Colt M4 Le6945 Upper Group 10.3In W/ Bcg And Sights

The Colt M4 LE6945 upper receiver group is a complete short-barrel upper built for shooters who need a compact, combat-ready AR platform. This 10.3-inch upper comes fully assembled with bolt carrier group and front and rear flip-up sights, so you can mount it to a compatible lower receiver and get on target without additional parts hunting. The monolithic upper receiver design gives you a rigid, one-piece Picatinny top rail and solid mounting surfaces throughout—a significant step up from traditional M4 uppers if accuracy and repeatability matter to you.

The barrel is chrome-lined with a 1-7 twist rate and button-rifled for consistency. The free-floated barrel design reduces contact between the barrel and upper, helping you wring better accuracy out of a short-barrel package. Built-in flip-up front sight integrates with standard-height rear sights, keeping your profile compact while maintaining irons backup if your optic fails. This is the kind of upper that works equally well for home defense, short-range tactical training, or a truck gun setup where space is at a premium.

Since this is a complete upper group, installation is straightforward: slide it onto a compatible lower receiver, secure it, and you're ready to function-check. The included sights are a practical touch that lets you start shooting immediately. This upper respects all federal NFA regulations and restrictions—confirm your local and state laws before purchase, especially if you're considering any Form 1 or Form 4 tax stamp applications.

Key Features

• Monolithic upper receiver with one-piece Picatinny rail for co-witness mounting
• 10.3-inch chrome-lined barrel, 1-7 twist, button-rifled for accuracy
• Free-floated barrel design reduces harmonics and improves precision
• Includes bolt carrier group—no need to buy separately
• Built-in flip-up front sight with included rear sight
• Compact form factor ideal for CQB, home defense, and vehicle platforms

Specifications

Frequently Asked Questions

What lower receiver does this upper fit?

This upper receiver group is compatible with standard AR-15 lower receivers. Verify your lower is spec-compliant before assembly.

Is the bolt carrier group included?

Yes, this upper comes with the bolt carrier group installed and ready to function. No additional BCG purchase is necessary.

Are sights included, or do I need to buy them separately?

Sights are included with this upper. You get a built-in front sight and a rear flip-up sight, so you can shoot with irons immediately after assembly to a lower receiver.

Is this a short-barrel rifle, and do I need a tax stamp?

This 10.3-inch upper, when assembled to a lower receiver with a stock, creates a short-barrel rifle (SBR) and is subject to NFA regulations. Consult federal law and your local ATF field office regarding registration and tax stamp requirements before assembly.