This Rock River Arms 350 Legend complete upper (brand part no. 350L0326) pairs a 16-inch cryogenically treated stainless barrel with a forged A4 upper receiver and a 13-inch M-LOK free-float rail, ready to drop onto a compatible AR-15 lower.

Key Specifications

• Chambered in .350 Legend.
• Forged A4 upper receiver.
• 16-inch stainless steel barrel, cryogenically treated.
• 1:16 twist rate.
• RRA Operator muzzle brake, 1/2-36 thread.
• Low-profile gas block, carbine-length gas system.
• 13-inch extended, lightweight, free-float M-LOK handguard.
• Includes a bolt carrier group and charging handle assembly.
• Includes one 10-round magazine.

Frequently Asked Questions

What’s included with this upper? A bolt carrier group, charging handle assembly, and one 10-round magazine, in addition to the barreled upper itself.

Does the barrel length raise any NFA concerns? No, at 16 inches this barrel meets the federal rifle minimum, so no NFA paperwork applies to the barrel length.

What handguard does it use? RRA’s 13-inch extended, lightweight, free-float M-LOK rail.

Buy the Rock River Arms 350 Legend Complete Upper

Order this upper from our Rock River Arms lineup, browsable in our full rifle parts selection, with fast, insured shipping from our Lubbock, Texas gun shop.