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Old August 23, 2012, 09:49 AM   #1
MWB1982
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Can someone help me out? Tell me what is wrong with my M4?

I hope this is the correct place in the forums to ask.

I have a brand new M4. I put about 500 rounds through it and I cleaned it.

Now I'm experiencing some technical difficulties.

When I pull the charging handle back with a magazine in, the bolt won't go forward. When I take the magazine out, it functions the way it is supposed to. I can see what is stopping the bolt from going forward but don't know how to fix it.

This was my first attempt at cleaning an AR in over 10 years. I thought I did a good job until I discovered this problem.

Does anyone know what is going on with my rifle?
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Old August 23, 2012, 10:01 AM   #2
Bartholomew Roberts
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Is the magazine empty? If so, the rifle is functioning properly. The magazine follower engages the bolt catch and locks the bolt back. Pushing the little paddle on the left side of the rifle will release the bolt.

If you are experiencing this with rounds loaded in the magazine, then the problem is likely either your magazine follower or your bolt catch.
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Old August 23, 2012, 10:08 AM   #3
booker_t
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MWB, I suggest you read the manual. Maybe find somebody local who can give you an OV-1 of the M16/M4/AR-15 platform and it's operating principles.

As BR said, an empty magazine will push the bolt catch up, holding the bolt carrier group back after the last round is fired or over any empty magazine. This is proper function. The bolt can be released into battery then by depressing the bolt catch paddle on the left side of the lower receiver.
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Old August 23, 2012, 10:18 AM   #4
MWB1982
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Well damn, maybe I fixed it when I cleaned it because I'm pretty positive I had it sliding forward before I cleaned it. Or maybe I didn't lol.

I have looked into AR classes, just the guys who run these classes don't have any planned anytime soon. These are the guys at Guns Plus who also have that show on TRU TV called Combat Pawn. Like I said, it's been about 10 years or so since I've been in the military. I've forgotten a lot but a lot came back to me when I disassembled my rifle.

Thanks a lot and I will take that advice.
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Old August 23, 2012, 11:43 AM   #5
booker_t
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Right on. YouTube is also a great resource for how-to, just confirm what people say because there is a lot of bad info on there as well. Happy shooting & be safe.

And welcome to the forum!
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Old August 23, 2012, 12:35 PM   #6
JeffSSig
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What brand is the lower?

With the mag out and bolt closed do you notice extra side to side play or slop in the bolt catch?
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Old August 23, 2012, 06:22 PM   #7
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I was going to post an incredibly snide remark but chose to be a better man and didn't.
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Old August 23, 2012, 06:54 PM   #8
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FWIW, the Combat Pawn guys look like a bunch of jackasses. And unsafe ones at that. Sweeping a busy street with supposedly loaded guns while making sure there are no terrorists waiting to ambush them while opening the store up for the day.

I rolled my eyes so hard I got a detached retina.
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Old August 24, 2012, 06:40 AM   #9
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I rolled my eyes so hard I got a detached retina.
Ruined another keyboard with coffee.
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Old August 24, 2012, 08:09 AM   #10
booker_t
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TruTV is anything but. It's WWF meets "reality" television.
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Old August 25, 2012, 11:20 PM   #11
allaroundhunter
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Quote:
When I pull the charging handle back with a magazine in, the bolt won't go forward. When I take the magazine out, it functions the way it is supposed to. I can see what is stopping the bolt from going forward but don't know how to fix it.
That would be the bolt catch working properly, just as one would on a semi-automatic handgun. When the magazine runs dry and the action cycles, it holds the bolt open so that you know you are out of ammunition.

I agree with poster #2....the manual would be a great place to start.
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Old August 26, 2012, 08:57 AM   #12
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When i first read this post I thought this was a joke....., but then I remembered a guy I ran into at the range a few weeks ago that had his scope mounted backwards and was wondering why the objects looked further away (true story I swear I am not making it up)
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Old August 26, 2012, 08:58 AM   #13
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You sir, have a defected weapon it is unsafe and unrepairable. I own a company is Las Vegas called "GunHo weapons disposal services" which provides the service of removing unsafe/unrepairable weapons off the hands of gun owner across the US. Safety to all gun owner is our main concern.

Please PM me for my address


P.S. Please forward all ammo for the defected weapon so we can also dispose it properly.

Last edited by 1DrnkMxR; August 26, 2012 at 09:16 AM.
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Old August 26, 2012, 02:47 PM   #14
moxie
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Weapons don't defect, people do. As in the spy defected to the West. Now weapons can be defective. In which case your disposal scheme would make more sense. Mix up another, buddy.
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Old August 26, 2012, 02:52 PM   #15
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I remembered a guy I ran into at the range a few weeks ago that had his scope mounted backwards and was wondering why the objects looked further away
You sure you're not making that up?

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Old August 26, 2012, 04:57 PM   #16
Palmetto-Pride
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You sure you're not making that up?
Here's my post on it.....http://thefiringline.com/forums/showthread.php?t=463853

Ok so it wasn't a few weeks ago, wow didn't realize its been almost a year ago....
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Old August 26, 2012, 05:37 PM   #17
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Here's my post on it...
Amazin'! Just freakin' amazin'.

About 20 years ago, I had a guy shoot me in the leg at a rifle range in AZ... but that's an amazin' story for another time.

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Old August 26, 2012, 06:04 PM   #18
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Could the magazine button be a little loose and the lock is not engaging the magazine properly?
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