My 2p worth since I've just finished my bar 10/ Mancraft build...
When I first got the rifle, it looked well made out the box the seat was sticking but sorted that with a file, was shooting 380-400 fps and max range was 150' with .28's as it wouldn't lift any heavier
The build..
Start at the front, orga 6.23, r-hopped, modded bucking for r hop, hop arm modded with much longer nub, standard hop unit. Then Mancraft kit using standard trigger as the spring in the HPA unit is way lighter than standard and it actually sets up well.
Set it at 500 fps .20
Ive hopped it so with a tiny amount of hop it'll lift .40's so it'll lift much more without over hopping.
I be been getting very good tesults up to s lazered 235' had maybe 300 rounds through it now and just been out in absolute nil wind set up a white for sale sign 600mm square lit well and pushed it to 315' with 7 out of 10 hits
In short. Vsr/bar 10 with Mancraft and the right parts is possibly the very best set up one can build.
I did everything myself and it still wasn't cheap, so add labour and it's starting to get pricy.
But at the end of the day you pay for what you get.