The AR-15 gas system is often overlooked for its simplicity, most common malfunctions in a direct impingement rifle can be blamed on its gas system setup. Having a quality leak-free gas block is vital for your rifles function and reliability. We stock a variety of AR-15 gas system components for building or replacement on your AR-15 rifle. Adjustable gas blocks have the ability to tame your over-gassed your AR15 for proper function. Along with gas blocks you can find gas tubes of all lengths, whether stainless steel or melonite.