Let me start by saying this one was on me I knew better, I have a Stag Arms AR-15 and getting it to where I want it payday to payday. Well it's a flat-top and Im a firm believer that any electronic sight can screw up and with my luck it would be when SHTF. I started looking at diff iron sights for back up and they run between $120.00 up to $280.00 a set. I was in a local gun store and found a pair that seemed to be a good heavy made sight they are GM-FRS1 put out by Global Military Gear (Mil Spec) for $60.00 bucks so I picked them up and put them on my AR. Front sight went on good back sight started out a little tight then after a few stiff turns it freed up and tightened down on the rifle good and tight. Upon getting the sights on I inspected both front and back sight, front sight perfect back sight was cracked at the base. The gun shop told me they couldn't replace it contact the company. I did so talked to a guy in NY who said that was a first just E-mail him my address and he would put a new sight in the mail the following morning. I told him I would send the back sight back to him as soon as I got the new one. Two weeks passed no sight so I sent a second E-mail told the guy if he changed his mind about replacing the sight E-mail the part number and I would order and pay for just the rear sight. Week three still no contact I talked to a couple other guy's at the gun store had the same problem with the sight system and got the same top notch service I did. So if you are looking for AR parts avoid this company and remember you pay for what you get.