This gas block is specifically designed to work with our Leonidas integral rifle system. We found that all the low profile gas blocks currently on the market are not low enough for our needs, so we made our own. This is made from 416 Stainless Steel and comes with two locking set screws and the gas tube pin in the kit. Fits all .750″ gas journal barrels currently available. If your barrel does not have dimples in the bottom for set screws, then we recommend taking your barrel to a qualified gunsmith to have them added in the correctly timed locations so your gas block will time to the 12 o’clock position. Gunsmith installation recommended. Does not include gas tube.