That ping noise is like when you take a hammer and hit the valve and it does not move as much. For example: take a hammer and hit a solid metal that wont move, a very high pitch noise will be made. If you take a bigger hammer and hit it more the ping goes away. For example take a bigger...
Fx 15.9 grn pellets: 5 full tins, + 1/2 tin JTS semi dome 21.53gr 3 full tins, + 1/2 tin JTS domed 22.07 grn 3 full tins, + 1/2 tin Jsb 25grn redesign 8 full tins, + 1/2 tin $150 for everything obo shipped. PP F&F
FX Hybrid slugs 22 cal. 22grn. .217 diameter 17 full sleeves and 1 almost full. Jsb Knockout 22cal. 25grn. .217 diameter 5 full tins All for $165 shipped. Pay Pal, F&F