Another tip to aid accuracy is to remove the 'O' ring in the front barrel support giving it more clearance to float. A 10 minute job. Its just a case of pulling the filler cover off, slackening two Allen screws and easing the bracket over the cover O rings. I removed the recessed O ring and relieved the hole slightly. It improved the accuracy of mine and a fellow club member did the same to his and we both saw an improvement in accuracy.

HTH
Ian