The KRISS Vector Ambidextrous Folding Adapter is an accessory for the Gen 2.1 KRISS Vector that allows you to add side-folding capability to an AR carbine buffer tube-mounted stock.
This accessory is not for use for the Gen 2.1 KRISS Vector Ambidextrous Folding Stock and cannot be used with the Gen 1 nor early Gen 2 KRISS Vector uppers. It cannot be used to adapt the Gen 1 / early Gen 2 Vector Hinged Folding Stock to the Gen 2.1 Vector.
Safety Procedures
Before you service your Vector, remove the magazine and confirm that the chamber is clear.
Compliance Notice
If you are using this product to mount a stock onto the KRISS Vector SDP, this model is manufactured as a pistol (handgun). Installing a stock onto a handgun constitutes the manufacture of a Short Barrel Rifle (SBR), which is an NFA item, and requires an approved $200 tax stamp with ATF prior to construction.
It is your responsibility to maintain a compliant firearm.
Tools Required
- 1.5mm allen key
- 2.5mm allen key
- Only needed if you will be changing the folding direction.
- 4.0mm allen key
- AR-15 armorer's wrench
What is Included?
- (1) Ambidextrous folding adapter
- (1) Anti-rotation Set screw (preinstalled in adapter)
- (1) Mounting screw
- (1) Cosmetic ring
Changing Folding Direction
The adapter is configured from factory for the stock to fold to the right. If you wish to change the folding direction to the left, follow these instructions. Otherwise, continue to the next section.
Unscrew the push button with a 2.5mm allen key, then remove the adapter lock.
Rotate the adapter 180 degrees so the hinge is on the left. Insert the adapter lock through the underside and reinstall the button.
Test for function and confirm that the adapter folds and locks correctly.
Prepare Vector Upper for Installation
If you have a Vector SDP follow these instructions to remove the single point sling mount:
Removing Single Point Sling Mount from Gen 2.1 Vector Upper
If you have a Vector CRB or SBR, follow these instructions to remove the AR carbine buffer tube and KRISS DS150 stock:
Removing AR Buffer Tube from Gen 2.1 Vector Upper
Installing the Ambidextrous Folding Adapter
First, place the included cosmetic ring onto the adapter. An optional sling mount (sold separately) can be installed instead of the cosmetic ring.
Set the included mounting screw into the adapter. There are two holes; only the upper hole is used for the mounting screw.
Insert the adapter into the rear of the Vector's upper housing. Tighten the mounting screw using a 4.0mm allen key.
- Torque spec: 6 Nm (53 in-lbs)
Test the adapter and ensure that it is securely mounted and that the folding end moves and locks as expected.
Installing the AR Carbine Buffer Tube
Locate and remove the anti-rotation set screw using a 1.5mm allen key.
Thread the buffer tube into the adapter. Once it is sufficiently threaded into the adapter, line up the notch in the buffer tube's threading with the threaded hole for the anti-rotation set screw.
Lightly install the anti-rotation set screw and confirm that the buffer tube is aligned upright before tightening the set screw. Do not overtighten the set screw.
Tighten the castle nut using an AR armorer's wrench to slightly beyond hand tight.