I read in GT that when you change your slide or any part of your trigger system you should also check the trigger bar (sear) with the firing pin lug engagement. I have this glock orange armorer plate and I appreciate your help in how to check/tune up my trigger to have the optimal engagement. 1. What is the optimal engagement between the trigger bar and the FP lug which gives prefect trigger performance? 2. How do I measure it and how should it look like? 3. What's the best way to tune it up? thanks in advance for your help.