I just got my sigma 40 cal. I did a field strip, put it back together, noticed that the rear slide and the plastic grooves (in rear) have a gap of about 1/4" when assembled. I really did'nt notice before that the gaps are there. I't funtions normally so I'm sure I put it back right. Please advise. A picture of the rear of the gun would help. I just want to make sure I did'nt break something. Thanks