Spike’s Tactical 6-Position Mil-Spec Buffer Tube – Black Hardcoat Anodized Aluminum – SLA500R, UPC 855319005204
Finish your AR-15 build the right way with the Spike’s Tactical Buffer Tube 6 Position Mil-Spec – SLA500R. This AR-15 carbine receiver extension is precision-machined from 7075-T6 aluminum, finished in black Type III hardcoat anodizing, and features six adjustable positions with laser-engraved position markers. It’s a durable, Mil-Spec–dimensioned buffer tube designed for serious AR builders who care about reliability and fit. Primary Arms+2GrabAGun+2
Whether you’re upgrading from a commercial-spec tube or starting a premium build from scratch, this Spike’s Tactical SLA500R buffer tube delivers strength, consistency, and smooth performance in a clean, no-nonsense package.
Mil-Spec 7075-T6 Aluminum – Stronger Than 6061
At the heart of the SLA500R is its 7075-T6 aluminum construction—significantly stronger and more durable than common 6061 tubes. GrabAGun+2Classic Firearms+2
Key construction advantages:
7075-T6 aluminum for superior tensile strength and impact resistance
Precision-machined from a single piece for maximum rigidity and consistency OpticsPlanet+1
Built to true Mil-Spec diameter (approx. 1.148" OD) for proper fit with Mil-Spec carbine stocks Hinterland Outfitters+1
If you’re running a duty rifle, defensive carbine, or high-round-count training gun, a 7075-T6 Mil-Spec buffer tube is one of the smartest reliability upgrades you can make.
Type III Black Hardcoat Anodized with Dry Film Lube
Spike’s Tactical finishes the SLA500R with a Type III black hardcoat anodized surface and a dry film lubricant on the interior. Primary Arms+2GrabAGun+2
Why that matters:
Hardcoat anodizing improves wear resistance and corrosion protection over standard anodizing
Matte black finish matches most AR receivers and gives a low-glare, professional look
Dry film lube inside the tube reduces friction between the buffer and receiver extension, promoting smoother cycling and less wear than bare aluminum Primary Arms+2OpticsPlanet+2
You’ll notice the difference when you run the action—buffer movement feels slick and consistent, even on new builds.
6-Position Carbine Receiver Extension – Adjustable & Compatible
This Spike’s Tactical buffer tube is a 6-position carbine receiver extension, giving you a wide range of length-of-pull adjustments to fit different shooters, gear, and shooting positions. Primary Arms+2GrabAGun+2
Highlights:
Six adjustment positions for dialing in the perfect stock length
Laser-engraved position markers on the top of the tube for quick, repeatable stock settings Palmetto State Armory+2GrabAGun+2
Mil-Spec diameter – compatible with Mil-Spec carbine stocks and standard AR-15 end plates and castle nuts (not included) GrabAGun+2Cheaper Than Dirt+2
If you’re moving from a commercial-spec tube, this upgrade opens the door to a wider range of Mil-Spec carbine stocks and ensures a tight, wobble-free fit.
Optimized Dimensions & Lightweight Design
The SLA500R buffer tube is built to carbine-length specs:
That keeps your AR-15 carbine or AR-pattern rifle lightweight and well-balanced, while still giving you full adjustability and durability for hard use.
Ideal for AR-15 Builders, Upgrades, and Duty Carbines
The Spike’s Tactical 6-Position Mil-Spec Buffer Tube SLA500R is a great choice for:
New AR-15 carbine builds using Mil-Spec components
Upgrading from commercial-spec or cheap OEM tubes
Duty and patrol rifles where reliability and Mil-Spec dimensions matter
Competition carbines and defensive rifles that demand consistent cycling and stock fit OpticsPlanet+2Cheaper Than Dirt+2
Pair it with your preferred carbine buffer, recoil spring, castle nut, and end plate (sold separately or in kits) and you’ve got a solid foundation for any serious AR build.
Made in the USA & Backed by Spike’s Tactical Reputation
Spike’s Tactical is known for American-made, Mil-Spec AR components, and this buffer tube is no exception. Multiple retailers and Spike’s itself list the SLA500R as USA-made and engineered to meet or exceed Mil-Spec receiver extension standards. spikestactical.com+2OpticsPlanet+2
That means:
Consistent quality and tolerances
A component trusted by builders, armorers, and enthusiasts
Excellent long-term durability in real-world use
Key Features & Specifications – Spike’s Buffer Tube 6 Position Mil-Spec SLA500R
If you want a true Mil-Spec 6-position buffer tube that combines 7075-T6 strength, hardcoat anodizing, dry film lube, and laser-engraved position markers, the Spike’s Buffer Tube 6 Position Mil-Spec SLA500R (UPC 855319005204) is a rock-solid choice for any serious AR-15 build or upgrade.
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