Sent a e mail and never got a response. Left a phone message and got no response. Finally got the owner on the phone and he set it fit the optics he had. I told him it Did Not fit the optic when Interstate Guns tried to install it on a new Gen 5 G34 and Interstate showed me it would not work. The owner said he would refund my money and I never received the refund. I have been purchasing firearms and firearms products for a very long time and never posted about anything like this lack of service but I am ready to post it everywhere if I do not receive my refund. They kept their product and my money.