The M5 .308 Assembled Upper Receiver comes with both the port door and forward assist hardware pre-installed. Forged from 7075-T6 aluminum, this assembled upper is precision machined to accept standard .308 components and is the perfect upper for your big bore build. Match this with our M5 .308 lower receiver for a solid and dependable fit.
.2795 takedown pin holes (DPMS size)
Laser engraved T-marks
DPMS High Profile (.210) Tang)
Includes port door and forward assist
M5 .308 Assembled Upper Receiver in Anodized Black
Manufacturer Part Number: Black: APAR308503A, FDE: APAR308505A
Built to the correct Mil-Specs
(Inside Diameter for barrel extension slightly undersized for a tighter fit to the barrel and a more accurate rifle. Please use a heat gun or hair dryer to warm up threaded bore of receiver if barrel extension is too tight.)
•Precision machined to correct Mil-Specs from 7075 T6 Forgings extension, providing the user with superior strength when dropped or when mortaring malfunction clearance drills.
•Fully Assembled with forward assist, and ejection port cover
•Mil-Std 1913 Rail for mounting optics and accessories
•Machined for use with barrels that use an M4 barrel extension
•Laser etched T-markings for addressing the remounting of optics
•Includes Mil-Spec Forward Assist with heat treated tool steel pawl, with press fit and pinned cap
•Hard Coat Anodized per Mil-A-8625F, Type III, Class2
•Dry Film Lube on interior bore per Mil-Specs
•As with all BCM® products, Made in the U.S.A.View full product details
This AR-15 carbine kit includes everything you need to add to a stripped or 80% lower receiver to complete your build.
View full product details
- Slick-side upper receiver eliminates dust cover and forward assist for reduced weight and cleaner lines
- Compatible with mil-spec bolt carrier groups, charging handles, and handguards
- Flat-top Picatinny rail accommodates mounting optics or other accessories
- 7029-T6 aluminum
- 10 oz. weight
Seekins Precision’s Integrated Rail Mounting technology (iRMT) uppers integrate the rail mounting points into the upper retaining the stiffness of a true monolithic upper while allowing the rails to be completely modular. This new upper design is considerably thicker in the most critical area and will aid in squeezing all of the potential accuracy out of your AR15 rifle. Instead of a standard barrel nut our iRMT system uses an externally threaded, Steel barrel nut with 1-1/8” wrench flats on it for simple installation. No special proprietary wrenches needed.
SP iRMT-R upper is compatible with Seekins Precision’s BAR rail and MCSR railsView full product details
Seekins Precision’s Integrated Rail Mounting technology (IRMT) uppers integrate the rail mounting points into the upper retaining the stiffness of a true monolithic upper while allowing the rails to be completely modular. This new upper design is considerably thicker in the most critical area and will aid in squeezing all of the potential accuracy out of your AR15 rifle. Instead of a standard barrel nut our IRMT system uses an externally threaded, Steel barrel nut with 1-1/8” wrench flats on it for simple installation. No special proprietary wrenches needed.
The IRMT-3 V3 Upper is only compatible with the Seekins Precision SP3R V3 rail system.
Ships with a forward assist & dust door already installed.
The Spike’s Tactical billet upper-Gen II receiver is not just another different cosmetic alternative to forged upper receivers but it’s actually designed with functional upgrades that aren’t available on other billet upper receivers!
We machine this bad boy out of 7075 billet Aluminum and finish it in a durable Type III Hardcoat Anodized finish. Of course, we cut the M4 feed ramps before the Anodizing process to avoid reliability issues down the road. We also flared the side walls of the receiver to eliminate accidental bolt release problems and we also machined the upper receiver in a way that lets you use the popular Magpul BAD lever or other aftermarket bolt catch levers which most other billet upper receivers don’t let you do. Because of our beefier design, it allows for less flex than forged upper receivers.
We also play nice here at Spike’s Tactical and because of that, we machined our billet upper receiver to accept most aftermarket rail systems as well as pre-install the forward assist and the ejection port door. Just like how our billet lower receiver utilizes set screws to retain everything in place, the forward assist is held in place with a set screw for easy disassembly if you ever need to in the life of this upper receiver.
Our billet upper receiver matches our billet lower perfectly, but it also works great with standard forged lowers so it’s fully up to you on which receiver you want to use.
Get one today and make your next build the envy of everyone at the range!
The Spike’s Tactical M4 flat top upper receiver is machined from a Mil-Spec 7075 T6 forging with a durable Type III Hardcoat Anodized finish that also features laser engraved T-Markings, M4 feed ramps cut into the receiver before Anodizing to avoid future reliability issues, and finished with our spider logo. We’ve also included a forward assist and ejection port door cover already installed in the upper for you!