The Rock River Arms All Terrain Hunter Complete Upper, 223 Wylde, 18-inch Stainless Heavy Match Barrel, 13-inch M-LOK Handguard (brand part number AR0598.V1) is a precision hunting and range upper built by Rock River Arms. The 223 Wylde chamber safely runs both 5.56 NATO and .223 Remington while holding tighter tolerances for better accuracy, and the 18-inch heavy match stainless barrel gets a cryogenic treatment to improve accuracy and extend service life. An RRA Operator muzzle brake tames recoil for faster follow-up shots, and a forged A4 receiver pairs with a 13-inch extended lightweight M-LOK handguard for a well-balanced, accessory-ready build. It ships complete with a bolt carrier group and charging handle installed, ready to drop onto any mil-spec AR15 lower.

Key Specifications

• Chambered in 223 Wylde, safely running both 5.56 NATO and .223 Remington with tighter accuracy.
• Barrel length measures 18 inches for extended range performance.
• Barrel is a heavy match-profile stainless steel, cryogenically treated for accuracy and barrel life.
• Twist rate of 1:8 inches stabilizes a wide range of bullet weights.
• Upper receiver is forged A4 aluminum.
• Muzzle device is an RRA Operator muzzle brake threaded 1/2×28.
• Gas system uses a low-profile gas block.
• Handguard is RRA’s 13-inch extended lightweight free-float M-LOK rail.
• Ships complete with a bolt carrier group and charging handle installed.

Frequently Asked Questions

What is 223 Wylde? A hybrid chamber that safely runs both 5.56 NATO and .223 Remington with tighter tolerances for better accuracy.

Does this upper include a bolt carrier group? Yes, it ships complete with a bolt carrier group and charging handle installed.

What muzzle device is installed? An RRA Operator muzzle brake threaded 1/2×28.

Buy the Rock River Arms All Terrain Hunter Complete Upper, 223 Wylde, 18-inch Stainless Heavy Match Barrel, 13-inch M-LOK Handguard

Build an accurate hunting or range rifle with an AR15 upper ready to drop onto your lower. Order it from our Lubbock, Texas gun shop, and our team will get it ready to ship as soon as it’s available.