A spring is a spring - Strike Industries AR Pistol Flat Wire Spring

I bought into the hype of all the 5 star reviews here. Recoil, sounds, all feels the same as the stock round wire spring. I wasted my money, but at least it wasn't too much. A buffer spring is a buffer spring when used in a naturally hard kicking .45 or 10 mm PCC, at least in my experience. What's more, a flat spring is slightly harder to remove and install because it gets caught on the retainer pin.