The Spike Tactical AR-15 M4 Complete Stock Kit with T2 Buffer is a fully assembled, Mil-Spec stock solution that streamlines your build and delivers reliable performance from the ground up. This kit includes everything needed to complete the rear of your lower receiver using high-quality, matched components designed to work together.
This Spike Tactical AR-15 M4 kit takes the guesswork out of finishing a rifle. Every piece is matched, so you get a dependable foundation right out of the box.
What the Spike Tactical AR-15 M4 Stock Kit Is and Who It Is For
This is a complete M4 stock kit from Spike’s Tactical, built for shooters finishing a fresh AR-15 or upgrading an existing rifle. It bundles the stock, buffer tube, buffer spring, castle nut, end plate, and the ST-T2 tungsten buffer.
It fits new builders who want a proven, all-in-one solution and experienced shooters looking to smooth out cycling. Anyone who wants matched components rather than a parts-bin assembly will value this kit.
The ST-T2 tungsten buffer is one of the brand’s most popular upgrades for improving rifle function.
Key Features
The kit is assembled for reliable function and smoother shooting.
- Complete M4 stock kit for the rear of an AR-15 lower
- Includes the ST-T2 tungsten buffer for smoother cycling
- Comes with buffer tube, buffer spring, castle nut, and end plate
- Matched Mil-Spec components built to work together
- Added buffer mass helps reduce felt recoil
- Durable polymer stock for hard-use reliability
Specifications and Build
At the heart of the Spike Tactical AR-15 M4 kit is the ST-T2 tungsten buffer, whose added mass slows the bolt carrier group for a smoother cycle. That reduction in speed helps cut felt recoil and eases wear on internal components.
The polymer stock keeps weight reasonable while standing up to duty and range use. The included buffer tube, spring, castle nut, and end plate complete the assembly with Mil-Spec parts.
Because every piece is matched, the system delivers consistent operation and better control during rapid fire.
Practical Use, Care, and Compatibility
Installation completes the rear of your lower in one step, from the buffer tube to the stock. Torque the castle nut to spec and stake it, and the assembly is ready for the range.
Care is simple: keep the buffer tube and spring clean during normal service and check the castle nut staking periodically. The tungsten buffer needs no special attention beyond that.
Explore more complete kits in our AR parts and upgrades category. The Spike Tactical AR-15 M4 kit pairs well with an enhanced grip and trigger to round out a smooth-running rifle.
Smoother Cycling Out of the Box
The tungsten buffer at the core of this kit is the detail that sets it apart. Its extra mass slows the bolt carrier, which softens recoil and smooths the cycle.
That translates to less felt recoil, reduced wear on internal parts, and better control during rapid fire. It is a favorite upgrade for good reason.
Because the kit ships as a matched assembly, you avoid the compatibility headaches of piecing a stock together. Everything is chosen to work as a unit, so you can finish the rear of your lower with confidence.
Getting the Most From It
Installation completes the rear of your lower in one step, from buffer tube to stock. Torque the castle nut to spec and stake it, then head to the range with confidence.
Keep the buffer tube and spring clean during normal service and check the castle nut staking periodically. The tungsten buffer needs no special attention beyond that.
This kit ships direct where state and local law allows, arriving ready to finish your build.
It pairs well with an enhanced grip and trigger to round out a smooth-cycling rifle.
The matched components take the guesswork out of the build so you can focus on shooting.
For a matched, ready-to-run stock assembly, the Spike Tactical AR-15 M4 kit is a strong choice. Ships direct to your door, no FFL required.
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