to all with an AA S400! does anyone find that their S400 changes groupings from day to day or if its been taken out of the gun bag! well i consulted luise( the AA importer) on this problem and his suggestion was probably my scope(hawke reflex 6x42), could also be something loose like the figure 8 piece holding the barrel and cylinder in place, the 2 grub screws could have been loose, but after tightening all the screws(the scope still remains the same), i found that the gun was doing the exact same. but on closer inspection i saw that the o-ring holdin the barrel on the figure 8 just never had a snug fit. do AA do this for safty and if so what would it prevent? well i baught a thiker o-ring and after some struggling i managed to get it to slide on, now its toit like a toiger and hassle free, groupings stay exactly where i left them the day before!