To weigh in on the 16 vs. 18 question -
I have a 16” JP-15 and an 18” JP CTR-02. Both rifles shoot better than me. For accuracy, it would be hard to find a better barrel than the JP supermatch barrels.
Personally, I prefer the 18” gun. Both can easily handle the occasional 500 yard shots we see locally here in the PA/WV/VA/OH area. I just like a little heavier gun, it might help mitigate recoil a little better, it might be mental, but it works for me.
JP code: 68SS0717 will save you 5% on complete JP rifles and 10% on JP parts