UPDATE (more on thread drift below at bottom but back to topic).
The topic is CHEAP Red Dot adapter plate and CHEAP LED RMR sight.
Range Report: Total failure and total success. What? Yes it failed, more below, but learned a lot. Also I am hoping for eBay and seller guarantee to refund my money on my RMR sight (Ruggedized Miniature Reflex)
RMR Adapter Plate ($9 eBay) does not fit slide dovetail tightly. Nuff said. It can wiggle a little even with the one little tiny factory screw that held the original plastic fixed adjustable rear sight in. Of course holding a metal plate with a RMR sight on it, is more weight and inertia that a low profile plastic sight (that fits tight in the dovetail).
If not familiar with Taurus TX22 the dove tail is WIDE to accommodate the adjustable sight (made of plastic). It fits in snug but can be removed and slid back into dovetail with finger pressure. Taurus provides a small screw which screws into small threaded hole in side, to keep the rear site from moving out of dovetail. The adapter plate is 7075 aluminum. It fits with some clearance, so the only thing holding it in is the one small screw. It would have been better to be too large to fit and having to filed and "gun smith" it for a tight fit. However it is such, loose by gun standards. I did shim it with black electrical tape and seemed snug. However after 16 rounds it was loose. I did use Loctite on the little screw, but that screw is not big enough or strong enough to do anything by keep the original plastic sight from sliding out sideways. The dovetail fit of the sight into slide HAS TO BE very tight, i.e., interference, requiring a press or sight pusher to install.... If the fit was a tight interference the one screw might be OK. More on the fix later.
RMR sight ($29) It was OK, at first. There is way more parallax at the edges of the window than my other cheap RMR which I love love love.... both red and green dot and different selectable reticle (dot, dot with circle, cross "+" etc.). I would not dare mount it to a slide because I am not sure it is "ruggedized". It does fine duty on my Browning Buckmark. Very accurate.
Parallax: What I mean in this context, is that your RED DOT is on the impact point. Simple easy and can't understand why ppl say Red Dot takes practice? OK disagree, but when you move or aim the gun the dot moves, to the impact point. Once it is aimed you can move your head, eye and the dot still remains on impact point, pretty cool. You can NOT do that with fixed sights, your eye needs to be aligned with sight and sight aligned with target. With RED DOT you can be off axis from the gun axis and DOT will not move, with limitations... This cheap red dot has a sweet spot in the center area of the glass, but towards edges the dot will drift off target. Not totally unusual but my other red dots are much better in this respect. The difference is the other cheap red/green dot sight has a much larger window and not a mini form factor, more for fixed rail mounting.
The fail of the RMR sight - It would shut it self off after a few rounds 5 or 15, random. I could turn it back on with a touch of a button. At some point I could not turn it back on. Back home I checked the battery (CR2023) was a little low on volts, 2.95v. Nominal is 3.00v. When new they are 3.30v. I put a new battery in, no joy. So back to seller on eBay it goes. I have my sights set on some $150 to $200 sights (see what I did there ha ha). These sights are well reviewed value RMR sights. I say value under $225 and as low as $150. I am sure they will do better than a $30 sight, but may be not.
I may accept a replacement exchange and try again. Over all the build of sight was good, or 'rugged'. The red dot reticle was OK but not as clean as I like at higher brightness, but acceptable for the price. Could be failure was a one off issue and the next one will do the trick.... The sight came with two nice adapter plates (Glock and Rail), hardware, hex wrenches, and real nice padded plastic carry box, pretty impressive, well until it stopped working. Considering this cost 1/5th to 1/20th of similar red dots. No doubt more expensive red dots are "better", but cheap ones could be a good value and do the job. I am not spending over $300 or more for a red dot... If I can't get it done for under $300 (or better under $200) fixed iron sights for me. However I know with my Holosun on my AR15 that cost me a little over $100 back in the day (now about $150) and my other bargain $30 red/green dot you can get good quality for a lot less.
Fix for Plate: I am likely going to buy one of the other more expensive adapter plates.
1) DPP Titanium Sight Mount for Taurus G $22 amazon.
2) Ade Advanced Optics Optic Mount Plate $27 amazon
3) Mod the slide to make the plate I have work
I can see a fairly easy fix for my el-cheap-O adapter plate, but it requires drilling and threading two holes into the slide (not difficult). The TX22 has a very wide dovetail. The adapter plate has many other holes to make it generic for different sights. Two of the threaded holes fall in that flat area at bottom of the dovetail forward of the existing single center line hole. These two holes are off centerline, that could be drilled and threaded easily. There is the plastic block inside the slide behind this area, you can see through the existing threaded hole. I believe that block is removable. I can drill and tap two holes and get a good 3 to 4 turns of the screw into the slide before it would hit the block inside the slide. The plate would be nailed down, with 2 larger screws off center of plate verses one little screw. This would eliminate the wobble and likely keep it tight. This modification of slide would not be visible. If you put original fixed sight back in, the holes are covered. Kind of tempted to do it. However the idea of the dovetail is take all the forward and aft loads both in plane and out of plane (prying up). The screw is just there to keep it from sliding out sideways. The screws are really not meant to take a lot of load. With the adapter plate having play inside the dovetail the screws will take load. However with two bigger screws (and the original smaller screw which might get oversized), it may work. Shims can also take up some of the play as well. Did Taurus machine this dovetail a bit too wide? It only takes a few thousands of an inch to make enough slop to cause the plate to move. I may buy one of the above plates from Amazon and see if it fits tight. If it does I will use that, save the drilling. I don't necessarily want to drill holes into my slide. However if other brand plates are also loose, then the drill and tap of holes may be a good way to go.
Other option is forget RMR sight and go with aftermarket high visibility fixed sights, like fiber tube sights:
Yankai Fiber Optic 3 Dot Metal Sights for $24 Amazon.
Cheap, but not a fan of tiny dots on big fixed sights.
There is A LOT of space between the dots making alignment more tedious in my opinion. The original sights are not bad, but the rear sight cutout is really wide and the front sight narrow, with a tiny white dots on front and rear sights, it's more tedious to get it all lined up. You have to align it equal distance between the edges of rear sight and level between dots with these wide spaces between them. I fixed or improved that to my preference by getting the good old white paint pen out... and tiny white dots on front and rear sights were filled in to wider white blocks or lines, making it easy to get them aligned in elevation and laterally. for quicker and for me a little more accurate sight alignment, or at least faster sight alignment. .
OK Thread drift alert thread drift alert. You Love'em your fixed iron (or plastic) sights. Got it. Cool beans. I can shoot both, but if I don't have my glasses (which is often the case since I really (really) need them only for reading) the red dot does improve target acquisition and allows me to shoot accurately without struggling, even without my glasses. Without my glasses, with fixed sights, If I have time, aim, breath control, trigger control I can shoot accurately, but it's a bit of a struggle. Even with regressive glasses it is not as fun as when my eyes were good near and far. Red Dot no better accuracy at short to medium range (under 100 feet), but easier for old eyes without progressive glasses, which I hate wearing. For me and my eyes, anything over 33 yrds, optics of some kind, scope, RMR sight does make me more (way more) accurate. I have AR15 with red dot co witnessed with iron, love it. I put a scope on my Browning Buckmark 22LR pistol when not using my red dot on it, accurately hit targets out at 100 yrs. With no optics I can't hit targets at longer ranges with iron sights consistently. With bench rest, taking my sweet sweet time, OK, fixed sights I can get hits on targer. However the red dot or even better a scope makes it easier and faster to be more accurate and consistent.
Not sure why the resistance to red/green dot sights. The real question is are the worth the time, effort, expense to acquire and use them for the kind of shooting you do. Only you can be the judge. It is like computers. I hear they are going to catch on. Ha ha. I have been using computers since the 1970's as a kid programing main frames. I still like reading books on paper and getting out a pen and paper on occasions to write. Same with fixed sights, they work and can be accurate and effective. However fixed Iron sights, even if adjustable, to a degree can not do with Red Dot sights do. The new fangled stuff is better in many ways, but like paper books and pen and paper they don't need batteries, get viruses or fail and let out smoke (unless you put a match to it). This is my story and sticking to it.
PS I reject it takes time to learn RED DOT sights, that is their joy.... they are easy to use and all the sight alignment issues or techniques of fixed sights is not needed.