hello, new member here with a question about a S&W model 410 .40 cal. pistol i recently purchased. Went to the range today with some friends and shot my M&P9,and a friends M&P15(wanting the M&P 15 rifle really bad now) have shot many double action pistols with several thousand rounds through a beretta 92fs, and 96 model pistols but when shooting the model 410 today i would have what i guess is doubling . fire one round and a second round would fire. not sure if its me or the gun since i have never had this happen before even shot a friends ruger .40 cal and didn't have this issue. only happens with my 410. the 9mm M&P was flawless and didnt have any jams of ftf with either gun. it is a used pistol so i am thinking i need to replace the springs and maybe get it tuned up a bit. single action pull is very light. Pistol is capable of great accuracy if i do my part. completely shot away the face of a zombie target. just looking for advice on what could cause a second round to go off so easy. I'm hoping its a simple fix as i'm confused. i know its not a heavy recoil thing i've shot guns with way more than the little .40 cal. any thoughts would be nice. thanks. this is a great forum

Perhaps you could better explain yourself.

You pill the trigger once and get two rounds to fire?

You pull the trigger once and get one round to fire but the next round is much easier to fire?

Are you firing double action then single action or single and single?

Not quite sure what it might be but I can tell you that it's not normal. My Mod. 410 does not do that.

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I reckon so

No way to know what's happening with your gun, since I can't be there to see you shoot it or examine the gun.

Some thoughts in general, though, if one of our guys were to report this condition ...

The common mechanical reasons a 3rd S&W TDA pistol might start "doubling", or firing in "bursts", would be a damaged sear spring, damaged sear or damaged single action cocking notches on the hammer.

Was the gun bought used? If so, you have no way of knowing whether the previous owner(s) might have done some "kitchen-table gunsmithing" and damaged or more of those parts.

Those are the common mechanical issues.

Now for the "shooter" influence.

Have you ever fired a S&W TDA pistol before, or done so very much? The Beretta DA/SA & DAO pistols you mentioned have much longer trigger/sear reset points.

If you're one of those shooters who likes to keep your finger on the trigger between shots, trying to "prep" the trigger for the next shot, or "ride the reset", it's possible the recoil of the .40 S&W is causing you to unintentionally fire another shot as you "rock the trigger" under recoil.The S&W TDA guns have a very short mechanical hammer/sear/trigger "reset" in single action mode. I've watched it happen to a fair number of shooters over the years when they didn't get their fingers off the trigger after their intentional shot.

It may be fun to do on the range, but it can create the potential for a tragic occurrence when using a pistol in the real world. Firing an unintentional shot is not a good thing. Keeping a finger on the trigger before the decision is made to intentionally fire a shot can create the potential for a negligent discharge due to an involuntary muscular contraction (from being startled, hand/finger confusion, a muscular tremor, etc), especially when trying to do so under stress (when fine motor skills start to deteriorate).

The pistol probably ought to be checked out by a gunsmith familiar with S&W TDA pistols to see if a mechanical condition exists that requires correction and repair. Easy enough for a gunsmith, the factory or an armorer.

If the pistol is found to be in normal good working condition, you might consider turning your attention to the shooter influence as far as your trigger technique is concerned.

Please don't take my comments personally. You may be a highly skilled competitive shooter and have outstanding trigger technique, and just a gun that requires repair.

I'm only listing some of the typical causes I've learned to be responsible for this sort of occurrence, from the perspective of being a LE armorer for 3rd gen pistols, as well as being a LE firearms instructor.

Just some thoughts.

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Ret LE Firearms inst & armorer

Punisher102: it happens when firing in single action. before i am able to reacquire sight picture for next shot.
Fastbolt:yes it is a used gun and i have decided to take it to a gunsmith and have all springs replaced. i appreciate all comments as though i am not new to shooting guns i'm not very skilled and do need practice. although my riding the trigger forward could be part of the problem as well. although i'm mechanically inclined i will not try and do any gunsmithing myself. most i will do on my own is change mag springs and recoil spring. i am enjoying this pistol enough that i plan on a 5906 next. since i prefer 9mm so i can afford more trigger time. thanks for the replies
ETA: whether or not its a mechanical issue it gives me good reason to take it the gunsmith and let him work his magic.