It's worth noting that the Marlin Model 9's magazine may be replaced with standard S&W Model 59 double-stack handgun magazines. A 7-round M1911-style single stack was employed in the Model 45. Marlin dropped the optional 20-round magazine in 1990 and began delivering the Model 9 with a four-shot magazine until settling on a 10-round mag in 1995. The last Marlin Model 9 sold in 2004 had only four rounds in its magazine. There are also aftermarket magazines available for the Model 9. These include: Magpul PMAG, Zastava MZP, and CZ-USA P10D.