I have oredered from Survivalops. Their ammo cycled just fine in my Serbu semi, no extraction issues or rounds stuck to the chamber. I have to admit that the last time I ordered was a little nervous. After I placed the order, received an email with a confirmation. Several days went by and wasn't getting any tracking info. I called several times and it would always go to voicemail, there were no replies to my emails either.
After waiting a few days more I was ready to call my credit card and report the operation but that day the order was delivered.
I did talk to the owner once, and he was helpful. I suspect this is a very small operation; however, their customer service could be improved. Having said that their ammo worked and looked great.