Attaching a folding stock adapter will depend on the chassis systems interface and buttstock. Depending on the inlet, we design our chassis systems that have Fixed or Carbine interfaces.
For Fixed interfaces, you will use "Fixed to Fixed" or "Fixed to Carbine."
For Carbine interfaces, you will use "Carbine to Carbine" or "Carbine to Fixed."
The ACC and ESS use a proprietary XTN interface. Both chassis systems can be ordered with the SRS-XF buttstock. Please note if you buy the ACC or ESS with a non-folding buttstock, an adapter can not be added; it is a whole new buttstock that would be required