I have been searching this site and I'm sure that the JP is the way to go. They have an excellent reputation on this site and I've never heard a negative comment. I'm just not sure how I should go about it?
My current rifle is and has been very reliable.
The accuracy is good enough for the local match (which only goes to 50 yards), but what about bigger matches. I've never been and have only fired my rifle only up to 300 yards with irons. Accuracy was nothing to brag about (10 shots in about a 12 inch group, best I can remember).
To answer the third question, I believe that I would benefit from all the features of a JP. Since transitions and splits would be minimized with those features.
No brake, just the A2 flash suppressor.
And I haven't cursed my current rifle. It has done everything I've asked thus far. I'm just planning for the next big match.
Lastly, what do I gain from a JP lower? It seems all the important stuff is in the upper.