Challenger pro butt stock?

I have been shooting my new used AEA challenger pro for a couple weeks (Thanks Bill).
My biggest gripe is the loose folding stock latch and the butt stock what has any of you done to improve on the stock set up?
This rifle with the regulator set at about 140 is getting over 80 shots before it starts to come off the reg.
I'm still trying to find the best pellet combo but so far H&N 18.52 baracuda hunter Extreme and jsb exact jumbo monster diabolo seems best, however the generic Crossman premiere14.3 shows good groups as well. I don't have a chronograph yet but I am shooting 30 yards from a bench.
I have ordered a Arken epl4 6x24x50 but for now I have a Mueller Eradicator 8.5 x25x50 on it. I don't care too much for this scope but it works until my Arken shows up.
 
I took one or 2(can't remember) pieces of 2 sided carpet tape from Harbor Freight and cut it to fit the joint where it folds and it stayed nice and tight. Works good if you never fold it. I do that on several folders I have. Also worked good between the bottle and barrel on a couple of guns I don't have barrel clamps on to keep the barrel in the same position so my POI doesn't change evey time.
 
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