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As suggested above, either remove the upper or lock the bolt back and try the mags that will not lock in.
Also try a few empty mags. Are you loading the mags to 28 rounds or putting in as many as you can fit? Standard metal mags should be loaded to 28 even though they are marketed as 30. Anything over 28 and the pressure from the spring on the bullets can make it hard to seat the mag with the bolt carrier assembly in the closed position. If the cheaper mag is working with 30, it's probably due to a weaker spring. The Pmags can be loaded to 30 and still lock in without problems, but, like the metal mags, you can fit more than 30 in them if you try hard enough, so make sure you count the rounds out. If the mags will not lock in after the above discussion is covered, take a look at your magazine release button on the ejection port side of the gun. you should see that there is a threaded bolt coming through the button. Are the threads flush with the button face or recessed? If recessed, push the button in with an ink pen so that the mag catch sticks out past the side of the lower on the non-ejection port side of the lower. While keeping the button pressed in with the pen, rotate the mag catch around so that the threaded bolt screws into the button an extra turn or two, until it is flush with the face of the button. Make sure you are pressing the button in far enough that you don't rub your lower receiver with the mag catch as it will scratch the lower all up. Post your results please. Wes |
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What do you use to load your mags?
I use a toggle LULA and when it hits 30 rounds. The LULA will just pop off if I try to toggle it for an extra round. Your mags if an even number of round capacity should end with the last round being on the right (bullets pointing forward). |
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