Aegis AR-9 Pistol Full Build Kit with SBA5 Brace

The Aegis AR-9 is a complete pistol build kit designed for 9mm shooters who want a compact, controllable platform without the complexity of traditional submachine gun designs. This kit includes everything except the lower receiver: a 7.5-inch 4150 CrMoV barrel with 1:10 twist rate, freefloat M-Lok handguard, SB Tactical SBA5 stabilizing brace, bolt carrier group, charging handle, and all buffer system components. The 9mm flash hider threads onto the barrel at 1/2x36 pitch for muzzle control.

Key Features

• 7.5-inch 4150 CrMoV barrel with 1:10 twist for reliable 9mm cycling
• Freefloat M-Lok handguard reduces barrel harmonics and improves accuracy
• SB Tactical SBA5 stabilizing brace with nylon reinforced polymer construction
• Bolt carrier group in 8620 alloy steel with nitride finish for durability
• 5.5 oz buffer weight tuned for 9mm blowback operation
• 9mm A2 flash hider with 1/2x36 threading for muzzle control

Perfect For

• Shooters building a compact 9mm AR platform for home defense
• Pistol caliber carbine enthusiasts who prefer the AR platform
• Builders seeking a complete upper and lower system without the serialized receiver
• 9mm shooters who want a freefloat barrel for accuracy over short distances

Aegis Barrel and Freefloat Design

The 7.5-inch barrel length keeps overall dimensions compact while the 1:10 twist rate stabilizes standard and subsonic 9mm loads effectively. The freefloat M-Lok handguard isolates the barrel from external pressure, reducing barrel harmonics that can affect shot placement. This design choice matters because it means accuracy relies on the barrel itself rather than how tightly you grip the handguard. The anodized finish on both the upper receiver and handguard provides corrosion resistance without adding weight.

SB Tactical SBA5 Stabilizing Brace

The SBA5 brace uses nylon reinforced polymer construction to balance weight and durability. The brace mounts directly to the buffer tube and provides a stable platform for one handed or two handed shooting. The design allows the brace to contact your arm during firing, which is the intended use under current federal law. This brace is commonly paired with 9mm pistol builds because the lighter recoil impulse of 9mm makes the brace effective for rapid follow up shots.

Complete Kit Components

Lower receiver not included. The kit includes the upper assembly, bolt carrier group, charging handle, buffer tube, 5.5 oz buffer, recoil spring, castle nut, and end plate. All components are present to complete a lower receiver once you source a serialized 80% or finished lower.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included.