M4E1 Complete Upper, 7.3″ 5.56 Barrel, EM-7 Gen 2 Handguard

M4E1 Complete Upper, 7.3″ 5.56 Barrel, EM-7 Gen 2 Handguard – Anodized Black

Product Overview

Build a compact, maneuverable AR-15 with the M4E1 Complete Upper, 7.3″ 5.56 Barrel, EM-7 Gen 2 Handguard – Anodized Black. This short-barreled upper suits pistol builds, SBRs, and shooters who want a lightweight, fast-handling setup. It pairs a 7.3″ 5.56 NATO barrel with the EM-7 Gen 2 handguard for a sleek, modern profile finished in durable anodized black.

We machine every M4E1 Complete Upper, 7.3″ 5.56 Barrel, EM-7 Gen 2 Handguard – Anodized Black to mil-spec tolerances. It drops onto any mil-spec AR-15 lower for a tight, reliable fit.

Includes:

• M4E1 Enhanced Assembled Upper Receiver
• 7″ Enhanced M-LOK Handguard
• 7.3″ 5.56 Pistol Length CMV Barrel
• Low Profile Gas Block and Pistol Length Gas Tube
• Product comes assembled
• This complete upper does not include BCG or Charging Handle. These products may be selected as add-ons under the Finish Your Build tab
• The muzzle brake that comes with this complete upper receiver is NOT pinned nor welded to this barrel.

M4E1 Upper Features:

• Forged from 7075 T6 aluminum
• Precision machined to M4E1 specs
• M4 feedramps
• Matte black hard coat anodized Mil 8625 Type 3 Class 2
• Laser engraved T-marks (Anodized only)
• Comes assembled, with port door and forward assist installed
• Accepts standard AR15/M16 components
• Handguard mounting platform is forged into the receiver
• Works with Aero Precision handguards but also fits most BAR-system handguards
• Barrel nut and wrench are included

Gen 2 Enhanced Handguard Features:

• 1pc free float design
• Built in anti-rotation tabs
• Scalloped rails
• Continuous top rail
• 1.78″ inside diameter fits most muzzle devices and 1.5″ suppressors
• Compatible with low profile gas blocks
• Gen 2 Feature – Quick disconnect sling socket at the 3, 6 and 9 o’clock positions
• Gen 2 Feature – Additional milling along flats to aid with gripping and add visual appeal
• Gen 2 Feature – New profile for the continuous picatinny top rail

7.3″ 5.56 Pistol Length Barrel Features:

• Chamber: 5.56
• Length: 7.3″
• Twist: 1 in 7
• Threading: 1/2″x28
• Material: Chrome Moly Vanadium
• Finish: QPQ corrosion resistant finish both inside and out
• Gas Block: .750
• Gas System Length: Pistol
• Weight: 17.25oz
• M4 Barrel Extension
• HP and MPI Tested

What Is the Upper Made Of?

Here’s what goes into this build:

• Receiver — We machine it from 7075-T6 aluminum for a strong, lightweight, fatigue-resistant build.
• Barrel — We build the 7.3″ barrel from chrome-moly vanadium steel. It handles heat well and holds up under sustained use, even in a short-barrel configuration.
• Finish — A hard-coat anodized black finish protects the receiver and barrel from corrosion and wear while giving the upper a clean, tactical look.
• EM-7 Gen 2 Handguard — We build this handguard from aluminum in a free-float design. It keeps the barrel free of contact points, improves accuracy, and offers full M-LOK compatibility for accessories.
• Gas System — A pistol-length gas system matches the short 7.3″ barrel, cycling the action reliably in a compact footprint.

This combination keeps your M4E1 Complete Upper, 7.3″ 5.56 Barrel, EM-7 Gen 2 Handguard – Anodized Black light, durable, and ready for close-quarters or PDW-style builds.

How to Install This Upper

Follow these steps to mount your new upper:

1. Check compatibility. Confirm your lower receiver is mil-spec and matches standard AR-15 uppers.
2. Remove the takedown and pivot pins on your lower receiver if needed.
3. Align the upper and lower. Line up the pivot pin lug on your lower with the matching hole on the upper.
4. Insert the pivot pin. Push it through to join the front of the upper and lower. The upper now pivots like a hinge.
5. Close the upper onto the lower until the two sit flush.
6. Insert the takedown pin through the rear of the receivers to lock them together.
7. Install the charging handle and bolt carrier group if they aren’t already in place.
8. Run a function check. With the rifle unloaded, cycle the charging handle and test the trigger before you head to the range.

Always confirm your firearm is unloaded before you start. Ask a qualified gunsmith for help if you’re new to firearm assembly.

How to Disassemble the Upper Receiver

Reverse the installation steps for cleaning or maintenance:

1. Clear the firearm. Confirm it’s unloaded and remove the magazine.
2. Remove the charging handle and bolt carrier group. Pull the charging handle back slightly, take out the bolt carrier group, then remove the charging handle fully.
3. Push out the takedown pin to separate the rear of the upper and lower.
4. Pivot the upper open on the front pivot pin.
5. Remove the pivot pin to fully separate the upper from the lower.
6. Remove the EM-7 Gen 2 handguard if needed. Loosen the barrel nut or release the attachment system for deeper cleaning around the barrel and gas system.

Clean the bolt carrier group, chamber, and barrel after each use. Short-barreled builds run hotter and cycle faster, so regular cleaning keeps this upper running reliably.

How to Buy This Upper

Follow these steps to order:

1. Check your state and local laws. Short-barrel configurations (especially SBR builds) carry specific federal and state regulations. Confirm your local rules and any required paperwork (such as an ATF Form 1) before you build.
2. Choose your configuration. Confirm this 7.3″ barrel and EM-7 Gen 2 handguard match your build goals.
3. Add to cart and checkout through our secure process.
4. Wait for shipping. Most complete uppers ship fast since they don’t require an FFL transfer in most areas (check your local laws to confirm).
5. Install your upper using the steps above once it arrives.

Have questions about compatibility, SBR regulations, or shipping restrictions in your state? Contact our support team before you buy.