There are currently 2 new versions of the T20, the T20-M and T20-T which are both physically identical. The Olight T20-M is a solidly built light, with good ergonomics and a solid structure. As you can see from the image to the right, the head houses a unique reflector cup which is half smooth and half textured. The smooth surface area reflects a highly focused hot spot for optimal throw, while the textured surface area smoothens out any artifacts in the spill region of the beam profile. Its an innovative take on reflector design and produces a beam that is characteristic of Olight products. The emitter is just slightly off-center, but not by much. On the exterior, the head has a thin band of checkered knurling which provides some grip when you're twisting the head. The Type 3 hard anodized coating is smooth and consistent throughout, free of scratches or smudges. The threads on the head are a similar to those on the Fenix lights, not too thin or too thick relative to its overall size. There may be some squeaking initially due to some machining dust stuck between the threads, but a quick clean with a stiff bristled brush will fix this. The threads on the head also sometimes cross-threaded during my tests, however I don't think this would be much of a problem since you wouldn't need to completely remove the head while using the T20-M. The head's exterior is of a hexagonal shape which serves as an anti-roll feature.
The battery tube has a simple and clean looking design. There's only one flat face machined onto the tube, which is where the Olight branding is printed on. There is a band of knurling about 2cm wide for additional grip. The area towards the end is slightly slimmer, this provides good ergonomics for when you're holding the light in a cigar/pistol grip. The walls of the T20-M's battery tube is thinner than either the T10 or T15 models. The battery tube is wide enough to accommodate even the thickest 16340 cells without problem. While almost identical to the original T20, the T20-M has a raised ring machined towards the end of the battery tube which makes it easier to hold in a cigar grip. As with the head, coating on the battery tube is just as well done. Very smooth and consistent. The threads between the battery tube and the tail cap are cut very smooth. I noticed that the more force you apply while screwing on the tail cap, the higher the chances of it getting cross-threaded. Otherwise, it screws on perfectly fine and smooth. The tail has a hexagonal design similar to the head and provides good grip when unscrewing the tail cap for battery changes. Housed inside the tail cap is a forward push button switch module, thus allowing for momentary activation. Everything from its tension and positive tactile feedback, to the clicking sound it makes is identical, which is a good thing. The T20-M isn't able to tail stand since the switch cap protrudes out slightly from the tail cap.