Del-Ton AR-15 Heavy Rifle Kit 20" Barrel 1:9 Twist

The Del-Ton AR-15 Heavy Rifle Kit with 20" barrel and 1:9 twist is a complete upper assembly solution for builders who want a quality, mid-length gas system rifle without piecing together components from different sources. This kit arrives head-spaced and test-fired, ready to mate with a lower receiver (sold separately) and get to the range. It's built on mil-spec dimensions throughout, making it compatible with standard AR platforms and parts ecosystems.

The 20" heavy profile barrel is chrome moly vanadium with M4 feed ramps, chambered in 5.56 NATO, and topped with an A2 flash hider. That heavier profile means less whip and better harmonics for precision work—whether you're dialing in loads at 100 yards or stretching shots downrange. The 1:9 twist stabilizes a wide range of bullet weights, from 55-grain varmint rounds through 62-grain military-spec loads. Phosphate finish on the barrel sheds corrosion and doesn't require constant babying.

Inside, you get a bolt carrier group with a carpenter 158 bolt (HPT/MPI tested), phosphated 8620 steel carrier with mil-spec chrome lining, and a properly staked gas key. The upper is forged 7075 T6 aluminum with hard coat anodizing, A3 flat-top configuration, ejection port cover, and round forward assist. Standard rifle-length handguards with delta ring and heat shield keep your hands comfortable and your setup predictable. The kit includes a standard A2 buttstock with trapdoor assembly, so you'll have a complete rifle once you add a lower receiver and magazines.

This is a no-frills, proven platform: straightforward, reliable, and ready to work whether you're building your first AR or adding another upper to your safe.

Key Features

• Complete upper assembly, head-spaced and test-fired before shipping
• 20" heavy profile chrome moly vanadium barrel with 1:9 twist for broad bullet compatibility
• Standard rifle-length gas system optimized for reliability and controllability
• Mil-spec bolt carrier group with HPT/MPI tested carpenter 158 bolt
• Forged 7075 T6 aluminum upper receiver with hard coat anodize and A3 flat-top
• A2 flash hider and reinforced A2 buttstock included
• Phosphate and chrome-lined components resist corrosion
• Compatible with standard AR-15 lower receivers

Specifications

Frequently Asked Questions

What do I need to complete this AR-15 kit into a rifle?

You'll need an AR-15 lower receiver (which is the regulated part in the US) and magazines. This kit includes the complete upper assembly, bolt carrier group, handguards, buttstock, and lower parts kit, so once you add the lower receiver and mags, you have a complete rifle.

Is this kit suitable for long-range or precision shooting?

The 20" heavy profile barrel is a solid choice for precision work. The heavier profile reduces barrel whip and supports more consistent harmonics, and the 1:9 twist is versatile across a wide range of .223/5.56 ammunition weights. That said, a flat-top upper with A2 buttstock is a general-purpose platform; dedicated match rifles often use different ergonomics.

What ammunition does the 1:9 twist stabilize?

The 1:9 twist is designed to handle the common range of 5.56 NATO and .223 Remington loads, including 55-grain varmint rounds through 62-grain military-spec ammunition. It's one of the most versatile twist rates for the cartridge.

Is the upper receiver compatible with standard AR-15 parts and accessories?

Yes. The upper is mil-spec and will work with any standard AR-15 lower receiver. The A3 flat-top configuration accepts Picatinny rail optic mounts, and the rifle-length handguard with delta ring is compatible with standard furniture and rails designed for that platform.