CZ-USA CZ 557 243 Win/308 Win/7mm-08 Rem 4 Round Steel Black Finish - 308 Winchester/7.62 NATO Caliber, OEM Origin

ABSOLUTELY HORRIBLE!!! DO NOT BUY THESE. The packages were labeled CZ USA Kansas City. They also look identical to the magazine that came with my cz 557 .308 left hand except for the magazine floor plate - the OEM one that came with the gun had a more rounded front to the floor plate. These have more of a pointed front on their floor plate.
The issue is - the springs are entirely different from the ones that came with the rifle. These springs in these replacement magazines have more coils and its also a heavier spring which puts a lot more upward pressure on the magazine follower. The gun cycles very rough and the pushfeed does not work like it should (malfunctions and jams up your action - plus it destroys your brass). I'll call CZ and see if I can order the OEM parts that come with the 557.
The OEM magazine that comes with the rifle feeds flawlessly and smoothly.