Having tried them all from Ace, the ARFX-E is worlds stronger, damn near just as light ( That thin tube it adds over the AR-UL-E , weighs almost nothing ) ...and if you throw on the 1" thick recoil pad ( Just click recoil pad options on the page, price doesnt change between 1/2" or 1" option ) it makes it a truely usable length of pull.
http://riflestocks.com/store/product94.html
