Just saw an ATI 300 blackout 16" barrel 30 round clip for under $400.Is ATI ****,don't understand pricing.

Link to what you are looking at?

At that price, might be the polymer upper and lower.

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Peace was my Profession

Or upper only. ?????

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CSM, U S Army(Ret) 1963-1990

Don't think this was the site but found one at $399 at Gun.Deals search 300 blackout

Something like this, perhaps?
American Tactical Imports

ATI uses a polymer lower receiver that is a plastic overmould of a metal insert that reinforces where the buffer tube and rear take-down pin is located. There is no metal-on-metal contact at the take-down pin in the front.

Given the prices on competing all-metal rifles like Ruger, S&W, Bushmaster, Stoner, etc., my personal opinion is that you would probably be happier in the long run with a metal lower receiver even if costs a few dollars more.

Hdwhitt,no,these were $399,but I did go back and look and they were reinforced polymer upper and lower

Stick with metal. Whats even easier is to just buy a .300blk upper and use your existing S&W lower, easy peasy.

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Still carrying my S&W 642