Ammo no bueno - Ammo, Inc. .300 AAC Blackout 150 Grain Full Metal Jacket (FMJ) Brass Cased Rifle Ammunition

I experience similar issues as those who posted before me. Gas position 3 on a brand new JAKL fired for the first time using brand new Lancer 20 round mags. Every round sounded weak at detonation and created a “lazy bolt” that never wanted to return to battery, resulting in almost 100% failure to feed. Switched ammo to S&B 124 grain—same rifle, same mags, and same gas position with no issues.