FTLS™
The Foundation of Accuracy
The traditional AR-15 design relies on a threaded barrel nut to secure both the barrel and the handguard. This interface is susceptible to shift under impact, causing lasers and iron sights to lose zero.
The Solution: The FTLS™ Upper Receiver features a massive, monolithic forward extension—machined from the same solid block of 7075-T6 billet as the receiver itself.
MK66™ / MK1: Features a +0.075" increase in spine thickness for combat rigidity.
FTLS+™ (MK12): Reinforcement doubled to +0.15" spine thickness, with an additional +0.075" added to the trunnion diameter.
Accuracy requires absolute rigidity. The barrel bore inside the FTLS™ trunnion is machined slightly undersized.
To install the barrel, the receiver must be heated to expand the aluminum. Once the barrel is inserted and the receiver cools, it contracts around the barrel extension, creating a molecular-level interference fit. This eliminates harmonic vibration and thermal shift, ensuring the rifle shoots as a single, unified mass.
The handguard does not touch the barrel nut. Instead, it slides over the "Vault" extension and is bolted directly to the receiver via 11 radial screws.
This turns the handguard into a chassis. Impacts to the rail are transferred directly to the receiver, bypassing the barrel entirely. Your laser aiming devices remain true, regardless of barricade strikes or rough handling.
