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This extension tube came with a spring and a bright green follower. It was a very fast job to install it. The only hiccup I had was when I removed the original threaded cap I was unsure of how to remove the inner cap that held the spring in place. After YouTubing for a bit, I just used some needle nose pliers to wiggle that part out and I was off to the races. Apparently newer 870's have bumps on the inside of the mag tube that keep the spring in place which must be flattened (dremmeled or filed) to remove the spring. Once I know what I was doing my second shotgun took 60 seconds from start to finish to complete this job.
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