Beretta 948 "Slam fire" - Pistolsmith
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Old 01-19-2013, 11:03 AM   #1
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Beretta 948 "Slam fire"

I have a 22lr in a Beretta 948 that has developed a habbit of firing when the slide is released. I was wondering if inertia, paired with a weak spring, could possibly cause this. If so, how do you remove the firing pin and spring from this model. Im thinking from looking it over, there must be a pin under the rear sight holding it in.

I have cleaned the pistol as well as i know how to. Sprayed solvent inisde the firing pin hole and tried to remove any gunk that may have built up over the years of storage.

If you could share informtion to help solve this issue, I would appreciate it.


Jason Badley
 
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Old 01-19-2013, 07:57 PM   #2
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Having never disassembled a 948, I took a look at the only schematics I could find online. The firing pin definitely is held in place by a pin, but there is no "firing pin retention pin" listed anywhere. This leads me to believe the extractor pin does double duty holding the extractor in place as well as the firing pin. This is only an educated guess...there is no pin under the rear sight.
 
Old 01-21-2013, 12:04 AM   #3
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On page 68 of Troubleshooting Your Handgun by J. B. Wood, he mentions the firing pin is full reach, non-inertia. Do NOT carry with the hammer down on a live round.

The same pin does retain both the firing pin and extractor.

You most likely need a new firing pin spring.
 
 
Old 01-21-2013, 05:28 AM   #4
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Thank you for the info. Im going to find that book and do some reading.
 
Old 01-21-2013, 05:55 PM   #5
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You're welcome and good luck.

The book is OOP - got mine over 30 years ago. They do show up on ebay.

In order to ascertain the retention of the firing pin, I had to look at the schematic for a model 84 or 86 on gunparts.com (Numrich). From the book I knew it would be close enough for this as a 948 is a majorly modified 34 and the later models have the same arrangement in the slide as the 948 as far as I can tell.
 
Old 01-21-2013, 09:18 PM   #6
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As always with an automatic pistol with a hammer, consider that what might be happening is the hammer may be dropping as the slide slams shut and it has nothing to do with the firing pin.

In that case, you'd need to be looking at the hammer and sear system.
 
Old 01-21-2013, 09:31 PM   #7
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Quote:
Originally Posted by dfariswheel View Post
As always with an automatic pistol with a hammer, consider that what might be happening is the hammer may be dropping as the slide slams shut and it has nothing to do with the firing pin.

In that case, you'd need to be looking at the hammer and sear system.
I thought about that too, but since the 948 is single action, I figured he'd notice it.
 
Old 01-22-2013, 03:57 AM   #8
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I thought of that. I videoed the malfunction. It's hard to tell because it happens so fast, but the hammer seems to not be falling. Plus I can not make the hammer fall when releasing the slide on a empty chamber.

I was able to order the book on Amazon for 8 bucks.
 
Old 01-22-2013, 04:00 AM   #9
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I tried to post the video here, but was unsuccessful. I was able to post it on 24hourcampfire.

Beretta 948 double fire - 24hourcampfire
 
Old 01-22-2013, 04:19 AM   #10
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Do you think Beretta used similar firing pin springs in there other models of small pistols? Looking at pictures it appears the may be longer, hard to tell. But thought I could cut to fit, if the were of the same strength.
 
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