 For a 2011 pattern handgun, aftermarket parts and magazine can give a magazine capacity of 29 rounds (reloadable) of 9x19 mm for a 171.25 mm USPSA Open magazine (28 rounds for a shorter 170 mm IPSC Open magazine), or up to 26 rounds of .40 S&W for a 171.25 mm USPSA Open magazine, although the .40 S&W caliber is less commonly used in Open.Most modifications are permitted in Limited division except optical sights or compensators.Although most handguns can be used for Limited, some popular choices are the high capacity 2011 frame STI and SVI pistols.