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Old 05-17-2017, 11:27 AM   #1
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sunny08 .22
AR ISSUE

Went shooting the other day with a friend who has a bushmaster M4/A3. The rifle shoots well, but he was having a problem. The bolt wouldn't lock open upon the last round fired. We tried a couple of different mags with the same issue. We gave it a quick field strip and cleaning. Same problem. Before he takes it to a gunsmith or sends it back, I told him about the Walther forum to see if I could get any feed back. Thanks.
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Old 05-17-2017, 11:30 AM   #2
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Kar98 .22
Probably a better forum would be ar15.com
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Old 05-17-2017, 11:38 AM   #3
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sunny08 .22
I'm trying opinions from a couple of different forums. But thanks.
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Old 05-17-2017, 12:32 PM   #4
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MGMike .38
If you want suggestions on what might be the cause, some facts ordinarily are helpful.

For example: a) Does an empty magazine lock the bolt open if operated manually? b) What kind of ammunition is being used? c) What kind of magazines are being used?

M

P.S. I just came back this morning from my doctor's. I told her, "Doc, I don't feel so well. What do you think is wrong?" She says, "Maybe you're sitting on a thumbtack."
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Old 05-17-2017, 03:18 PM   #5
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halfmoonclip .22
This ^^^^^, (the thumbtack part excepted)and you might try 'breaking' the upper, and see if an empty magazine is indeed lifting the boltstop.
Bushies aren't bad ARs; is this one much used, and entirely stock?
Moon
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Old 05-17-2017, 03:36 PM   #6
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ErichBaumer .22
Second on separating the upper and lower and seeing if the mag follower pushes the bolt catch up all the way. I had the same problem with my AR 556 and found that the catch was either slightly bent or just sticking, either way it didn't move freely enough. It worked after lubricating and breaking it in.
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Old 05-17-2017, 07:22 PM   #7
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What sort of buffer and spring are in it? Did you change it out for heavier types? Is your gas block on tight? Is the carrier key loose? These are further areas that might impact function. Could be under powered ammo too.
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Old 05-18-2017, 06:19 PM   #8
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sunny08 .22
I really appreciate the input. Here's what we did. First, a good cleaning. And check all working parts gas tube, buffer spring etc. The day of shooting, we had six 30 round mags loaded. We checked the mags empty in the rifle. The bolt wouldn't stay open on two of the mags. Marked with tape. Back to the range. As I found out at the range which I didn't pay attention to on the first day, my friend had the mags loaded with some 20 year old plus 223. So we loaded the six mags with five rounds each of the same ammo. Same result with all the mags. So we loaded some fairly new 556. Bolt stayed open on four mags, the two marked with tape didn't. So your guess is as good as mine. Old under powered 223 ammo which is a first for me. Or something else. We kept shooting the four mags with 556 and no problems. Appears problem corrected.
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Old 05-19-2017, 12:13 AM   #9
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halfmoonclip .22
Old ammo isn't necessarily a problem, assuming decent storage. What was the provenance of the old ammo? NATO standard or something less?
On the two mags that wouldn't engage the bolt stop, could you see what the issue was? Were the mags USGI?
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Old 05-19-2017, 05:42 PM   #10
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sunny08 .22
Quote:
Originally Posted by halfmoonclip View Post
Old ammo isn't necessarily a problem, assuming decent storage. What was the provenance of the old ammo? NATO standard or something less?
On the two mags that wouldn't engage the bolt stop, could you see what the issue was? Were the mags USGI?
Moon
Halfmoon. The ammo was 20 plus years or older. Stored in an outside shed. It wasn't NATO. Just standard 55 grain 223. The mags were in rough shape. Unknown if they were USGI. I've shot very old ammo before. 1st time it might be a contributing factor. We are going back to the range next week. I'm going to try the ammo in one of my AR's and see what happens.
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