OK, i've just purchased my P99 Wed. and took it to the range the next day...I really really like the gun, but i've noticed that it already shows signs of wear on the slide after only getting about 150 rounds...is it just me, or is this Tennifer finish not as durable as what people say? there's some wear on the right side of the slide, right at the edge of the chamber and above the extractor...is this normal or just an isolated incidence?