We both have 870’s and are setting up for Tactical 3 Gun… Pic’s would be nice also! Thanks in advance, dzc391 aippi 11/22/2010 11:17:10 PM Mesa Tactical works off an Endine Buffer that has been around for over 30 years and the orgininal ones are still working. The SpecOps works off two springs and the main one can jump the pin in the receiver mount. There are no user repair parts so the stock is then FUBAR and good luck getting one from Black Hawk. Knoxx made a good product, damn shame who they sold it to. The transistion of the recoil to the rear and back is smoother with the Mesa Tactical w/Endine Buffer. The Mesa Tactical will last the life of the weapon. I can not say that for the SpecOps.