Streamlight TLR-VIR II Key for Ruger MK
$3.99
The stock keys don't allow the VIR to sit close enough to the frame without coming into contact with it. This places it as close as it can be without rubbing and throwing off your zero.
Shipping is free on orders with multiple items. This item is just so small I didn't want to price it higher to cover shipping for those buying multiple things.