wondering what paint that chrono was with... unregged blowbacks aren't that inconsistent, I'm betting it was the stock barrel with unmatched paint.
That being said, I'm not hyped about the A-5 threading, other than that I love how this marker looks compared to other mag-fed rifles. I'm interested depending on price and mag cost.
FYI, the "nipple" on First Strike rounds was done so that most of the impact would be forced onto that one small area, increasing the likelihood of a break instead of a bounce at long range. The projectile still collapses, so its not a dangerous point or anything, it's simply designed to improve long range breakage. I don't know if it negatively impacts flight characteristics or not.