AR magazine ?

That is a serious problem. Is the mag button stuck? You should be able to look up into the mag well and make sure the mag button protrudes into the mag wll to catch the magazine. I don't have my AR in front of me now so maybe someone else can chime in and help.
 
Are the mags that are falling out empty? Sometimes if you try to put a fully loaded magazine into a gun with the bolt in the forward position, the magazine doesn't catch on the latch completely. That could cause it to fall out.
 
Try loading 2 less rounds in the magazine. For what it is worth, I can load Magpul PMags to capacity, and they stay latched in the gun, but if I use standard mags (even good ones like Brownells), I have to load them down.
 
I've noticed this on my one Bushmaster. It won't feed a mag when the bolt is closed already making tactical reloads non-existant.

Bolt has to be open in order to feed a mag, even with Bushmaster magazines.
 
When you put the magazine in give it a good smack on the bottom of the mag. Make sure it is fully seated. Do you have any other magazines? Have you tried this with other magazines. If the mags are fully seated and this is happeneing with all mags I would have to assume you have a issue with your mag release button. Maybe with the magazine out of the weapon push the mag release button in firmly. Maybe it's just bent and needs to be bent back. I don't know I'm just ramblin now. You could take the upper off the weapon. Place a magazine into the weapon and look down into the magwell from the top. You might be able to see why it's not catching.
 
It won't feed a mag when the bolt is closed already making tactical reloads non-existant.

Bolt has to be open in order to feed a mag, even with Bushmaster magazines.
Click to expand...

That is not good. I have never heard of that from an AR. You should be able to seat a fully loaded mag into an AR regardless of wether the bolt is forward or not.
 
Thanks everyone for help. This was happening before pulling charging handle, but it still seems the loaded mag shouldn't fall out easily with a shake before pulling charging handle.
 
Does this happen with all mag types? Try an alum GI mag. They aren't as tacticool as the polymer Magpul's but they are cheap, plentiful, and functional.
 
Test it with another brand of magazine. Also wen you put the mag in give it a good upward whack to ensure that it is in fact seated.
 
Definitely not fully seating the mag. I'm new to AR-15s and this happened to me too. If you insert the mag with the bolt forward, make sure to give it a good slap on the bottom and see if you can pull the mag out. With the bolt back it should be no problem.
 
It's possible the mag catch is not screwed together completely or is bent. When looking at the mag catch button is the mag catch screw threaded fully into the button? If a thread or two is visible in the button, you may need to turn it another round. I want my assemblies to just clear the mag when the button is pushed fully into the lower.
 
Good call mobuck, I had forgotten that little nugget of wisdom. Just because a gun is new, high speed, or both doesn't mean it's exact to assembly specs.
 
It won't feed a mag when the bolt is closed already making tactical reloads non-existant.

Bolt has to be open in order to feed a mag, even with Bushmaster magazines.
Click to expand...
That is not good. I have never heard of that from an AR. You should be able to seat a fully loaded mag into an AR regardless of wether the bolt is forward or not.
Click to expand...

I couldn't remember how mine behaves so I just had a look see. Colt lower with Colt "AR-15" branded aluminum mags: bolt open or closed, a full mag snaps into place, with light pressure, no need to give it a slap.

If the mag will latch-up properly when not fully topped off that tells you the mag release is functioning properly. If a full mag will latch-up properly only with the bolt retracted it tells us something else -- the mag is over capacity and here's why: When you insert a mag with the bolt open, the top round sits proud, ready to be stripped on its way to the chamber. When you insert the mag with the bolt closed, the top round can't sit proud (the bolt is in the way) so it's forced to retreat into the mag until the bolt is reciprocated. If the mag is so full that there isn't room for the top round to retreat, then the mag can't be inserted deep enough to properly engage the release's latch -- a little shake might be enough to release it. By slapping the mag you're forcing the top round down to allow the latch to catch; but, you're also forcing the bolt upward.

Just because a mag has a published capacity doesn't mean it's happy at that capacity. If your mag works smoothly with a round, or two, under capacity live with it -- don't force the situation. Back in the day, when the 20-round mag was common, here's what came with the M16 pocket reference card handed-out in Vietnam:
The M16 is the finest military rifle ever made…
b. Inspect your ammo when you load the magazines. Don't load dented or dirty ammo. Remember, load only 18 or 19 rounds.

On the other hand, if a partially full mag self releases when you give your AR a shake, then your problems are more than just an overfilled mag. Could be the mags, could be the gun, or could be both.
 
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