is this for the 2k9 micromag or a clone micromag?? those are the only ones that use the ball detent. the 2k9 uses cocker detents, but has to be a low profile detent to let the breach rotate. the clones are also cocker detents.
If you need the lever kind found on all older PTP guns then PM me cause I have a spare. Also PTP is basically out of business. The owner, Forest, has also been having some health issues so you won't be able to get ahold of him for awhile.