I also experienced all of those issues except the stiff thumb safety:
https://pistol-forum.com/showthread....cs-Ready-45ACP
The lock-back issues went away after the first 100 rounds or so and a field strip cleaning.
I like my rifles like my women - short, light, fast, brown, and suppressed.
Double tap
I like my rifles like my women - short, light, fast, brown, and suppressed.