The Midwest Industries AR-15 Upper Receiver (brand part number MI-556CRM9-U) pairs a 10.5-inch carbine-length barrel chambered in .223 Remington/5.56 NATO with the company’s MI-CRM9.5 M-LOK handguard. Built by Midwest Industries, the steel barrel wears a durable Melonite finish and a 1:7 twist rate, and it is threaded 1/2×28 to accept standard muzzle devices. This upper ships complete and assembled but without a bolt carrier group or charging handle, so builders can supply their own or select a matching set separately.

Key Specifications

• Barrel length is 10.5 inches, chambered in .223 Remington/5.56 NATO.
• Twist rate is 1:7, suited to heavier 5.56 bullet weights.
• Barrel material is steel with a Melonite finish.
• Threaded 1/2×28 to accept standard muzzle devices.
• Runs a carbine-length gas system matched to the short barrel.
• Handguard is the MI-CRM9.5 M-LOK free-float design.
• Overall assembled length is approximately 27.1 inches.
• Ships without a bolt carrier group or charging handle.
• Receiver includes M4 feed ramps machined in for reliable cartridge feeding.

Frequently Asked Questions

Does this include a BCG or charging handle? No, Midwest Industries ships this upper without either; both are sold separately.

Is this itself a Short-Barreled Rifle? No. As a bare upper with no lower receiver, it is not a complete firearm; pairing a sub-16-inch barrel with a shouldered rifle-configured lower without an approved NFA registration would create an SBR, but building it as an AR pistol on an unregistered lower is legal.

Buy the Midwest Industries 10.5-inch AR-15 Upper

Build a compact, M-LOK-equipped AR-15 upper around a durable Melonite-finished barrel. Order this AR-15 upper from our Lubbock, Texas gun shop for fast, insured shipping to your door.