Excellent choice - Safariland Model 6390rds Als Mid-ride Level I Retention Duty Holster For Sti Staccato Xc W/ Surefire X300u

Priced fairly great compared to buying direct. I used this holster for the Stealth Arms Playpus COMP model. It fits, although a bit tighter than an XC, as the Platypus has a slightly taller slide to frame dimensions, making the light sit a smidge lower. So this holster fits the XC and SA Platypus COMP model with surefire x300 turbo with no issues.

If you are crafty and handy with tools, I removed enough material to make it fit snug and perfect with a Steamlight TLR-1 HP-X. You just have to remove the initial "ramp" before the channel for the light. Many carry holsters use the light as the retention point, but safariland ALS models do not and use the slide, so yes, it can fit this light as well with modifications.