https://midstatefirearms.com/product/msf-12-5-carbine-length-5-56-nato-upper-receiver-group/

shipping available

Start your 12.5″ Ar15 Pistol build with this properly assembled Ar-15 5.56 upper receiver. Features:

• 12.5″ 4150 CMV Nitride Ar15 barrel.
• 1/2-28 threads.
• Carbine gas system.
• .750 Steel low profile gas block.
• Free Float M-LOK Handguard.
• 7075-t6 Mil Spec Aluminum Upper Receiver, Anodized black.
• Dust cover and forward assist installed.

Uppers are custom built to order, professionally assembled and quality checked. Make it a complete upper ready to pin to your AR lower by adding BCG and charging handle. If you order an optional bolt carrier group and charging handle with it, we will check headspace and test fire with them as well.

Assembled, Test-Fired, and QC’d In-House

We assemble everything in-house, completely customized to your order. Our engineers have many years of experience in the industry, making sure that everything that goes out the door is built to the highest standard possible.

Prior to shipping, we test fire and follow a strict quality control protocol, paying extra attention to the gas system and headspace, ensuring that your AR-15 will function properly and will reliably fire in all cases. 

High-Quality Components

Over the past 10 years, we have carefully refined the parts we use for our AR-15 uppers. We only use high-quality components in our builds that have been sourced from proven manufacturers and OEMs.

We have built tens of thousands of AR-15s and ensure reliability, durability, and accuracy in all of our products.

Limited Lifetime Warranty

We stand behind our products and have a limited lifetime warranty on the uppers that we sell.  Our warranty protects against defects in product, material, or workmanship.

If there is an issue, simply contact us, and we will handle it. We will repair/replace items if necessary.