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INSTALLING AND INTERCHANGING THE CROSS BLOCK OR T-SLOT RAIL
WITH INTEGRATED CROSS BLOCK
1. Loosen Rail-Adjustment Bolt by turning counterclockwise until Cross Block is fully exposed.
2. Remove Cross Block by lifting it out.
3. Place Cross Block into slot ensuring that the “P” or “U” letter on front edge of Cross Block is
facing forward (toward bezel).
4. Push Cross Block all the way forward and, while holding Cross Block in place, tighten Rail-Adjustment
Bolt by turning clockwise until T-Slot Rail overlaps Cross Block, locking it securely in place.
M17/P320
T-SLOT RAIL
UNIVERSAL
CROSS BLOCK
PICATINNY
CROSS BLOCK
Figure 1.
Note: The Picatinny or Universal Cross Blocks are not
necessary when installing the M17/P320 T-Slot Rail.
Store standard T-Slot, Picatinny and Universal
Cross Blocks for future use.
SIG SAUER P320 INSTALLATION
1. Using the supplied 7/64” hex key,
loosen Rail-Adjustment Bolt by turning
counterclockwise until T-Slot Rail is
removed completely from weapon light.
2. Remove the Rail Adjustment Bolt and
Lock Washer from the T-Slot Rail.
3. Install Rail Adjustment Bolt and Lock Washer into
M17/P320 T-Slot Rail (Figure 1), align with T-slot cut
in body and rotate Rail Adjustment Bolt with supplied
7/64” hex key clockwise until it engages in body.
ATTACHING TO HOST WEAPON RAIL
1. Using the supplied 7/64” hex key, adjust gap between stationary and T-Slot Rail by turning
Rail-Adjustment Bolt clockwise or counterclockwise until gap is sufficiently wide to fit over
weapon accessory rail.
2. Align Fixed Rail with weapon’s accessory rail and hinge XVL2-IRC over the cross slot of host weapon
3. Mate Cross Block with corresponding cross slot in weapon’s accessory rail.
4. Secure by turning Rail-Adjustment Bolt clockwise until the XVL2-IRC fits snugly onto host weapon rail.
Using a torque wrench and a 7/64” hex key, tighten to 8 in-lb onto a polymer pistol rail and to 8-9 in-lb
on a metal pistol rail. Do NOT overtighten! The Rail Adjustment Bolt will break if excessive force is
applied with a tool.
Note: If a torque wrench is not available, use the supplied 7/64” hex key
and hand tighten with light pressure until the screw stops rotating.
Note: The appropriate Cross Block MUST be installed to attach XVL2 to host weapon rail. Some pistols with a MIL-STD-1913
rail may require the Universal Cross Block to properly interface with the location of the front trigger guard surface. For Sig
Sauer M17/P320, use only supplied T-Slot Rail with integrated Cross Block with no additional Cross Block.
