Suggested loads for the white hot buffer spring (red and white spring):
12.25″ Barrel: 1 1/4 oz. loads, 1350 fps
18.5″ Barrel: 1 1/8 oz. lodas, 1250 fps
The general rule for selecting a buffer spring is to use the heaviest spring that will reliably function with the load you are shooting.
Please read the Shipping, Returns, and Warranty Policy prior to placing your order.