Davidson Defense Passage SBR Ready 10.5-inch Carbine-Gas 5.56 NATO AR-15 Drop-In Handguard Pistol Full Build Kit

Passage SBR Ready 10.5-inch 5.56 NATO AR-15 Full Build Kit

The Passage SBR Ready Full Build Kit is built around a 10.5-inch front sight base barrel chambered in 5.56 NATO, paired with a 7075-T6 aluminum upper receiver finished in black anodizing. It pairs a carbine-length two-piece drop-in handguard with an A2 GI-style birdcage flash hider at the muzzle, running on a carbine-length gas system. A complete USA-made bolt carrier group, Mil-Spec charging handle, complete Lower Parts Kit, and carbine buffer-system components are all included. The lower receiver is not included, and this SBR Ready version ships without a brace.

Key Features

• SBR Ready design
• 10.5-inch 5.56 NATO barrel with front sight base configuration
• Carbine-length gas system with stainless steel gas tube
• 7075-T6 aluminum upper receiver, black anodized finish
• Carbine-length two-piece drop-in handguard, round seven-hole M4/CAR-15 profile
• A2 GI-style birdcage flash hider
• Complete Mil-Spec Lower Parts Kit and carbine buffer-system components included
• Lower receiver is not included.

Barrel and Front Sight Base

The barrel runs 10.5 inches long, chambered in 5.56 NATO and built in a front sight base configuration rather than a low-profile gas block setup. Mounted on it is a fixed A2-style front sight base, fitted with USA-made steel components including the front sight post, plunger, and spring. Gas cycles back to the action through a carbine-length system, running a carbine-length stainless steel gas tube.

Upper Receiver and Handguard

The upper receiver is machined from 7075-T6 aluminum and finished in black anodizing, cut with M4 feed ramps for smooth feeding and fitted with an AR-15 forward assist assembly. The ejection port carries a standard .223/5.56 door with its rod and spring installed. Over the barrel sits a carbine-length two-piece drop-in handguard in a round, seven-hole M4/CAR-15 skinny profile, finished in black with a single internal heat shield to help manage barrel heat. It mounts using a Colt AR-15 delta ring assembly.

Muzzle Device

Capping the muzzle is an A2 GI-style birdcage flash hider, threaded to match the barrel's 1/2x28 pattern and secured with the included 1/2-inch black crush washer.

Bolt Carrier Group and Charging Handle

A complete USA-made AR-15 bolt carrier group is included, listed for use across 5.56 NATO, .223 Remington, .300 Blackout, and .350 Legend. That broader listing describes the BCG itself; the barrel and chambering on this build remain 5.56 NATO. A Mil-Spec AR-15 M4 charging handle rounds out the upper's operating components.

Lower Parts Kit and Buffer System

A complete Mil-Spec AR-15 Lower Parts Kit covers the fire-control and lower-control internals needed once a lower receiver is on hand. Behind it sits a Mil-Spec heavy-duty six-position buffer tube, holding a standard AR-15 carbine buffer weighing 3 ounces and a standard USA-made recoil spring. An AR-15 carbine castle nut and Mil-Spec AR-15/M16 receiver end plate secure the buffer tube assembly to the lower.

SBR Ready

This Passage kit is configured as SBR Ready, which means it ships without a brace so the buyer can select their own final setup. The included component list above reflects exactly what ships with this kit, and it should be reviewed as supplied when planning the completed build. The lower receiver and any furniture selection remain the buyer's responsibility, separate from what's included here. The SBR Ready designation applies specifically to this configuration of the Passage.

Follow all manufacturer instructions and safe handling practices.

Ensure compliance with all applicable federal, state, and local laws.

Lower receiver is not included.

Ships without a brace.

Do not attach a stock unless the resulting configuration complies with all applicable federal, state, and local laws.