Swapping parts

[fflmike]

Okay, I have an issue.  I have a regular black P-07 that I put the CGW pro kit into.  Works great!.  I just traded for another P-07 UG with the threaded barrel and high night sights.  I decided to take the pro kit parts out of the black one and put them into the gray one.  When I finished, the gray one would not trip the hammer in single action but would in double action, so I put them all back like they were.  I decided that I must have done something wrong so I went through the same process again.  Same issue, would not trip the hammer in single action.  So I put them back like they were again.  I only swapped the parts from the kit.  The second time I did not swap the parts in the slide though.  Can't figure out what is going on.  I am planning on putting the pro kit in both but will I have the same issue? 

[fflmike]

I did not swap the trigger return spring, but don't think that is the issue.  I'm kind of afraid to purchase the Pro kit for this one till I know it will work.

[CraZy81]

More than likely, you have to file the polymer behind the trigger to allow more space for the hammer to drop in s/a. Not enough space behind the trigger.

[fflmike]

More than likely, you have to file the polymer behind the trigger to allow more space for the hammer to drop in s/a. Not enough space behind the trigger.

That was it.  Thanks for the help

[Grendel]

Please do not double post. Thank you.