I recently sold R499 (Deerdale).
I made arangements with his FFL if the new owner did not like his new PUP, I woud refund his money less shipping home.
He took me up on the offer. His FFL had an indoor range and he able to test it out. I was told from the almost owner it would not run reliably and I purchased it back.
Today I went to the range and gave her a test. 93 rounds of Speer 115 GDs down range and not one malfunction!
I shot three magazines at a time and let her cool down in between.
After a thorough cleaning, she now resting with the other 7 rounds in my front pocket.