I haven’t touched the atlas works bottom metal, however I got the bottom for my tikka from greyboe rifles. I like it a lot already and I chose it because it has a “barricade stop” on front so I don’t push on the mags. I would recommend it so far.
I have one in my 223 tikka and it works just fine. I had to file a little off the magazine latch but it has been 100% reliable so far. Wouldn't hesitate to recommend one.