However, … Enter your serial number to the right to see if your P320 has already been upgraded. How many shots does p226 gun have per round? Mac host program for au plug in. The serial number will be stamped into the receiver. Forums General Forums 556R Discussion Forums. If you have a 27B, at least you know yours was manufactured post-recall (the mandatory safety recall to fix them from firing when you take the safety off). Proof marks are stamps embedded in certain parts of a firearm following (and sometimes during, depending on the firearm type) its manufacturing to indicate that the firearm has been “proven” to be able to handle the specific type of ammunition for which it was designed. Your P320 serial number can be found by looking on the right side of the pistol grip.
