Chip McCormick Custom 17150 1911 45 ACP 10 rd Silver Finish The Power Mags are lean and sleek yet extra-heavy-duty with increased reliability and service life. Its unique all steel follower design yields the lowest possible bearing surface for longer lasting function in dirty environments, when ongoing cleaning and maintenance may not be possible. This magazine features a unique follower design, which also functions as a spring, that allows the Rocket wire spring coils to be the largest.