M4E1 Threaded Complete Upper, 13.9" 5.56 Mid-Length Gov Profile w/ 12.7" MOD 4 Handguard

This complete upper includes our Minimal Optical Deflection (MOD) 4 Handguard. The MOD 4 handguard seamlessly blends robust construction with an ergonomic form factor, ensuring no compromises between the two. Machined from 6061-T6 aluminum, the handguard is engineered with a focus on stiffness to drastically reduce deflection under load. It attaches to the upper receiver via a steel barrel nut, which also serves to significantly reduce point-of-impact shift when using an infrared laser aiming device under load.

A 7 sided M-LOK® interface allows the user to customize their handguard to their exact specifications and needs. Lastly, each of the 4 QD sockets on the MOD 4 utilize a steel liner to ensure a higher shear load and longer service life with the continued use of QD swivels.

INCLUDES:

M4E1 Threaded Assembled Upper Receiver

• MOD 4 12.7" Handguard
• 13.9" 5.56 Mid-Length Barrel
• Low Profile Gas Block and Gas Tube
• Product comes assembled
• The muzzle brake that comes with this complete upper receiver is NOT pinned nor welded to this barrel. Per the National Firearms Act, the muzzle brake MUST be pinned and welded to achieve the necessary 16" as defined by the ATF for a rifle build.

Optional:

• Need a BCG and Charging handle® Use the dropdown to purchase this upper receiver with a mil spec chrome phosphate BCG and BREACH ambidextrous charging handle!

• NOTE: Complete Upper Receiver Groups ship with a compatible BCG and Charging Handle. Complete Uppers do not ship with a BCG or Charging Handle.

Breach Charging Handle Features (Optional) :

• Ambidextrous Controls: Ergonomically designed 7075 Aluminum levers allow the user to easily charge their firearm with either hand, while remaining low profile and comfortable when slung.
• Robust Construction: Reduced chamfer angles on the 7075 Aluminum reinforced bar design provide a strong foundation for the BREACH® that is resistant to rotational flex or breakage.
• Patent-pending Lever Mechanism: Transfers force-of-use away from the roll pins and into the top/head portion of the reinforced bar protecting the charging handle in the most demanding circumstances.
• Gas Deflection Shelf: Aligns with the upper receiver to redirect gas flow away from the users face when shooting suppressed.
• Functional Design: It is not all just good looks. Stylistic cuts on the charging handle also help to clear stuck on carbon and debris from the upper receiver, while the spacer design seals and protects the lever mechanism from debris.

Phosphate 5.56 BCG Features (Optional) :

• M16-cut carrier
• Machined from 8620 steel
• Carrier has forward assist serrations
• Mil-Spec phosphate coating
• Properly staked gas key
• Chrome lined gas key and bolt channel
• 5.56 Bolt is machined from Carpenter 158 tool steel
• Shot peened
• HPT tested/MPI marked
• Black o-ring insert on extractor

M4E1 THREADED UPPER RECEIVER FEATURES:

• New enhanced forging that gives the upper receiver a "billet look"
• New picatinny profile that blends seamlessly with our Enhanced Series Handguards
• M4 Feedramps
• .250 takedown pin holes
• Laser engraved T-marks
• Includes port door and forward assist installed

MOD 4 HANDGUARD FEATURES:

• Full top picatinny rail for optional attachments
• Quick disconnect sling socket at the 3, 6 and 9 o'clock positions
• Compatible with low profile gas blocks
• 1.2" Inside diameter
• 1.5" Outside diameter
• Compatible with mil-spec AR15 upper receivers and barrels

13.9" 5.56 MID-LENGTH BARREL FEATURES:

• 5.56x45mm NATO
• QPQ Finish
• Gov Profile
• .750" gas block journal
• Mid-Length Gas System
• 1/7 Twist Rate
• M4 Feed Ramp Extension
• HP and MPI Tested
• Standard A2 Flash Hider