http://www.fasttech.com/products/1411/10007488/1785608 This mod is great for the price. The stock switch spring is weak. Had to replace it. Looking for magnets to convert. The treads on the one I got are not painted. Going from a aluminum m16 clone to this one is a better move. The Panzer RDA is amazing. I have a .22 ohm build on it and chucks vapor. I will be doing a video review soon. I give this setup a 8 out of 10. The downside is the paint flakes off to easy. Also the driptip isn't the greatest either.