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When running an AR-15/M-16/M4 it is advisable to run 28rds in a 30rd magazine.. there are several of benefits to this:
1. Reliability - while a 30rd magazine is designed to hold 30, the maximum compression of the magazine spring can cause problems if the gun isn't up to spec (ie worn out or a POS) or running auto/suppressed.
2. Ease of reloading - seating a magazine with 30 can be a pain if the bolt happens to be forward. Failure to fully seat results in a failed reload which turns into a malfunction drill instead of a trigger pull.
3. Longevity of the magazine - loading 30rds for use/storage will eventually lead to a more rapid spread of the feedlips on aluminum magazines
Why 28 instead of 29? - loading 28 allows for an easy check for full capacity - the round is always on the right and you can depress the rounds to be even with the bolt release cutout.
THIS-1 on >15rd handgun mags or -2 on 30rd rifle mags
...because getting that last round in while reloading 40 magazines SUCKS! LOL!
When running an AR-15/M-16/M4 it is advisable to run 28rds in a 30rd magazine.. there are several of benefits to this:
1. Reliability - while a 30rd magazine is designed to hold 30, the maximum compression of the magazine spring can cause problems if the gun isn't up to spec (ie worn out or a POS) or running auto/suppressed.
2. Ease of reloading - seating a magazine with 30 can be a pain if the bolt happens to be forward. Failure to fully seat results in a failed reload which turns into a malfunction drill instead of a trigger pull.
3. Longevity of the magazine - loading 30rds for use/storage will eventually lead to a more rapid spread of the feedlips on aluminum magazines
Why 28 instead of 29? - loading 28 allows for an easy check for full capacity - the round is always on the right and you can depress the rounds to be even with the bolt release cutout.