I'll admit this has limited applicability but it is VERY handy for shooting events/sports where you are having to load mags to different round counts throughout the day. Helps determine very quickly if your partially loaded mag is a "full" 10 rounds as required by the course description or if it is a partially full from the previous stage.
I also used it to "calibrate" my window mags that have round counters on the sides. at least 2 had the orange mark on the spring pointing to either above or below a round count so I never knew if it was 1 more or 1 too many.
Materials: White zip tie, fine point sharpie, knife/side cuts to cut the tip to square.
Design principals: The more informed may correct my logic because this is based on my observation of the different types of mags I have. AR mags seem to have as part of their design the same horizontal line on the back (noted with the yellow dotted line.) Using this as the reference line works much better than using some reference point on the round itself and I noticed the depth of the curvature is not the same from one mag to another. I marked the zip tie on both sides. I made sure to mark in the depth of the groove on the side with the groves and lands hoping that will protect the mark from getting wiped away over time. I had to write "5,10,15,20.." on the smooth side of the zip tie so we'll see how it holds up without the grooves protecting it from being rubbed away over time.
I may get creative and make smaller hash lines for each round. (?)
Everything else seems self explanatory.
I also used it to "calibrate" my window mags that have round counters on the sides. at least 2 had the orange mark on the spring pointing to either above or below a round count so I never knew if it was 1 more or 1 too many.
Materials: White zip tie, fine point sharpie, knife/side cuts to cut the tip to square.
Design principals: The more informed may correct my logic because this is based on my observation of the different types of mags I have. AR mags seem to have as part of their design the same horizontal line on the back (noted with the yellow dotted line.) Using this as the reference line works much better than using some reference point on the round itself and I noticed the depth of the curvature is not the same from one mag to another. I marked the zip tie on both sides. I made sure to mark in the depth of the groove on the side with the groves and lands hoping that will protect the mark from getting wiped away over time. I had to write "5,10,15,20.." on the smooth side of the zip tie so we'll see how it holds up without the grooves protecting it from being rubbed away over time.
I may get creative and make smaller hash lines for each round. (?)
Everything else seems self explanatory.
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