I personally do not have a Boss Bolt because i sold it. It may have been me rather than my Axe but I changed my bolt and had nothing but problems so reverted back to the standard Axe Bolt. In our team we have used the Axe for over 3 years and All of them had the standard Bolt with no issues.
My personal opinion is to keep with stock .
may be different for you and I have heard others with good reviews but my experience is keep it stock.
Cheers for the info. I was going from reviews elsewhere, but if you chaps have had issues I just may stick with the stock bolt as it is running fine at the minute. The only issue I have it's a little greedy on air.
TechPB put a video up on YouTube about axe/mini tuning, he explains how to tweak the HPA reg, dwell and back cap adjustment to get a balance between air use and smooth shooting...