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."
|Carbine to Carbine interface|
|Fixed to Carbine Interface|
|Fixed to Fixed Interface|
|Carbine to Fixed Interface|
|ESS/ACC 2 way Folding Stock Interface (XTN)|
|ESS/ACC Folding Stock Interface (XTN)|
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.