I wish I had read all of the reviews before deciding to order from them. I ordered a gas block and gas tube from them. The parts came relatively quickly. After opening the gas block, I tried to adjust the adjustment screw in and back out. Well that was a no go. Whoever assembled it, cross threaded the screw when putting it together. I've emailed 3 times with my order number and have called and eft a voicemail. Been over a week and I still have not heard anything back from them. I just want a replacement that works. Save yourself the time and 40 bucks and go to an honorable retail shop and buy a different brand. I now have a 40 dollar gas tube. :(