After 1000 rounds through the Nano this past week, I and others said the Nano had a "spring" noise to it.
The 6s seemed really good on the guns that were there using it.
This morning with Form he had me and another guy do a blind test between the two. It really seemed dependent on what direction (obviously safe direction) the shot was aimed. Most of the 10 shots I couldn't tell the difference. Tricky feller even traded places with the guy shooting my nano to keep us guessing.
That Nano does get toasty. Luckily though it was raining sideways a lot and the other days it wasn't stupidly hot. Form has me get rid of the cover on day 1
When I'm training this summer I'll definitely wrap it.
Also tried a 6S on the UM. Shot one without ear pro and yyyyeeeaaahhh sehr gute. A little ring but not any more than the Ultra 7. I'll probably see about getting one for the UM before season.