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I ordered two of these Primary Arms red dot sights. I tried to zero the sight on an AK pistol. The red dot would shift after each shot. Impossible to zero the sight. I checked the sight afterwards and noticed the front lens was crooked in the body. I checked the other sight and it was the same. I am returning both of them. Optics Planet customer service was very helpful and I received the RMA immediately. I would not recommend this sight. I know the phrase “cheap Chinese junk” is a cliche but it is appropriate in this context.
Works great, reduces recoil. Easy to install. I bought a stripped bolt carrier from Apex gun parts so I didn’t have to drill the pin out of my carrier. Two pins are supplied with the KNS adjustable piston. Reduces wear and tear on your receiver by preventing carrier from slamming into back of receiver with extreme force. I also recommend buying a polyurethane buffer for your gun. This will help dampen recoil even further. Great product by KNS.