Stay away!!! - Firefield Impulse 1x22mm Dot Sight w/Red Laser

I truly regret buying this red dot optic!! only 10 rounds into the shooting range and the optic was getting loose so I tighten it up as much as I could by hand but only after a few more shots it started to get loose again so I used a screwdriver this time not knowing that I was damaging my picatinny rail on my rifle!! this piece of garbage will become loose no matter how tight it is! And let's not talk about sighting it because it does not hold zero!!.. you get what you pay for I do not recommend this product at all! not even to my worst enemies!. NOTE: I was using an AR-9 style pistol which is a small caliber I don't want to imagine how bad it gets with a heavy recoil rifle like a .308 or a 12G shotgun!.