Any Feedback on JSE Surplus Bbls

[Burtj]

I ordered the complete 20" custom upper. I have yet to shoot it but I've talked to guys who claim to be getting .75 groups at 100 yards with quality ammo. Also, any of their uppers that don't state that they are either Wilson or oden barrels are mossberg. I hear mossberg is also making the barrels for the wolf 6.5 Grendel uppers.