These people are by no means gun smiths. I can't say that they aren't friendly but if you do buy any gun parts from there and they offer to put it on for you do not let them! Take it to a actual competent gun smith and save yourself the trouble and money. They don't even know which way to hammer the gas block pins on an AR-15 and caused me to have to have a $300 dollar repair to get a free float quad rail put on my rifle. The best part is that when i brought this to the owners attention and asked if they could help me out in anyway they tried to lie their way out of it and were completely unwilling to offer any help or even a refund on the part i bought from them.