Gamo Lead shavings

I recently bought a gamo swarm gen 3 .22 caliber, after breaking the barrel, I noticed a thin shaving of lead fell and hit my leg after I shot, this seems to happen every 10 shots or so, I'm not real experienced with air guns so I'm not sure what's going on, I just shot 30 pellets and I found about five shavings one was in the front of my scope? Can anybody help me?
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