All of the above. Find a Pawn Shop that deals with firearms. Present the gun in the configuration you want. Tell the Pawn folks, (They really don’t care.) “I just need some cash for a short term. How much can I get and what will it cost?” Check on the earliest date you can satisfy (repay) the loan. Agree and fill out the loan paper and submit the gun. Two days (?) later repay the loan and the fees (“I got a raise, so I’m good.”) then pay for the gun to be DROS’ed to you in its current form. Wait 10 periods of 24-hours, and pick up your gun.
If you’re near West Covina,
Aces Pawn is familiar with the process.