Prometheus MS90 Spring for TM NGRS

This is a high-quality Prometheus Next-Gen Spring made in Japan. These springs are generally favored by Airsoft Mechanics as they can handle a significant amount of stress without breaking. Another benefit is that these springs have no coating that can easily rub off inside the gearbox. Please note that the final AEG power output is dependent on a ton of factors, and as such Brill Armory cannot guarantee a certain FPS. Some factors include compression, inner barrel length, cylinder type, inner barrel diameter, BB's used, bucking/hop-up parts used, and tappet timing.