Elvish Tac
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An optional upgraded version: VRX-Ultimate, adds a pump-action feature

VRX-15 Gunstock Pistol Plate for Half-Life: Alyx and Half-Life 2 VR

Valve VR games such as Half-Life Alyx, and Half-Life 2 VR, require the two VR controllers to be held at a very specific stance, while most VR shooter games such as Pavlov, do not have this requirement. As long as these two controllers are close enough, Pavlov will simulate the player holding a pistol in game, however, HL Alyx will not. 
Therefore, the VRX-15 gunstock in its pistol configuration, works well in most VR shooters, but not in HL games. 
You can print this plate and install it on your VRX-15 to play Valve VR games. 

https://makerworld.com/en/models/928970#profileId-892592

It should take no more than 30 mins for most printers. Make sure to print at high temperature to improve the layer-bonding, and print the infill first with Bambu printers, otherwise you will have to clean the overhang portion at the screw hole.
To install this plate, unscrew the original plate, transfer the N magnet, the M4 nylon nut, and the M4x12 screw, to this plate, and use the 2x M4x18 screws to secure it to the grip. It should take 1 minute. 

The reason we didn't provide this plate by default for the VRX-15 Gunstock is that: this plate is not aesthetically pleasing. It is only required by Valve games. It cannot be ambidextrous. Therefore, we provided a more beautiful and ambidextrous plate by default.