This Optic Ready 1911 Commander Belt Holster is the ideal holster for a Commander size 1911 with or without an optic installed. Best fitted for 1911's with no or half rails it is an attractive 1911 belt holster that fits like a glove and offers excellent retention for barrel lengths from 3.5 to 4.25 inches.One size - 4.25a ^2 firearms will fit flush.