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LMT Lewis Machine & Tool 16" Upper Assembly 1:7 5.56 .223
LMT Lewis Machine & Tool 16' Upper Assembly 1:7 5.56 .223

LMT Lewis Machine & Tool 16" Upper Assembly 1:7 5.56 .223

Part Number:L7UB1
Your Price: $579.00
Out of Stock.

Choose Options

Add Milspec Charging Handle [+$14.95]
Add Milspec Polymer Handguard [+$15.95]
Add Magpul MOE Handguard [+$27.95]
Add LMT Tactical Charging Handle [+$69.00]
Add LMT Ambi Tactical Charging Handle [+$99.00]
Add Guntec USA Nitride BCG [+$99.95]
Add WMD M16 Nickel Boron BCG [+$154.95]
Add Milspec LMT Semi AR15 Bolt Carrier Group [+$239.00]
Add Milspec LMT M16 Bolt Carrier Group [+$239.00]

LMT Lewis Machine & Tool 16" Stripped Upper Receiver Assembly 1:7 5.56/.223 with A2 Flash Hider


One of the Most Respected Names in M16 / M4 / AR-15's delivered to your door. NO FFL REQUIRED.


Looking for a high quality & dependable AR15 UPPER to be the foundation of your new build?  The LMT 16" upper is the "Best Bang for the Buck" affordable solution!

The upper is built off of the LMT standard forged A4 receiver with M4 feed ramps.  The barrel is mil-spec machine gun grade chrome-moly vanadium material, M4 profile, light government contour, 5.56mm chamber and bore, 1/7 twist ratio and 1/2x28 threaded barrel and chrome lined for corrosion and wear resistance.  All barrels are magnetic particle tested, Cryogenically treated for enhanced accuracy, easier cleaning and longer life, and put to the test with 50% overload Proof round without incident failure or flaw "because failure is not an option".  Utilizing fully implemented Quality Assurance methods and procedures to ensure the highest quality and reliability of products. LMT is ISO 9001:2000 Certified and MADE IN USA.

LMT Barrel Specifications

    * Mil-spec certified 4150 chrome-moly vanadium steel barrel
    * Cryogenically treated for enhanced accuracy, easier cleaning and longer barrel life
    * Chrome Lined for corrosion resistance
    * M4 feed ramps/Barrel Extension
    * 1/7 twist to stabilize higher bullet weight & 11 degree recessed target crown
    * 1/2x28 Threaded Muzzle
    * Parkerized Barrel, including under the front sight base
    * M4 contour

Each barrel is individually magnetic particle tested. Barrels are engraved MP 5.56 NATO 1/7.



Why choose LMT?

Lewis Machine & Tool Company (LMT) was founded in 1980 to provide the US military, law enforcement and government agencies with high quality weapons and components. Their quality has become recognized domestically and internationally and earned the distinction of being a General Services Administration (GSA) Supplier.  They have been awarded numerous special forces, law enforcement, and military contracts for their rifle's competitive stress test wins and have achieved the highest level of factory quality with ISO 9001:2000 certification.  

What is Magnetic Particle Inspection (MPI) and High Pressure Testing (HPT)?

The barrels are HPT (High Pressure Testing) tested which is a process wherein a proof load rated at 70,000 psi (far exceeding the pressure of a normal round) is fired trough the barrel. The barrel is then tested with a non-destructive process called MPI (Magnetic Particle Inspection).  MPI is a process that utilizes magnetic powder to detect any flaws in the barrel extension and barrel from the proof load.  Many manufacturers only MPI a couple rifles a batch.  EVERY LMT barrel is MP tested and engraved as such.


What is Included?

  1. LMT Barreled and headspaced forged M4 upper
  2. A2 bird cage flash hider
  3. Fixed A2 Front Sight gas block with bayonet lug
  4. Front sight post assembly installed
  5. Front sling swivel installed
NOT INCLUDED: Handguard, Bolt Carrier Group, Rear Sight, Charging Handle

OPTIONAL UPGRADE TO LMT TACTICAL CHARGING HANDLE:LMT's new Tactical Charging handle features our newly designed tactical latch for easier manipulation of the charging handle. Improved ergonomics. ** For use on 5.56 or 6.8 system only ** 

Can you put .223 Remington ammo in a 5.56 upper?

Yes, you can put .223 into a 5.56 chambered upper, but NOT the other way around due to pressure related issues with slight variations in the chamber (5.56 are slightly longer). Do NOT purchase a rifle chambered in .223 if you EVER plan on shooting any military NATO 5.56 ammo, which is the most common, least expensive and most widely used AR15 cartridge available in all the world.  The problem is NATO cartridges have bullets that will become jammed into the rifling of a SAAMI .223 chambering (the throat is too short). This is VERY DANGEROUS, for a lot of reasons.  For best accuracy, 5.56 is recommended but .223 will shoot fine and safely.

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