Spring issues - Tyrant CNC Sig Sauer P365 X-Macro +3 Magazine Extension

The quality of the mag extension itself is pretty great, but the spring not so much. I’m not sure if I received 2 defective springs or they weren’t designed to have enough force to hold the slide open after firing the last round. Based on the reviews it looks like it’s either hit or miss. Either way I would say proceed at your own risk.