New Colt Series 70 o1970A1CS not locking back on last round - help

My new Colt o1970A1CS is not locking back on the last round about 90% of the time.

The magazine follower is over riding the slide stop, when this occurs, the magazine does not drop free because the magazine follower is above the slide stop.

This is happening with both GI factory Colt magazines that came with the gun.

The slide locks back when just cycling the gun by hand on an empty magazine.

Any tips would be greatly appreciated.

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New Colt Series 70 o1970A1CS not locking back on last round - help