If you are planning on having the hand-guard cover your gas block, it is more than likely you will need to get one that is low profile. Ofcourse, it really depends on the dimensions of the one you have. FWIW, The JP VTAC tube is smaller in diameter than most hand guards, which will limit what you can use. I used a standard low profile gas block and it works great. If you choose to go with the JP VTAC, you wont be sorry about your choice, I have really enjoyed mine! <thumbsup>