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  #1  
Old 01-05-2017, 06:19 PM
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Question about misfire


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Hey guys,

So i recently got my CWP and have been carrying my fathers almost 40 year old amt 380 backup (yes I am aware that many people don't care for these and consider them junk, but its better than nothing while I save up for either a Kahr cm9 or ruger lc9s pro). I went to the range the other day and shot 100 rounds of 95 grain Remington UMC FMJ ammo. Out of those 100 rounds, I had 22 misfires where I squeezed the trigger and heard a click but nothing happened. When I ejected the round, the firing pin hit the primer though. This is strange because I normally carry Hornady 90 grain ftx critical defense ammo, and have shot over 50 rounds of it with no problems what so ever. Im guessing that the firing pin is not hitting the primer hard enough, so I guess that means that the remington ammo isnt as sensitive as the hornady ammo. However, this obviously still worries me, so im thinking that I might need to replace some parts. Could you guys give me some advice on what exactly I would need to replace? The firing pin looks to be in decent shape from what I can tell, so may initial thought is that I need to replace one of the springs as those can wear out over time. I see three different types of replacement springs on brownells.com for the amt 380, so Im wondering, would it be the firing pin spring, firing pin lock spring, or hammer spring that needs to be replaced? Or is it something else entirely? Thanks for any help.
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  #2  
Old 01-05-2017, 06:57 PM
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If it were me, rather than mess around trying to get that gun running right, I'd go pick up an inexpensive reliable self defense gun.

Right off the top of my head is the SCCY. It's a really great little gun and they can be had for a little over $200. We have multiple CPX 1's and 2's in our family and none of them have ever mis-fired or in any manner failed. And they have a no questions asked no hassle life time guarantee.

Just my .02

SMOA
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  #3  
Old 01-06-2017, 03:31 AM
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Well, if it's 40 years old, I think I would just replace all three springs. Make sure to get any crud or fouling out of it at the same time.

Also, I have in the past had problems with reliability using Remington UMC ammo in a 45, so it might just be the ammo.
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  #4  
Old 01-06-2017, 04:59 AM
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I'd tend to agree with not putting a nickel into a 40yr old unreliable CC piece. The SCCY has shown to be a reliable piece in every article I've read on it.

That said, I'd also buy some more of the ammo that had proven reliable in the past and see if it still fires reliably. If so, I'd keep it stoked with those rounds and maintain it as a back-up, kept in auto or home.
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  #5  
Old 01-06-2017, 05:27 AM
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Many folks agree any self defense fire-arm is better than none, when regarding, caliber, or revolver -vs- semi-auto.

However, whatever you decide to carry MUST operate reliably and safely. If this pistol doesn't at least operate correctly, leave it at the house. It sounds like a weak striking firing pin may be the problem, but no guarantee about that. You can try replacing springs etc., but if you have to pay for GS labor, you might as well buy new.

https://www.schludershots.com/gun-pa...gun-parts.html

There are economical choices to buy new that won't break the bank.
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Last edited by 60DRB; 01-06-2017 at 05:36 AM.
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  #6  
Old 01-06-2017, 06:31 AM
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Defensive firearm needs to work every time. Just like a fire extinguisher. You need to do what ever it takes to get there. Talk to a smithy. Maybe even buy something from him? Anything else, and you are driving around with a spare tire that has no air. Why carry that?

Cheezywan
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  #7  
Old 01-06-2017, 07:48 AM
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The worst thing you can hear, when involved with an assailant, is a "click" when you squeeze the trigger. Likely your assailant will not allow you a second chance to shoot, and your "click" will be the last thing you will ever hear.
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  #8  
Old 01-06-2017, 12:43 PM
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Thanks for the replies guys. I just figured that replacing the springs would be a good way to buy time and save up a little more money so I can buy something of better quality. I have thought about the SCCY CPX2 and have generally heard positive things about them, but if Im correct it is a double stack and I prefer pocket carry so Im a little worried about not being able to fit it in my front pocket very well. That is why I have been looking at the Kahr cm9 and Ruger LC9s pro, as they are slimmer. They also seem to be reliable and there is one of each for sale by me with approximately 100 rounds through them, both selling for $300.
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  #9  
Old 01-06-2017, 01:19 PM
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Understand the money. Talk to a smithy first. Not a knucklehead like me. A genuine gun-smithy! You might not be so far away from a defense tool as you think?

Cheezywan
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  #10  
Old 01-06-2017, 01:48 PM
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Question It's your choice

Springs MAY solve the problem, or may not. Springs won't turn it into the Rolls Royce of handguns. A pic of the primers could help. Firing some of the same ammo in another gun could help. How was the gun cared for/stored for those 40 years??? Bottom line without more/better info or the gun in the hands of a competent gunsmith, who knows? The cost/effort may not be worth it unless there is some sentimental value. It was real easy to find brand new SCCY's for app 250$ online.
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Last edited by nachogrande; 01-06-2017 at 02:00 PM.
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  #11  
Old 01-06-2017, 10:36 PM
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First thing I would do is a compete tear down and cleaning. If that does not correct the issue check the firing pin protrusion.
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  #12  
Old 01-07-2017, 08:23 AM
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Quote:
Originally Posted by douglas34474 View Post
First thing I would do is a compete tear down and cleaning. If that does not correct the issue check the firing pin protrusion.









This first. Then, obviously, retry with the same brand "bad" ammunition. If that eliminates the problem then you're golden. I don't know the gun you're talking about but it can't be that hard to change springs and/or firing pin (if available). What would be the cost for that, around 25 bucks or so if you do it yourself?? Not that any of the others offered bad advice, but it sure is easy to spend other peoples money even if that may not be an option at this time. Try to get what ya' got running first within reason. If it wont, then check for other options to purchase.
Of course if you do decide you need something else, many will give you the advice "not to buy a SCCY or a Kahr" save up some MORE money and buy a Glock, Springfield, Smith M&P, HK, Browning Hi Power...........well you get the picture.
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Last edited by simcoe; 01-07-2017 at 08:29 AM.
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  #13  
Old 01-07-2017, 10:45 AM
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Quote:
Originally Posted by Tswitz109 View Post

So i recently got my CWP and have been carrying my fathers almost 40 year old amt 380

I went to the range the other day and shot 100 rounds of 95 grain Remington UMC FMJ ammo.

Out of those 100 rounds, I had 22 misfires where I squeezed the trigger and heard a click but nothing happened.

Im wondering, would it be the firing pin spring, firing pin lock spring, or hammer spring that needs to be replaced?

Or is it something else entirely?

The issue might be caused by hard primers in the ammo that misfired, and/or accumulated dirt inside the FP channel.

There nothing wrong with a 40-year old gun (FWIW, my Browning .380 dates from 1955), as long as it's reliable - as your AMT Backup has been with the Hornady FTX's.

I would shoot up the Remington FMJ's, then tear the AMT down for a thorough cleaning, flushing any hard-to-reach nooks/crannies with a blaster-type gun cleaner or a swish/swirl in a small tub of clean kerosene (Hess gas stations), before lubing it with a lubricant meant for stainless steel (ss can gall if not properly lubricated).


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  #14  
Old 01-07-2017, 02:20 PM
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Originally Posted by douglas34474 View Post
First thing I would do is a compete tear down and cleaning.
With the opportunity to work in a shop with a career law enforcement armorer, I have seen more firearms "cured" with a good dose of Gun Scrubber, and similar than I can count.

I've cured many Ruger MKI/II's that would barely chamber a round, by pulling the panels and squirting away. Same for many other firearms, that were in no way defective mechanically, just fouled by powder residue, pocket dust, bullet lube, etc. (The MKI/II is particularly robust, and a rimfire).

Might be a spring issue, but after decades of use, gunk is a more likely target.
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  #15  
Old 01-07-2017, 02:31 PM
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I would replace the firing pin spring, as it weakens it may not pull the firing pin as far to the rear as it should. Be sure to clean the areas associated with the firing pin thoroughly, and make sure there are no burrs on the FP at the grooved area.
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  #16  
Old 01-07-2017, 09:29 PM
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I concur with others - a complete teardown, cleaning, and relubricating should be the first step.
Been a while since I've seen an AMT Backup, but, as I recall, they were not an easy pistol to field strip. Hence, disassembly for cleaning may not have taken place often.
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  #17  
Old 01-08-2017, 01:35 AM
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I would first determine whether its a gun problem or an ammo problem. Did you try dropping the firing pin on them a second time? I'm guessing there was not another 380 handy to try the same ammo in. Have you tried any other ammo besides your defense ammo?

The suggestions to tear it down and clean are good , whether it's causing your problem or not. If that gun has an internal firing pin, it doesn't take much grit at all to hang it up or obstruct it. Also beware of heavy oil or grease in cold weather that can slow its movement if shooting outdoors.

If everything is good there, then you might just replace the spring for the firing pin.
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  #18  
Old 01-30-2017, 09:35 AM
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misfire

Quote:
Originally Posted by 60DRB View Post
Many folks agree any self defense fire-arm is better than none, when regarding, caliber, or revolver -vs- semi-auto.
This statement is kind of wide ranging. To me any self defense gun that might not go bang when I need it most, like when a bad guy is starting to raise his shotgun in my kitchen, is the worst fire arm that I could own.
I agree that the choice between revolver and semi-auto is a toss up. Caliber is a sticky issue. Do you want to end the confrontation with one shot, or empty a magazine of .22 longs only to wish you had another magazine.

Many times self-defense occurs indoors. in confined space. You are depending on your senses. Whether you fire a .22 or a .44 mag you immediately lose one of your senses, hearing. If you have never fired a weapon in a room in your house (without hearing protection) you have no idea. 40 years later I'm still dealing with hearing loss from it. Caliber choice has another consideration, penetration. In my situation A dog attacked one of my kids on the porch and chased her through the house, I shot it in the kitchen with my .45

I had to replace my hot water heater in the basement afterwards, big hole in the tank from the kitchen above.
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