Smith & Wesson M&P 300 Whisper 16 inch Threaded Upper Receiver

Description

Product Overview

The Smith & Wesson M&P 300 Whisper 16 inch threaded upper receiver is built on the M&P15 modern sporting rifle platform and is chambered for the .300 Whisper cartridge family, with safe use of .300 AAC Blackout ammunition. It features a 16 inch 4140 steel barrel with 5/8-24 threading and is tuned for reliable cycling with factory sub-sonic and super-sonic loads, suppressed or unsuppressed—making it well-suited for short-range hunting and practical target use.

Key Features

• Designed for reliable operation across sub-sonic and super-sonic ammunition, suppressed or unsuppressed
• 1 in 7.5 twist rate supports a wide range of bullet weights from 110 to 220+ grains
• 16 inch 4140 steel barrel for dependable performance
• AR-pattern M&P15 platform compatibility for straightforward integration
• 5/8-24 barrel threading for common suppressor and muzzle device setups

Add this threaded M&P 300 Whisper upper to your build for a compact .300 Whisper / .300 AAC Blackout setup designed for low recoil and efficient short-range use.