Started both my kids with slingshots around 6 or so. Then bow and arrows around 8 and air guns around 9 or 10. Both very smart and muture by then. They had to be able to hit bottom of soda can 5 time in a row constantly with iron sights before I scoped it.
I ordered cs 2mm x id 6mm Orings. Greased them up and installed. I filled up 3 guns in a row problem seems to have been solved. Again, thanks for all the help.
I pulled my tank out and used the pump and the tank hose to fill to 4500 yesterday. So, the problem has to be in the other fill hose with those O-rings. I ordered new and will replace. I do appreciate everyone's time and help! Thank you