AR15 Mini Milspec Buffer Tube Kit- Carbine

$59.95 - $69.95
(3 reviews)
Current Stock:
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For those wanting to make their AR15 as compact as possible. Our Mini Milspec System (based on our Original AR15 CQC system) provides you with a compact buffer system while not affecting reliability while still being able to utilize a Milspec BCG. The M4 stock is taken down from just over 6.5" to 5", Mini Buffer Tube is only 5.25" in length from end of the receiver when installed. The Mini Milspec M4 Stock can collapse completely flush in the last adjustment hole on the buffer tube making the front of the stock flush with the castle nut.

Mini Milspec Buffer Tube with Mini M4 Stock Installed, collapsed configuration- 5 5/8” from back of receiver

Normal Milspec M4 stock with 6 position buffer tube- 7 1/8”

Magpul SL-M will collapse flush with castle nut in 2nd adjustment slot, .5" longer than KAK Mini M4 Stock

The Mini Milspec Buffer System is compatible with 556/223,300 BLK, 762x39, and similar rifle calibers. The weight of these mini buffers and spring rate of the buffer spring mirror the functionality of a traditional carbine buffer weight/ H Buffer weight. Unlike most short buffer tube setups, ours is designed to function with any compatible Milspec bolt carrier group. 

  • Compatible with 5.56/223, 7.62x39, 300 Blackout, and Similar 
  • Proprietary Mini 5 Position Buffer Tube extends only 5.25" from the rear of the receiver. Buffer will accept Milspec parts and stocks.
  • 7075 Impact Extrusion, Hard coat anodized
  • Flatwire buffer spring for increased reliability and longer life
  • Proprietary mini buffer weighs only 2.5oz- Carbine/ 3.3oz- Heavy and performs like a standard carbine buffer in combination with our flatwire buffer spring
  • Mil-spec end plate
  • Mil-spec castle nut

This is a buffer tube kit, it includes the buffer tube, buffer, buffer spring, end plate, and castle nut, it does not include a stock.


  • 5
    Kak mini buffer

    Posted by Shooter McGavin on June 11, 2024

    Installed the mini tube and buffer on an 8.5” 300 BLK SBR build. Ran without a failure. Combined with Magpul SL-M stock it makes for an ultra compact setup. I’ll surely buy another if I SBR another lower.

  • 5
    LWRC at home

    Posted by Michael Kasdorf on December 11, 2023

    Purchased for my 14.5 p/w to get the shortest overall storage size along with a UTG S4 stock. Makes it look/feel like a 12.5 AR.

  • 5
    Just what the Doctor Ordered

    Posted by Larry on December 11, 2023

    Perfect CQB addition. Works just like a normal buffer tube system, just shorter. With the shortened scok, really becomes compact. Of note, you really need to use the buffer tool, installing the flat spring and buffer without it was a challenge. My order did not include it, didn't even know it existed until I was done and looking on the website for another kit.