The gun in question S57E was made at a time when Beretta were using Best quality materials and I have yet to see a 55/56 or 57 show severely worn locking pin holes, however the modern S682's and their like are another matter, 2 years of heavy trap use will see the holes severely out of round and needing rebuilding, material qualities have been degraded to the point where reliability of lower end Beretta is comparable to Spanish low end. Beretta have tried to play in the low end through to high end guns and have damaged thier reputation along the way, the DT10 is a standing example of Junk at inflated prices and is evidenced by thier poor resale price. Your S57E should give you many years of reliable shooting.
hotrack