Listed prices start at $599.99 at Brownells for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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