Compact Weapon-Mounted Light

Months ago, I decided to add a weapon light to my EDC Pistol. I've been waiting and waiting for Glock's new compact light, Surefire's new compact light, and Holosun's new compact light. I got tired of waiting and due to excellent customer reviews, availability of the product, and prior use of Nightstick flashlights, I went with two of these Nightstick 550XL Compact Weapon Lights for both my dry fire Airsoft Training Pistol and my EDC Glock 19. Nightsticks' newer model TCM10 offers increased lumens, a programmable safe off function, and a strobe function, but I didn't need or want any of those features, so I stuck with this less expensive older model 550XL. This is a quality product which is simple to mount and use, comes with a quality battery, and various rail plates to fit a variety of firearms. I installed it on a compact Glock, and it comes from the factory setup for that. I did have to make a couple modifications to the light. I choose not to use my right hand trigger finger to operate a light and being that the right hand switch interfered with my trigger finger moving from the frame to the trigger, I ground the switch down to ensure an unobstructed path for my trigger finger. Also, the rail mounting screw protruded out the side of the rail mount when tightened down, so I shortened the screw as necessary to remain flush when tightened down. 550 Lumens is adequate for outdoor nighttime penetration and is still useable indoors without any blinding reflections. The beam pattern is excellent, with a large hotspot which blends smoothly into plenty of peripheral lighting. This light is a great fit for the Glock 19, looks sharp, and does what a weapon light needs to do. So far, after hundreds of Airsoft reps and live fire rounds at the range, the only issue I’ve encountered is the tendency for the light to loosen on the rail. I’ve re-installed it with a drop of Blue Loctite on the screw and hopefully that will solve the loosening issue. I recommend giving this Nightstick a try if you are in the market for a compact weapon light. I've attached a few photos of the light mounted on my Airsoft Dry Fire Training Pistol.

Fits perfectly on a Beretta PX4 9mm, and most importantly, it does not kill batteries (unlike certain other brands which I will not name) while not being used. I have had unfortunate experiences with some well-known flashlight manufacturers that simply run batteries down to zero while sitting unused on a shelf. This makes the light useless when its actually needed. High marks to Nightstick for avoiding this issue. HIGHLY RECOMMENDED due to inherent reliability.

UPDATE 4/15/2020
The light DOES fit on the XD. You have to kinda force it on. Use the C1 fitting, undo the bolt all the way, put the bolt side on first, CLAMP the light onto the rail (clamp the light to the gun as hard as you can), and tighten the bolt WHILE clamping the light to the firearm. Customer service with Nightstick is PHENOMENAL and they actually called me to make sure I got the light to fit on correctly. Their customer server is second to none and the products they stand behind are just as great. I am now a lifetime customer because of their customer support.
Original review:
Does not fit the Springfield XD (Does Mod2 according to the fitting chart, but I'm referring to the first XD); the light slides on on and off without the fittings, but once a fitting is put on, the light no longer slides in and the lip of the light does not go over the lip of the rail on the XD. Disappointing, as this light looks amazing on the gun, is very bright with a white, cooler temperature, and is very well built.

Compact, 550 lumens and just 2.5 ounces makes the TCM-550XL a dream for every day carry. I train often on an outdoor range with a lot of holster draws as well as hundred of dry draws per week, so my gear sees heavy use. The 550XL is as solid as a rock and the controls are worlds better than the competition. My TLR-1HL has officially been placed on backup duty.