M4 Complete Upper

Your Price: $690.00
In Stock
Part Number:M4-COMP-UP

Choose Options

10.5" Barrel
11.5" Barrel
13.7" Barrel
14.5" Barrel
16" Barrel

M4 Complete Upper, does not include a BCG or a Charging Handle


  • MA Assembled Upper Receiver
  • 5.56x45 NATO
  • 10.5", 13.7", 145" or 16" Government Profile Barrel
  • 4150 chrome moly vanadium steel
  • HPT & MPI
  • 1-7 Twist
  • QPQ Nitride finish
  • URS (Utility Rail System) MLOK Handguard (9.8", 13" or 15")
  • Nitride 4150 LP Gas Block and Gas Tube
  • A2 Birdcage Flash Hider
  • Product comes assembled

*Lifetime Guarantee covers manufacturing defects in materials and workmanship, regardless of the age of the product, but it does not cover normal wear and tear. Wear and tear is damage that naturally and inevitably occurs as a result of normal use.

The use of reloaded or remanufactured ammunition will void the warranty, due to the unpredictability of the standards (SAMMI/NATO) adhered to, since reloads of poor quality ammunition may not meet (SAMMI/NATO) specifications, may exceed limits, and therefore may be unsafe.

ITAR: International Traffic in Arms Regulations Controlled
5 Stars
13.9 Build
I love this upper and the quality of it is amazing. I’ve fired 600 rounds through it with no issues and it was extremely accurate. Would definitely buy another upper for another 13.9 build.
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Reviewed by:  from Arizona . on 2/19/2023

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