The 2 biggest quick performance enhancements... #1 tighten the front gas block to barrel fit (don't use a center punch to dimple the barrel, rather use the socket method to lightly flatten the barrel splines using very light taps of a small hammer. Test fit after each light tap. There should be zero lateral movement in the gas block but it shouldn't be so tight you need a hammer to get it on or off. #2 ditch the gas block mounted bipod. The Swiss military found as much as a 20cm change in POI when testing the SG54X at 300 meters. There are a number of other tunes, but these are quick and general have the greatest result.