C+H Precision Optics Adapter Plate for Gen5 Glock MOS G17 G19 and Trijicon RMR/SRO, Holosun 407C/507C/508C/508T

So Glocks are great, and having a factory optic cut is awesome. The Glock MOS system suffers because the optic plates suck. Your OEM plates are badly molded metal, often don’t sit flush, lose threading, and place the lion’s share of stress on the screws holding the optic to the plate. CHPWS solved this issue entirely. Hands down their plates are the best engineered solution, and they really have solved every possible issue with V4. The optic fits snug on the plate, and has to be pressed onto the posts; that’s some amazing part tolerance. The T-posts give you a total of four posts for the optic to hold onto in recoil, and are removable should you somehow strip or mangle one. It’s unlikely you’ll strip the post, but should you snap off a screw head, the posts have a hole in the bottom allowing you to put a drill bit under the screw and push it out. The plates are thinner than factory, they hold the optic on the front and back, and short of milling a slide are the best option out there. The plates ship with three screws for the optic so you have an extra, and stainless screws to mount the plate on the slide. Unlike the factory plates, CHPWS plates pretty much hold zero if you have to remove the optic for a battery change. It won’t be a perfect zero, but your impact will be within an inch or so of where it should be. That’s good enough to allow you to swap a dead battery without having to run to the range immediately. Factory plates can be off by four to five inches after removing the optic. So buy this thing if you have an MOS Glock. It’s not even a question.

High Quality. One of the best you can buy in my opinion.

Perfect fit. So far no issues.

I’ve now had this plate mounted 2 years on my Glock 34 which I run as a limited optics pistol in USPSA. I have ~7,500 rounds on this setup based on how many boxes of primers I’ve gone through. The optic plate has been 100% reliable so far, never had any issues with dot coming loose under recoil. Typically I shoot 135 Power Factor 147s so nothing super hot but I use my gear pretty hard between competitions, practice, and dry fire. There are many good plates out there that fix the issues with MOS, this is one of them. If I had any recommendations it would be either DONT use thread locker or get purple. IF you have a screw that isn’t coming out always apply heat via hair dryer or heat gun. Invest in a set of fix it sticks. The mounting screws that come with most of these optic setups aren’t very heavy duty so be patient. After you tighten the screws to the recommended torque values, ALWAYS use a silver sharpie to witness mark so if you’re at the range and getting erratic groups you can look and confirm if the screws moved.

I really want to give this a 5 star review, but I can’t. The over all fit is fantastic. The quality of the plate is great and extremely sturdy. However, I wish the same could be said for the mounting screws. Be very careful if you are using a torque limiting driver. Be sure you set the lb’s of torque 15 or less. I unfortunately left mine at 20 and snapped a screw in half. I was able to fix the issue, but none the less it was a nuisance.

First, the screws for mounting the plate to the slide are missing. Thankfully I have multiple mos screws that are the same spec, so mounting the C&H plate was possible without having to call for replacement. The thread locker was missing, but I have thread locker that met C&H’s recommendation. The T-nuts did not sit flush in the recess on the plate. I had to file the excess metal on the plate to allow the T-nuts to sit flush. I finally got the plate mounted flush. Second, labeling was absent on the holosun and rmr screws. I had to go online and make sure I had the right screws for my holosun 507c optic. The QR scan led to a series of instructional videos that were sub par. When C&H is telling you during the instructions that you may have to modify screws and the plate to get the right fit that is a red flag. At this price point everything should fit right the first time. I should not have to machine your screws or plate. Third, I mounted the holosun to the plate. There is a gap under the optic at the lugs. I can see light from the lugs to the mid point on the optic. I used I torque tool and set screws at 10 lbs as instructed by C&H. I took optic off and inspected the lug holes on optic. The optic is not the problem. The lugs on the plate are the problem. I used digital calipers to measure each lug of plate. The right lug is higher than the left, which means I will have to file the lug to get my optic flush. Finally, this company bolsters precision, reliability and easy installation. This product is anything but precise, reliable, or easy to install. Save yourself the time, trouble and money. I placed my mos plate back on my glock 19. I do not care for the gap between the front of my optic and the slide when using the mos plate, which lead to this purchase. That was my only problem with the mos plate. I got caught by the advertising that a tighter fit from the C&H plate would add to the security of the optic. Maybe I got the lemon.

No better replacement plate for the Glock OEM plate!

Great fitment, mated perfectly to Mr. Glock, happily secures a Holosun