Wolf springs are said to be on the stronger than spec side of specifications. While this may seem good, that can accelerate wear of parts. In the case of a recoil spring, it is said to cause some failure to eject and feed. I try to stick to USGI when possible.

Not knowing the quality of the Korean mag springs is what lead me to conduct the test in the first place. I was expecting them to fail because they seem so thin and the metal seemed soft to the touch.