I have read where 41 byf's should have the P-08 stamped on the receiver, left side. Does this always hold true? I have 41 BYF 963 with no suffix, E/135 marked, and have also read that #1000 was the start of that production. There is no P-08 stamped on the receiver. The mags are police syle numbered 1 and 2 with nothing else but 963 on them. The gun has no sear safety, and has not been drilled for one. Came as a rig with capture papers. Any help much appreciated.