I prfer the mk II's over the III's & really like my slab side mkII. They are a pia to clean & reassemble but my 1st pistol was a mk II target std 51/2 barrel, would shoot a brick a week through it for the 1st few months, has about 20,000 rds throught it. Comes appart easy & goes together easy just need to break them in. Have the buckmark & p22 like my rugers just shoot the tar out of them the lock piece will lossen up