fwiw, the first time I went out with the JP springs a few weeks ago.. I had no issues. This weekend I shot CCI AR Tactical, Fed Bulk 36gn and 40gn, and Fed Automatch.. However I was getting light hammer strikes kinda randomly. The only difference was it was very cold this time around (I was seeing snow flakes). It wasn't the ammo since I saved all of them (5-6 rounds) and shot them out of my bolt gun just fine. I am going to try and use my factory hammer spring and try again this weekend.