I Upgraded this rifle by replacing the stock barrel with a Lilja m-4 barrel and an LMT sopmod stock, and an ARMS 41b folding front sight. All groups were shot using the stock trigger and ACOG. This is only the second outing with it. Im going to shoot it out as far as I can this weekend to see how it does. Its does really well with 77smks with 23.7 gns of benchmark. The second set of targets was shot with some v-max, 62gn m855 clone, and some 55 gn fmjs. Not really a precision rig by definition... but it does really good.