Radical Firearms Complete Upper Assembly - .223 Remington, 16" Barrel, M-LOK Handguard
Radical Firearms
The Dickinson Arms DD5 V3 7.62x51mm upper receiver assembly is a purpose-built upgrade component for shooters who demand accuracy and reliability from an AR-pattern rifle chambered in .308 Winchester. Whether you're modifying a DD5 V1 or V2, or adding a caliber variant to a V4 or V5 platform, this 16-inch M-LOK tactical rifle upper delivers the mechanical precision and durability that serious hunters and precision riflemen expect. Cold hammer-forged construction paired with Dickinson Arms' innovative 4-bolt connection system creates the barrel-to-upper interface rigidity traditionally reserved for bolt-action builds, translating to tighter shot groups and consistent performance across varied shooting conditions.
The upper assembly ships fully configured: a user-adjustable gas block lets you dial in reliable operation whether you're running suppressed or shooting unsuppressed, eliminating the guesswork and retuning that plagues many modular uppers. The bolt carrier group—superfinished and DLC-coated—features enhanced extractor geometry and dual ejectors for rock-solid feeding, with an integrated buffer that smooths out recoil impulse for faster target reacquisition. The 16-inch S2W profile barrel strikes the practical balance between sight radius and maneuverability, ideal for mid-range hunting, tactical training, or precision shooting out to intermediate distances.
Built entirely in the USA, the DD5 V3 combines CNC-machined 7075-T6 aluminum construction with chrome-lined, cold hammer-forged barrel steel and a Daniel Defense Superior Suppression Device muzzle brake. The included DD5 M-LOK rail provides modern accessory mounting flexibility without the weight penalty of Picatinny. The GRIP-N-RIP ambidextrous charging handle incorporates anti-gas venting, reducing blowback and keeping your face cleaner during extended shooting sessions. At 5.9 pounds, this upper remains lean enough for hunting while offering the accuracy capability and component quality you'll rely on for years.
| Caliber | 7.62x51mm / .308 Winchester |
| Barrel Length | 16 inches |
| Barrel Profile | S2W (Strength-to-Weight) |
| Barrel Twist | 1:11" |
| Barrel Construction | Cold Hammer Forged DD Proprietary Steel, Chrome Lined, Mil-Spec Heavy Phosphate Coated |
| Gas System | Intermediate Direct Impingement, User-Adjustable Gas Block |
| Upper Receiver | CNC Machined 7075-T6 Aluminum, Type III Hard Coat Anodized |
| Handguard | Daniel Defense DD5 Rail 15.0", 6061-T6 Aluminum, M-LOK |
| Gas Block | CNC Machined 4140 Hardened Steel, Mil-Spec Heavy Phosphate Coating |
| Bolt Carrier Group | Superfinished, DLC-Coated, Integrated Buffer |
| Muzzle Device | Daniel Defense Superior Suppression Device, 17-4 PH Stainless Steel, Salt Bath Nitride Finished |
| Charging Handle | GRIP-N-RIP Ambidextrous, Anti-Gas Venting |
| Weight | 5.9 lbs |
| Mounting System | M-LOK |
Yes, the DD5 V3 is backward compatible with DD5 V1 and V2 platforms, making it a straightforward upgrade path if you already own an earlier generation DD5.
Absolutely. The user-adjustable gas block allows you to fine-tune operation for suppressed fire, ensuring reliable cycling whether you're shooting suppressed or unsuppressed without the need for additional tuning or replacement parts.
The barrel features a 1:11" twist rate, which is the standard Dickinson Arms specification for the DD5 V3 in 7.62x51mm.
The complete upper assembly includes the machined upper receiver, cold hammer-forged barrel, bolt carrier group, adjustable gas block, M-LOK handguard, GRIP-N-RIP charging handle, and Daniel Defense Superior Suppression Device muzzle brake.