src sr92 advice

[Dude666fx]

Hi everyone, has anyone owned one of the src m9 gas blowbacks?

They look tm/kj/we/hfc compatible but are they?

What are they like reliability, gas usage, co2 usable?

They mention that they have adjustable hop up is this true?

Found some on offer for a good price and wanted an m9 for a while now, there isn't much on Google or YouTube about them what is on there is all positive yet I feel I need a little more reassurance maybe there's a reason there on offer.

I thank you in advance for your time.