Chiappa Firearms M4-22 Gen II Pro Upper, .22 LR, 16" Barrel, Matte Black, Quad Picatinny Rail, 2x 28rd Mags

The Chiappa Firearms M4-22 Gen II Pro Upper is a .22 LR conversion upper receiver built for shooters who want to run economical, low-recoil practice and plinking sessions on an AR-15 platform. This semi-automatic upper accepts standard AR lower receivers, letting you transform a centerfire rifle into a dedicated rimfire trainer without buying a whole new gun. The 16-inch barrel and matte black finish deliver the AR ergonomics and modularity you're used to, while the included quad Picatinny rail system gives you room to mount optics, lights, or other accessories exactly where you want them.

At 5.95 pounds, the M4-22 Gen II Pro Upper handles like a proper rifle—not a toy. The polymer construction keeps weight down without sacrificing durability, and the steel barrel ensures consistent accuracy through thousands of .22 rounds. Two 28-round magazines come in the box, giving you plenty of ammunition capacity for extended range sessions or competition shooting. Whether you're zeroing a new scope, training a new shooter, or just burning through inexpensive ammo at the range, this upper delivers AR-familiar controls and reliability in a caliber that won't punish your shoulder or your wallet.

Compatible with any standard AR-15 lower receiver, the M4-22 Gen II Pro Upper is straightforward to install and field-strip for cleaning. It's the practical choice for shooters who already have an AR platform and want to maximize trigger time without the cost of centerfire ammunition and the noise that comes with it.

Key Features

• Semi-automatic .22 LR conversion upper receiver for AR-15 platforms
• 16-inch barrel with matte black finish
• Quad Picatinny rail system for accessory mounting flexibility
• Includes two 28-round magazines
• Lightweight polymer construction with steel barrel
• Easy installation and field-stripping on standard AR lowers

Specifications

Frequently Asked Questions

What AR-15 lowers does this upper work with?

The M4-22 Gen II Pro Upper is designed to work with standard AR-15 lower receivers. As long as your lower is a conventional AR-15 platform, this upper will function properly.

Can I use this for training and practice?

Yes. This upper is ideal for shooters who want to practice with AR-15 ergonomics and controls while shooting economical .22 LR ammunition. It's commonly used for training, plinking, and low-recoil practice sessions.

What's included in the box?

The M4-22 Gen II Pro Upper comes with two 28-round magazines. You will need to pair it with an AR-15 lower receiver to have a complete, functional rifle.

Can I mount an optic on the quad rail?

The quad Picatinny rail system allows you to mount optics, lights, lasers, and other standard Picatinny-compatible accessories to customize your setup.