The Hiperfire EDT3, EDT2, and standard EDT are very similar. The EDT3 is the same as an EDT2, except with different trigger essentially. The EDT3s were just released not too long ago but have been selling about as well as the EDT2s. Both the EDT2 & EDT3 will work with AR15 or AR10s. They are not going to be as nice as the 24 series Hiperfire triggers but they're awesome for under $100.