hi,newbie here with a problem with 645

[dpanc60]

hello,
i recently was given a model 645 semi,
i fired some ball ammo thru it the first time,seemed fine.
i love the heft of it,i really like this firearm,i also seem to shoot quite well with it,so to me it is keeper.
however,after about 2 mags thru it,i would take aim,in s/a and when i pulled the trigger..it would fire 2-3 shots at once,then fire 1 correctly,then spit out 2-3..completely random?
i took it apart,studied the schematic,thouroghly cleaned and lubed everypart i could dissassemble.
tried it out again,seemed ok for a mag or two,then same problem again,repeated procedure again,same result.
it scared the hell out of me,now i am afraid to even fire it as i understand that it is firing out of battery,which could be dangerous.
i like to fix things,so i am trying to avoid taking it to a gunsmith,and money is an issue.
if it is a matter of replacing parts,i can do that,but i have no idea where to start?
any advice/help would be greatly appreciated!
thanks in advance to any suggestion i may get

 

[oldwolf]

I hope someone can help you with this serious problem. I bet S&W would fix if for free. Call them and explain the situation. Keep us posted.

 

[handgunner356]

A couple of things come to mind, a broken disconnector or broken/sticking firing pin. Either way I would not fire the gun again till it is fixed. As mention you might call S&W customer service(800-331-0852) and explain the problem to them. They might offer you a pick up tag to ship it in or you might have to pay to send it yourself, but I bet that they would fix it for free. That is probably going to be your best bet as they will check the whole gun over and make sure everything is up to factory specs. The firing pin and the disconnector are both fairly difficult to replace for a novice.

 

[Fastbolt]

Stop shooting the gun.

Call S&W and explain your experience.

FWIW, while there's no way to know what's happening with your specific gun via the internet, some of the probable causes of the hammer failing to hold in single action include a damaged sear spring (the top of the flat sear spring could be curled to the rear, or the spring could be cracked, and not keeping sufficient tension on the sear's tail), a damaged sear and/or a damaged hammer (single action notch damaged). Any of these conditions could result in unintentional 'double taps' or bursts from a single trigger press.

This isn't a kitchen table repair job for someone inexperienced with S&W pistols (even if they do like to fix things).

It needs to be examined and the cause(s) identified by someone familiar with S&W TDA pistols who is also able to replace any damaged parts.

If I weren't an armorer and it happened in one of my guns, I'd call S&W.

 

[flagman1776]

I have a M645 & it's a keeper. Unintended firing is a safety issue. Call S&W Customer Service... they do not want you to have an unsafe gun.
Russ

 

[dpanc60]

hi again,i appreciate everyones advice,really wanted to avoid shipping it or going to a gunsmith,but it seems it is very unsafe in this condition.
i was hoping i could replace a few parts and be done with it,but it appears that is not the case.
thanks again

 

[novalty]

I would bet that S&W will handle it free of charge. Once you call them, I bet they will mail you out a pre-paid postage label. They will most likely have it fixed and returned to you within 2-3 weeks.

 

[surfgun]

I doubt if it will be free fix on a 645. I sent a 645 (last year) for a new extractor and it cost me $100.00 (for ammo to test function).

 

[dpanc60]

hi,
newbie here again,thanks again for all the advice!
2 quick questions,i was thinking of 1 last attempt before i send it to s&w,i figured it is a used gun,so it wouldnt hurt either way to replace some parts.
i was thinking i should at the least replace the sear spring,recoil spring the three little levers,(dont have the schematic here for the names)they are the ones that surround the hammer,and possibly the sear itself.
and as mentioned,attempting to remove firing pin and inspect/clean(looks tricky to me)
then attempt to fire one more time,think that might do the trick?
also,what can happen if it does still have this issue(obviously it goes to s&w then)but will it blow my hand off?because then i will skip the above and just ship it.

 

[sniper47]

hi,
newbie here again,thanks again for all the advice!
2 quick questions,i was thinking of 1 last attempt before i send it to s&w,i figured it is a used gun,so it wouldnt hurt either way to replace some parts.
i was thinking i should at the least replace the sear spring,recoil spring the three little levers,(dont have the schematic here for the names)they are the ones that surround the hammer,and possibly the sear itself.
and as mentioned,attempting to remove firing pin and inspect/clean(looks tricky to me)
then attempt to fire one more time,think that might do the trick?
also,what can happen if it does still have this issue(obviously it goes to s&w then)but will it blow my hand off?because then i will skip the above and just ship it.

I have to chuckle a little bit, because you seem insistent on fixing this yourself, despite the good advice already posted. I guess if someone is familiar with disassembly and gunsmithing, this wouldn't be a difficult job to do. But as others have already posted, send it back to the factory and let the professionals that built the gun fix it for you. You may have to pay for something, but whatever that is, it will be worth it in the long run. However, if you are committed to fixing it yourself, once you have replaced the various parts and are ready to test-fire the pistol, do yourself a favor and only load three or four rounds. That way, if it DT's on you, it will empty right away. Just my .02 cents.

 

[growr]

This is a safety concern and DO NOT try to repair yourself! Call S&W immediately. For what it is worth any firearm that fires more than one round with one pull of the trigger is considered fully automatic. Unless you are Class 3 and have done all of the correct paperwork ...LET SMITH & WESSON take care of it !!! You will have done your due diligence and will have a factory repair invoice should it ever be necessary. Again, SEND IT TO S&W IMMEDIATELY!
Randy

 

[84CJ]

Hey man I love fixing things myself but this should really be sent back to S&W. It will be back to you ASAP.

 

[hiwaystar]

good call sniper.i'm not a gunsmith by any means but i have detail stripped 39's and 59's quite a number of times....and i do own a 645...never fired. and i can tell you this...all are essentially the same design,and if you attempt it without knowing how the gun is built,you will loose parts. mainly if you remove the slide safety .which you have to do to get at the firing pin and spring.been there ...done that...once. luckily i found the ball and spring after much searching.

 

[SmithMarine]

I carried a 645 for years on Duty. Yours may have had a kitchen gunsmith trying to lighten the trigger pull by stoning the sear. this can easily cause the gun to fire several rounds, or a full mag at once. Send it to S&W for repair before performing more kitchen work on it. If you got the gun free, your still ahead on cost. The gun is a "Machine gun" right now and that is useless now usless the BATF shows you how much that really costs. I have used S&W repair before and they have GREAT customer service.

 

[R Cubed]

I did not see this posted yet, I am sorry if it had, but this needs to be said.

What you have is a FULL AUTOMATIC weapon per AFT&E and the Gun Control Act of whenever. You could be in prisoned for 5 years or more, fined $250K, and nerver, ever be allowed to have a firearm again!!!

You can play with it yourself and take the chance, or, send it to a certified S&W Gunsmith and have the peace of mind. I would send it out, right now as even having it in your possession is a felony!!!

This is of course unless I am mistaken, please correct me otherwise.

Rick

 

[dpanc60]

thanks everyone,
i am gonna just call s&w tomorrow and send it out,no sense replacing parts that may or may not fix it.
i will have more peace of mind/confidence with it anyhow.
i doubt it would be considered a class 3/auto as mostly it fires normally,it isnt as though you pull the trigger and it unloads..it just does it randomly,i could put a few mags thru it s/a and no problem,then out of the blue..d/t..then back to normal..very strange.
i would have thought if it was fiddled with(stoned) it would have done all the time,but anyhow,it going to s&w asap.
thanks again

 

[handgunner356]

Send your worst mag in along with it and you might luck out with a new one when you get it back.

 

[missiondude]

I did not see this posted yet, I am sorry if it had, but this needs to be said.

What you have is a FULL AUTOMATIC weapon per AFT&E and the Gun Control Act of whenever. You could be in prisoned for 5 years or more, fined $250K, and nerver, ever be allowed to have a firearm again!!!

You can play with it yourself and take the chance, or, send it to a certified S&W Gunsmith and have the peace of mind. I would send it out, right now as even having it in your possession is a felony!!!

This is of course unless I am mistaken, please correct me otherwise.

Rick

Someone in Cali was prosecuted for this. Not a problem on the first malfunction that goes auto, but he thought it was cool, kept shooting the "malfunction", told people about it, then was caught. The OP has already documented the malfunction on the forum, therefore he should not shoot the gun again until it is fixed. Send it to S&W...