looks dodgy AF, steer clear and report them
also the second looks like he's wrote it on normal paper and zoomed it in for a photo, and the username is wrong ?
nice 1, might be worth putting a few mags through it to bed the spring in more as chronos can vary quite a bit.
I've had mine firing at 345 at home and 360 on a site chrono on a .20
mine have never let me down. tested them with my DMR at point blank with .40 bbs and didn't even mark them.
Taken quite a few hits in game too and been fine