Advanced Technology Mil-Spec Carbine Buffer Tube Kit

Manufactured by Advanced Technology
SKU: ADVA5102240
MPN: ADVA5102240
Manufactured by Advanced Technology
24 Reviews
$51.77 $59.99

In Stock

Standard orders will ship out 2 business days if ordered by 3:30 pm CST, Monday-Friday. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination.



The Advanced Technology Mil-Spec AR-15 buffer tube kit comes with all that you need to install a stock on your lower receiver. It features a 6-position Mil-Spec buffer tube for your favorite collapsible carbine stock. It includes a carbine buffer and recoil spring and the end plate and locking ring. The buffer tube receiver extension features a lip that extends further into the receiver to reduce carrier tilt and ensure buffer tube alignment. The carbine recoil buffer in this buffer tube assembly is a standard 3 ounces, and when combined with the recoil spring, reliably cycles your BCG. Ensure a secure fit to your lower receiver with the included end plate and lock ring, stake the lock ring down, and never worry about it coming loose. All you need is your favorite carbine stock and your one step closer to finishing your build.

This AR-15 Mil-Spec Carbine Buffer Tube Kit Includes:
  • 6-position buffer tube compatible with Mil-Spec carbine stocks
  • 1.14” outside diameter
  • Standard carbine buffer weight – 3 oz.
  • Carbine recoil spring
  • End plate
  • Lock ring/castle nut

ATI Outdoors is the premier manufacturer of leading-edge rifle stocks, shotgun stocks, and accessories for a wide variety of firearms. Well known to collectors, hunting enthusiasts, and members of the Military and Law Enforcement communities; ATI Outdoors has a long and proud tradition of total commitment to top quality, excellent customer care and affordable prices.
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BrandAdvanced Technology
Buffer3.25 Carbine - Standard 3.00 oz
TypeStock Hardware Kit

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

Not Bad


This buffer assembly went on to my Anderson lower okay. The threads were a little rougher than expected, but i suppose its possible that could have been my receiver. Also the buffer is a bit noisy. However my Hogue stock slid on nicely and locks in all positions. 4/5 for the noisy buffer and ***potentially*** rough threads.

Chose ATI for my first ever AR build


I recently picked up a couple stripped lowers. Never had an AR and wanted one bad! My first build was going very smoothly. Lower parts kit installed. Just needed my reciever extension assembly and stock. Went to my LGS today and picked up this kit. I was done in about 10 minutes including the stock and I changed the grip as well! The ATI kit went together perfectly so I will be a future customer! My first lower is now finished and I'm super happy!

Don't buy


As usual very fast shipping from primary arms. As for the buffer tube the fit and finish was so terrible that I decided to not even use this this on my build. The only thing usable was the castle nut and spring.The buffer also rattled alot so I just gave up on this and got a spikes kit which was excellent.

Bad Fit

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The end plate will not slide onto the buffer tube
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