Got my SRS gen3 covert + DTSS suppressor today.
Had a small issue where one of the hopup holes in the receiver wasn't aligned properly, making it impossible to put the long hopup screw in.
Had to drill it slightly, bit disappointing from a QC point of view. The issue would have been obvious if anyone tried to put the screw in.
Tried the m160 spring initially, 480fps on .20 with no hop, but damn it was hard to cock.
Dropped down to the 150 spring which does seem more usable.
With no hop I was getting a lot of joule creep, looking on a FB group I saw that someone else had a similar experience.
Comments on there seemed to indicate that this is normal.
My test results with M150
0.20 @ 416fps = 1.61J - seems low
0.43 @ 346fps = 2.39J
0.48 @ 335fps = 2.50J
With some hop added, the .20fps rose to 432fps, the other weights only rose by about 2 fps.
Looking at the Joules for the .43 and .48's I'd either need to drop down to a 140 spring or use 0.43 and relax the spring a little.
Looking at this thread
it doesn't look that far off from where I am