Optic Mounting Plate for Beretta APX Pistol - Compatible with Trijicon RMR/SRO, Holosun 407C/507C/508T, Riton X3 Tactix PRD, Swampox Kingslayer/Liberty/Justice, RD3-019 Stingray, ADE RD3-020 Raptor, RD3-022 Artemis, RD3-023 Valkyrie, RD3-029

The mount is solid and did its job well once installed. Wish they included a simple instruction sheet — I had to watch a few videos online to make sure I was torquing screws correctly. That said, it performs exactly as it should.

If you own an APX and want a red dot on it, this plate is what you are looking for. Very precise CNC work, no play between plate and slide after install. Great upgrade for duty or competition.

Installation was quick with a punch and small wrench. Mounted my dot and was range ready in under 20 minutes. Zero held spot-on all afternoon. Would definitely buy again if I change pistols.

Plate itself is great — nice machining, firm fit. My only gripe is the finish could be a little smoother on the edges (minor). Works like a champ with my RMR clone.

Compared to other adapter plates I’ve seen, this one is priced extremely well. Fit with multiple dots I have on hand, too. Would love clearer specs on included hardware, but otherwise great buy.

This HM21 feels like it’s built right — heavy-duty aluminum, no rattles. Fitment on my APX full size was excellent, and after 500+ rounds I haven’t seen any loosening. Highly recommend for shooters wanting consistent performance.

Good plate overall with nice finish and tight tolerances. Only downside was lack of clear instructions — spent a little too much time figuring out torque and thread locker. Once done, works perfectly.

After installing the HM21 and my red dot, my accuracy drastically improved at 15–25 yards. It’s extremely secure and doesn’t move at all under recoil. Makes picking up sights super quick. Worth the money for sure.

Mount is great and exactly what I needed for my Holosun 508T, but the included screws didn’t fit my optic — had to source the correct ones. Once I did, installation was smooth. Could be better if all screw sizes were included.

Plate itself is very solid and seems to be CNC machined well. I did spend a little extra time getting it perfectly centered before tightening screws. Once aligned, it held zero perfectly through recoil. Not a beginner install, but if you take your time it’s worth it.

I had an older APX Compact and struggled to find a plate that fit. This one worked great with my Trijicon RMR footprint red dot. Instructions were minimal but straight-forward if you’ve ever done basic firearm mods. Super happy with the purchase and how rigid it feels on the slide.

I bought the HM21 plate to mount my Holosun 507C on my Beretta APX Full Size. Fit was spot-on and took about 10 minutes to install with basic tools. Screws lined up perfectly, and the plate feels solid — no wiggle even after a couple hundred rounds at the range. I highly recommend this for anyone who wants an affordable, reliable adapter plate.