Description
Direct fit SBT arm brace for your Springfield Kuna. Our low profile aluminum adapter integrates the SBT HK or CZ type arm brace directly into the receiver of your Kuna Pistol. The assembly will maintain the side folding characteristics stock/brace. Our brace adapter is machined from billet 6061T6 aluminum and hard coat anodized to MIL-A-8625, the SBT braces are polymer/elastomeric.
Choose from the drop down menu above to order either the SBT HK type brace or the SBT CZ type brace. Both are great options for the Kuna and images of both are available in the gallery for reference.
If you are looking for a true MP5 stock integration (SBR), we offer that as well here: HK MP5 Stock Retrofit kit.
Note: HBI stocks and braces for Springfield Kuna are made to factory spec, and are compatible with 100% of factory lower receivers. They may/may not directly fit aftermarket lower receivers. If using a Nexus aluminum lower receiver it may be necessary to remove about .005-.010″ of material from the inside of each “fork” flange on their lower in order to mount one of our Kuna stock adapters.
- SBT HK or CZ Type Brace for Springfield Kuna (HS Produkt)
- Side Folding with Seamless Integration into the Kuna Upper Receiver
- Drop In, No Additional Parts or Hardware Needed
- Machined Aluminum 6061-T6
- Anodized MIL-A-8625 Type 3 Hard Coat
Designed and Manufactured completely in USA.
Gunsmith Installation Recommended for All Parts.









Rocky (verified owner) –
I picked up the HK brace to go on my Kuna. Build quality is very good. The hinge is on the tight side but thats not a bad thing (more on that later), and lock up when deployed feels great. My brace fits very snug in the receiver and the takedown pin now needs a little love to fully seat but thats ok in my book. This is a huge upgrade from the strike brace that came from factory.
A couple things to know. The brace swings to the right which means that it does partially block the ejection port. There is not a locked position when collapsed so the hinge resistance is all that holds it there. Fitment is tight but it does make the whole system feel robust and no modification was required for use.
Easy 5/5 on this product, another great one from HBI.