My 617-6 was only firing 6 out of 10. used different ammo and it did not change, although CCI mini mags were the the best so far. Sent it back to S&W and it cam back rather quickly. Went to the range and after 100 rounds, back to only 2 rounds not firing. Sent it back a second time and came back within 3 weeks, finally hitting on all 10 rounds. Now my problem is that the revolver shoots very high and I cant adjust that back sight. Sent it back today, hope they fix it soon.