Holosun 509 ACSS Vulcan Red Dot w/ Glock MOS Mounting Plate, Fits Glock MOS Slide (not 43X/48) - HE509-RD-ACSS-M

Great red dot for beginners.

I love the outer ring. You do have the option to remove it. I wish it had a 2 moa dot instead of the chevron but not a big deal… you get used to it. 100% recommended. Love Freedom Gorilla. Great customer service. I wish they had a layaway plan and/or option to pay with PayPal.

So far so good

I also got the ACSS version of the 509 recently. I entered the shipping address wrong and the seller, Freedom Gorilla, made it right for no extra charge, so good on them! My mild astigmatism is playing hell with the chevron-shaped reticle in a way that the Holosun 503 with a similar reticle never did, for whatever reason. It's one of the most diffused red dot reticles that I've yet used, unfortunately. That said, it came with the Glock MOS mounting plate that fit nicely into my slide and, best of all, the optic required no adjustments to be perfectly zeroed at 25 yards! So far, so good, but I've only shot with it once, so it'll be a while before I'm friends with it.