Ever put together an AR build, only to find that your semi-auto cycling system just doesn't cycle? Looks like that gas-block installation didn't go as well as you thought it did. Avoid future frustration by adding the Two Two Three Innovations Gas Block Genie to your AR building kit. Unlike other gas-block alignment tools on the market, the Two Two Three Innovations Gas Block Genie can be used again and again, as many times as you want, during your AR build. All it takes is three simple steps. The type of gas block doesn't even matter when using the Gas Block Genie. Whether you're working with clamp-on designs, rail-block designs or micro-size options, the Gas Block Genie can handle it all!