Nailed this in the end.
for anyone that lands in the same situation or is interested lol it all panned out like this:
- found the nozzle was making contact with the upper and lower surfaces of the hop.
- checked the cylinder, piston and al related compression components
all ok 🤔
- found that when the upper receiver was attached the connection was stiff
- then found the pin just above the trigger hadn’t been replaced by the original tech allowing the tv to tilt so slightly.
- replaced pin and normality resumed 😁
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