I have seen pbreview.com review of titanium rear bolt for Tippmann 98 Custom. They claim that hammer having 60 % of original mass still works, and gives far less recoil that original part. I am not happy to spend 60$ for such single part, so I am considering to buy cheap steel rear bolt and ligten it drilling some holes to reduce mass. What do you think about such mod ? Has anybody tested such approach before ?