Angstadt Arms Stripped Pistol Caliber Upper Receiver (0940/1045)

The Angstadt Arms Stripped Pistol Caliber Upper Receiver (0940/1045) is a dedicated AR-15 upper designed from the ground up for shooters who want to build or convert a rifle into a reliable pistol caliber platform. Unlike universal uppers that compromise on design, this upper is engineered specifically for pistol rounds, giving you a purpose-built option for 9mm, .40 S&W, .357 SIG, .45 ACP, and 10mm builds. Whether you're assembling a home-defense rifle, a range gun, or a compact platform optimized for pistol ammunition, this stripped upper gives you the core component you need—and the flexibility to complete it with your choice of barrel, bolt, and furniture.

Stripped uppers appeal to builders and AR enthusiasts who want control over their finished rifle. You get the precision-machined upper receiver—the regulated part—without the barrel, bolt carrier, or charging handle, so you can specify exactly the components that match your caliber choice and shooting goals. This is a no-frills, no-compromise foundation: quality American manufacturing in a straightforward package.

The multi-caliber compatibility across the 9mm through 10mm range makes this upper a smart choice if you're thinking about expanding your pistol caliber AR stable or want the option to swap barrels and bolts down the road. Just remember that each caliber requires its own appropriately-sized barrel and bolt combination—this upper is the receiver only. If you're new to upper receiver builds, have a gunsmith or experienced friend verify your final assembly before firing.

Key Features

• Dedicated pistol caliber design—not a universal compromise
• Compatible with 9mm, .40 S&W, .357 SIG, .45 ACP, and 10mm
• Stripped receiver only—you select barrel, bolt, and charging handle
• AR-15 platform compatible

Specifications

Frequently Asked Questions

Is this upper receiver compatible with standard AR-15 parts?

This is an AR-15 stripped upper receiver, meaning it will accept AR-15 compatible barrels, bolt carriers, and charging handles. However, you must use pistol-caliber-specific barrels and bolts matched to your chosen caliber (9mm, .40 S&W, .357 SIG, .45 ACP, or 10mm). Do not attempt to use rifle-caliber components.

What do I need to finish this stripped upper?

A stripped upper receiver is the foundation only. You'll need to source and install a barrel, bolt carrier group, charging handle, and gas tube appropriate for your selected pistol caliber. Some builders also add a forward assist and dust cover. Work with a qualified gunsmith if you're unfamiliar with upper assembly.

Can I use different calibers by just swapping barrels?

Yes—the upper receiver itself is caliber-agnostic across the supported range (9mm through 10mm). To switch calibers, you'll need to swap the barrel and bolt carrier group to match the new round. The upper receiver stays the same.

Is this a complete upper or just the receiver?

This is a stripped upper receiver only. It does not include a barrel, bolt carrier group, charging handle, forward assist, or dust cover. You assemble those components yourself or have a gunsmith do it.