All, I was out shooting the USP40C today and I put about 125 rounds through it. I only used Federal & PMC 180 FMJ rounds, no reloads or Wolf at all. When I got home to clean it I noticed a slight split of the plastic on the LT hand side near the trigger that I circled in red in the attached photo. Has anybody else ran into this? Is it normal? Should I contact HK or a local shop to review. I am not the original owner but the gun is from 2006. Thanks!