I'm about to buy my first semi-automatic weapon. After much searching, I've decided on the glock 19 gen 4. However, I'm concerned that the 19 I'd get from my local shop could have the old springs/ejectors etc. The guy is offering a new one for $549+tax (which is cheaper than bud's with transfer). However, do you think they'd get offended if I asked to open it up and look at the serial numbers on the spring and ejector? Does anyone know exactly what #'s I should be looking for? Thanks!