This rifle will look so mean it will punch hole's in the targets just pointing it. I bought a top rail gas block but got home and found I had the wrong diameter. The DD rail surrounds the gas block. I want a railed gas block the one I have if it were the correct diameter would still be a bit of a problem as one of the screws to tighten it down cannot be reached because of the DD rail. What are you guys using? Height is okay but the diameter cannot be too wide.