E3 ARMS Upgraded Upper with 13″ Tactical Quad Rail

Product Description

E3 Firearms COMPLETE 5.56 UPPER (Mil-Spec) 7075 Forged Aluminum A-3 Flat Top with T-Marks FULL AUTO Bolt Carrier Group 8620 steel Bolt is 158 Carpenter Steel Bolt is HPT, MPI Front Rail Gas Block Barrel: H-bar Barrel Melonite Finish 1:7 Twist 5.56 Chamber (also accepts .223 Mil Spec M4 Feed Ramp HPT & MPI Carbine Length Gas, direct impingement system Gas port drilled and tuned for optical cycling Our 16″ H-bar Barrels which are more rigid will eliminate any vibration and improve accuracy while at the same time offer lighter weight of that approaching an M4 as opposed to the heavier bull barrels. Our barrels have been professionally developed for accuracy and competition shooting. With a Melonite finish applied to the steel through salt bath ferritic nitrocurizing our barrels not only add to the life of the barrel by over twice of that of a chrome lined barrel but also improves the accuracy, decreases the friction & heat increasing velocity. This upgraded upper includes our Nickel-Boron Bolt Carrier Group with Titanium Firing Pin and the E3 Arms 13″ Quad rail. All of our uppers are available with the standard M4 Melonite barrel, the Stainless Steel barrel or our Pencil Barrel. We try to keep all varieties in stock. If the one of the barrel choices is not in stock we will build your upper receiver with one of the barrels in stock and notify you. If you require a specific barrel, there may be a delay in building your upper receiver.

13.5 inch Parallax Rail
M4 barrel 1-9 twist STAINLESS STEEL
7075 Upper receiver M4 feed ramps
Nickel Boron Full Auto carrier 8620 steel
Bolt is Carpenter 158
Ejector is melonited
Extractor is melonited
Heat treated and shop peen
Gas key is machined
Comes with titanium firing pin
Micro gas block with SS tube

E3 13″ FFSSR Rail Handguard for AR Rifles. The E3 FFSSR single-piece aluminum foregrip delivers one of the slimmest profiles in the industry. The middle cutout area is designed to be compatible with all MagPul accessories, including rail sections. Rails where you need them—not in your way.


  • 6061-T6 Aluminum Extrusion
  • Four limited rotation QD Mounts front and rear. (2) Rear single picatinny rail mounts for sling hook type mounts (MagPul RSA)
  • Sleeve-style barrel nut with 1-1/8″ flats
  • Mounts using 4 standard, 2 low-head hex screws Mounting holes every 22.5°
  • Includes shims for proper alignment
  • Cutout sections compatible with all MagPul accessories, including rail sections
  • Patent Pending