JMac - MDi-co

ST-6 for 5.5mm Folding AKs

(4 Reviews)
Current Stock:
4.02 Ounces
SBA3 Brace

(S)keletonized(T)ube(6)inches long and 6 positions with SM-5.5 (not assembled)

This M4 tube adapter replaces the standard buffer tube to ensure the stock folds as flat as possible!

Fits most M4 style stocks/braces 

Lightweight and Rigid

  • Integrated QD Sling Sockers
  • 6” Length
  • 6 positions 
  • 7075 T6 Aluminum
  • Type III Hardcoat Anodized

SM adapters utilize the factory rear trunnions and eliminate the need for additional adapters or folding mechs. 

This version of the SM stock/brace adapter is specifically made for the Russian 5.5mm pin folding stocks. 5.5mm trunnions can be found in the SGL (Saiga) rifles and on the new KUSA vityaz clone, not to mention, the trunnion itself is more readily available than the 4.5mm version.

This stock adapter, like the rest of the SM line, will allow you to install all of our Arm Bar and Stocks as well as SIG style stocks. Cheek wield is adjustable by moving the stock/brace up or down on the adapter.

  • 2 height positions
  • 7075 aluminum
  • Black hardcoat anodize finish
  • Includes mounting bolt for lower hole
  • Does *not* lock when folded.

Attaching a stock to a pistol makes it an SBR and requires NFA approval. You are responsible for knowing and following your local/state/federal laws!

JMac Customs LLC is not responsible for the end users misuse  of our products.

Reviews (4)

Very impressed

Written by Jay Seerley on Apr 18th 2022

Just received my ST-6 for 5.5mm Folding AKs and I’m very impressed. This is machined and finished so well. The quality is above and beyond the “competitors” product that I ordered and tried while waiting for yours to come back in stock. Thankfully I’m returning theirs after they told me to file it down a ton to get it to work. Just wanted to let you know I’m a customer for good now!


Written by Matt on Dec 10th 2021

Installed on a KP-9 SBR. The included SF adapter locks up solid with the ST-6. I attached a B5 Bravo stock and again fits very tight on the JMac skeleton tube. This setup gives a perfect repeatable cheek weld every time for me and the skeleton tube aesthetic goes with the Zenitco rail I had already installed. I had been looking at the Zenitco stocks, but I think the JMac tube with the Bravo stock is a lighter, simpler and more efficient setup if you are looking to SBR the KP-9. Very happy with how it runs. Thank you JMac!

Review for ST-6 5.5mm

Written by Ben Walker on Nov 26th 2021

I have been searching for a stronger, more comfortable setup for my Tactical Edge Comrade AK and I finally found it in JMac’s ST-6!! The stock folder on the Comrade was terrible and in desperate need of an upgrade! The ST-6 allowed for a MUCH better platform to run an AR stock. The ST-6 is a SOLID setup and still folds up nicely next to the receiver. I am so happy JMac offers this setup! I’m a fan for life!

ST-6 5.5 for AK

Written by Ron on Oct 21st 2021

Installed on KP9 in just a few minutes, perfect fit works great for AR stock or brace.

Related products

Customers also Viewed