$31.99
34 in stock
Online inventory may differ from in-store availability.
Quick turnaround so you get your gear sooner.
Trusted checkout with industry-standard protection.
Keeping Traditions Alive Since 1953
Secure Transactions provided with 
The TacFire AR-15 Mil-Spec Buffer Tube Kit takes the guesswork out of setting up a collapsible stock. Instead of piecing together a tube here, a buffer there, and a castle nut you forgot to order, this kit puts all the receiver extension hardware in a single package. It's built around a Mil-Spec 6-position tube, so it plays nice with the standard Mil-Spec lowers and stocks that make up the majority of AR-15 and M4 builds out there. The matte black finish keeps things low-key and blends in with the typical black furniture most folks are already running.
This is a full carbine buffer system, not just a bare tube. You get the 6-position stock with a buttpad, the Mil-Spec 6-position buffer tube, a carbine-length buffer spring, a 3 oz carbine buffer, a standard end plate, and a castle nut. The 3 oz buffer weight is the standard carbine setup that keeps a direct-impingement AR cycling smoothly, and the adjustable stock lets you dial in length of pull for different shooters, heavy winter layers, or slinging up in a hurry.
Because it's Mil-Spec sized, it drops onto standard AR-15 and M4 lowers without drama. Builders have reported clean, no-fuss fitment on common receivers like Anderson lowers, and installation is straightforward if you've got the right tools. You'll want an armorer's wrench and a vise block, and it's worth staking the castle nut once you've torqued it down so it doesn't back off under recoil. Standard practice is roughly 38 to 42 ft-lbs on that castle nut.
Whether you're finishing a fresh build, swapping out a worn stock, or putting together a spare lower, this kit covers the receiver extension side of the equation in one shot. It's a practical, no-nonsense choice for anyone who wants reliable Mil-Spec parts without cherry-picking components across a half-dozen listings.
It's built to Mil-Spec dimensions, so it fits standard Mil-Spec AR-15 and M4 lower receivers, which covers the vast majority of rifles on the market. Builders have reported clean fitment on common lowers like Anderson-made receivers. If your lower is commercial-spec rather than Mil-Spec, the tube diameter won't match, so confirm which spec your receiver uses before ordering.
The kit itself is complete for the receiver extension: stock, buffer tube, 3 oz buffer, carbine spring, end plate, and castle nut are all in the box. The one thing to know is that the buffer retainer detent and its spring live in your lower parts kit, not this kit. If you're finishing a bare lower, make sure those small parts are already installed.
You'll want an AR-15 armorer's wrench to torque the castle nut and a vise with a lower receiver vise block to hold things steady. The castle nut is typically torqued to around 38 to 42 ft-lbs. For a build that sees real use, staking the castle nut afterward keeps it from working loose under recoil.
The 3 oz buffer is the standard carbine buffer weight and works with the included carbine-length spring to control the bolt carrier's cycle. It helps the rifle run smoothly and manages recoil during operation. This is the go-to setup for most standard carbine-length direct-impingement AR-15 builds.
| UPC | 686294505478 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MAR050B |
| Shipping Weight | 1.355 |
You must be logged in to post a review.
Reviews
There are no reviews yet.