This bolt fills in the small outlines where the stock bolt does not. (T98 - bravo one)
No issues with the sliding along the power tube or inside barrel.
Some folks report needing sand down power tube with 2000 grit just to smooth it out. The inner o-ring makes a tight fit and can prevent it from re-cocking on the blow back. I did not have this issue.
I noticed more consistent shots (in terms of accuracy), however velocity did not need to be turned down after installing, and did not notice an improvement in air consumption. I was playing on a cold day (10*C); it could have had an effect.
I will write a second review after this weekend.
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