if you had to pick one (newbie's first PCP) to grow with...

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Dusk what is the lower rail extension? Does it allow the gun to be folded and fully activate the safety?
 
This is a good quality low cost piece by Lion Gears. Ref Edgun Leshiy Club

Since I just installed it, I didn't pay close attention to the location of the mount. I since pushed it back towards the trigger. Now it clears the stock/air tube to let it engage safety just fine.

Thanks for pointing it out. With a trigger this sensitive, it's imperative the safety engages correctly!

Cheers!