Brownells BRN-180S Gen 2 14.5" Upper Receiver

Description

Product Overview

The Brownells BRN-180S Gen 2 14.5" complete upper receiver is an AR-15 compatible gas piston platform built to deliver reliable operation with a shorter barrel configuration. It features an adjustable gas block with a simple S / U lever for suppressed and unsuppressed use, plus a low-mounted full-length Picatinny rail atop a slim M-LOK handguard for optics and accessories. A Primary Weapon Systems FRC Rearden flash hider is permanently pinned and welded to meet the NFA 16 in minimum barrel length requirement, while still supporting Rearden, Atlas, and Plan B quick-attach suppressor mounting interfaces.

Key Features

• Gas piston AR-15 upper design for dependable cycling
• Two-position adjustable gas block: S for suppressor use, U for unsuppressed fire
• Permanently pinned and welded Primary Weapon Systems FRC Rearden flash hider to meet the NFA 16 in minimum barrel length requirement
• Flash hider supports quick-attach suppressor interfaces compatible with Rearden, Atlas, and Plan B systems
• Self-contained recoil system mounts to a standard mil-spec AR-15 lower without a buffer tube for flexible stock compatibility
• Slim, free-floating M-LOK handguard with a low-profile full-length Picatinny top rail

Build on the BRN-180S Gen 2 for a compact, suppressor-ready piston upper with simplified NFA compliance and everyday handling improvements.