What is the value of a 20 gauge bps 16253mz121 and how old is the gun?

The value of a 20 gauge BPS 16253MZ121 can vary based on its condition, location, and market demand, typically ranging from $400 to $700. As for the age of the gun, the BPS series was first introduced in the late 1970s, so this specific model is likely to be several decades old, depending on its manufacturing date. To determine the exact age, you would need to check the serial number against the manufacturer's records.