Range dudes are notorious for their mouths moving faster than their brains can function.
Break in varies from run out of the box up to sometimes more than the 200 they recommend.
It may not even be a break in issue, might be under powered ammo or a faulty spring or extractor. Could be anything.
Sort of chaffes my backside when so called experts just generally bad mouth a brand or group of brands such as this case. They have little actual knowledge so they figure it must be junk.
Keep shooting, use good quality practice ammo and get back to us.
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."