I need to order a new recoil spring and shok buffs for some training I'm going to attend at the end of this week and may have to order parts other then Wilson just because of the time issue. Anyone know if the recoil spring is 18.5? Also the only failure I have ever had on my gun is that on occasion I have had the slide not go fully forward after firing a round. I had to strike the rear of the slide with the palm of my hand. Could a higher spring solve this? Say #20. Also does anyone know what thickness the shok buffs they use are? Thanks for any help in this matter.