Hello Brad, we are almost neighbors!
Yes, with the assorted Luger books, you can figure out which type of magazines go with each gun.
Can you tell us any markings on the gun?
Proofs? (see on your left under tech information if you came through
www.lugerforum.com) Tell us what and where proofs and markings are located.
There are forms in this section, where you can print out and then write down pertinent information.
What serial number is on the gun? To include any letters next to or under the serial number?
What year or letters are stamped on the top of the receiver?
What initials or letters are on the toggle?
Can you provide pictures, to include side, top, etc?
All of that can help really ID your new gun.
Do you consider it a 1920 because of its 1920 markings or???