Do any of ya'll have experience doing trigger work on Ruger GP100s? If so, could you talk me through the correction of a problem. I bought a used GP100 that has a "hard catch" in the trigger about 1/8 of an inch into the DA trigger pull. After that "catch" the trigger travels normally and things are fine. I have been told by someone (don't remember who) that the hammer was "posting" and that some part of the hammer needed a little filing or polishing. Can anyone help? If so, I will give any further details you need. Thanks.