Ati Mil Sport Complete Ar-15 - Upper 5.56 7.5" Black

The ATI Mil Sport Complete AR-15 upper in 5.56 NATO with a 7.5" barrel is a ready-to-run solution for builders who want a compact, complete upper that handles shooting duty right out of the box. Built on the proven AR platform, this short-barrel upper delivers the versatility you need for close-quarters work, home defense, or a nimble truck gun—without the paperwork headaches of a registered SBR if you pair it with a pistol lower. The 1:8 twist rate stabilizes a full range of 5.56 ammunition, from lightweight varmint loads to heavier tactical rounds.

What makes this upper genuinely useful is that it comes complete: bolt carrier group and charging handle are already installed, so you're not hunting for parts or sorting through compatibility charts. The 7" M-LOK rail gives you solid real estate for lights, optics, and accessories while keeping the overall package compact and quick-handling. Everything is finished in black and ready to mount to your lower receiver.

Whether you're building a pistol, SBR, or short-range competition gun, this ATI upper takes the guesswork out of sourcing a short-barrel complete assembly. It's a no-nonsense, affordable way to get a functional 5.56 upper that actually shows up ready to work.

Key Features

• Complete upper assembly—bolt carrier group and charging handle included
• 5.56 NATO caliber with 1:8 twist barrel for reliable performance across ammunition types
• 7.5" barrel optimized for compact, maneuverable handling
• 7" M-LOK handguard for accessory mounting
• Black anodized finish

Specifications

Frequently Asked Questions

Is this upper complete, or do I need to add a bolt carrier group and charging handle?

This is a complete upper assembly. The bolt carrier group and charging handle come installed and ready to function—you just mount it to your lower receiver.

What lower receiver does this fit?

This upper is designed for standard AR-15 lower receivers. Verify that your lower is compatible with 5.56 NATO and a direct-impingement system.

Is this upper legal as-is, or do I need to register it as an SBR?

That depends on your lower receiver. If you pair this upper with a rifle-length lower (16" or longer overall), you have a legal rifle. If you use a pistol lower, the short barrel means SBR registration may be required—check your state and federal laws.

Can the handguard accept standard AR accessories?

Yes. The 7" M-LOK rail accepts M-LOK-compatible accessories for mounting optics, lights, slings, and other gear.