"spysir"BTB, thanks for the reg checker parts links!
I still do not have any poi shift with my Qauntlet ( .177 ) , strip it down to the airtube & reassemble and it's w/in 4 clicks, lay it down any ole way and it's just fine.
If wanting to stiffen it up a bit the Qauntlet is a better design than a QB - which you needed to drill & tap holes in the receiver for extra screws- as you can remove the receiver w/out removing the barrel this design will allow bonding the barrel in place , the Bam50 was this way, same three grooves but filled with epoxy ish bonding agent. If ever needing to remove barrel from receiver just heat it up a bit and pull.
It might also be interesting to bond or attach ( using screws ) the shroud mount to the receiver. I personally see no reason to go there but it wouldnt be hard to try.
Biggest problem I've seen on mine if looking for more power would be the valve exhaust port NOT lining up with the hole in air tube and/or transfer port.
On mine the exhaust hole is partially cover by the transfer port tube. As the valve too far to the rear there is really no way to remedy this w/out a good bit of work. As I have no plans on hopping this one up it isnt an issue, and maybe mine is that way b ut most arent? ( I would love to hear from others if there TP is centered or not as if some are centered I would chance ordering a new valve).
I was planning on some 100 yards shooting with it today buit I wasnt planning on 6" of new snow, I'll post up some groups in the nest week or sao.
John