M&P 9mm

[bwgilley08]

Couple questions. What is the difference between striker fire and double action? Also, is there any difference at all with the 17+1 9mm and the 10+1 9mm? Like size, weight, etc? Thanks.

 

[robkarrob]

You may get a long explanation by some. A striker fired gun can be single action fired and double action. Then there are single and double action hammer fired guns. In single action the movement of the trigger causes one action. Double action the trigger movement causes two actions. Example of a single action: trigger movement causes the sear to move down and releases the striker/hammer. Double action the trigger movement causes the striker/hammer to be pulled back further and then the sear moves down to release the striker/hammer (two actions in one trigger pull).

Mag difference is going to be weight and length. Some weight is the length of the mag but mostly the weight differences is the weight of the extra cartridges. The length of the mags will be shorter with less capacity and the mag will likely will be flat/flush to the bottom of the grip. The higher capacity mags will stick further out from the bottom of the grip.

Bob

 

[shawn mccarver]

Your question concerns two different things. First, the method by which the firing pin strikes the primer. Second, the type of action of the firearm.

First: A striker fired pistol is different than a hammer fired pistol. In the hammer system, the trigger interacts with a hammer, which strikes the firing pin which, in turn, strikes the primer, causing the weapon to discharge. In the striker system, the trigger interacts directly with the striker, and the striker is released under spring pressure to strike the firing pin, which discharges the weapon.

Double action is a description for a type of firing action of a weapon. Revolvers are typically single or double action. In single action, the hammer must be manually cocked, or drawn to the rear, and the trigger merely releases the hammer, which goes forward under spring pressure to strike the firing pin, which discharges the weapon. In double action, the trigger is used to both release a cocked hammer and to draw the hammer from a rest position to fully cocked, and then to release the hammer to strike the firing pin which fires the weapon.

In a pistol, the term double action generally means that the trigger draws the hammer to the rear, then releases the hammer to fire the pistol. In the Glock, for example, the striker rests in an intermediate position, not fully at rest, and not fully back under spring tension. The trigger in the Glock draws the firing pin fully rearward until the trigger engagement with the firing pin is released to fly forward and strike the primer.

In a pistol, the term double action usually, though not always, refers to a type of action in which a hammer or striker is not fully cocked and the double action trigger pull draws back the hammer or striker, then releases the hammer or striker to fly forward to fire the weapon.

 

[bwgilley08]

Which one is the better of the two actions to purchase? Striker fire action or double action? As I look to purchase, I have the option of either one. Also have the option of 10+1 or 17+1, although the weight of the guns looks identical.

 

[bwgilley08]

I'm sorry, let me rephrase the first part:
Which action is better, striker fire or striker fire (double action)?
Those are the two options on Smith and Wesson website.

 

[SteveFi]

. Also have the option of 10+1 or 17+1, although the weight of the guns looks identical.

some states have magazine capacity restrictions - if you dont live in one of those states then get the larger capacity magazines - no difference at all if it is the exact same model pistol you are comparing - i take it you are looking at a full size M&P9

 

[robkarrob]

Forget what the S&W website shows. Some models descriptions say double action striker fired and other show striker fired. They both are the same in the all M&P models. They all push the striker back a very minimal amount, approximately 1/32 inch, near the end of the trigger pull, just before the sear releases the striker. This could be considered double action, but 1/32 inch is next to no additional striker movement, which makes them single action. If you want an M&P pistol, pick the model you want and forget about the terminology, they all operate as single action.

Some will argue that the M&Ps are double action. I submit that if you install an Apex sear, which does not have the sear "bump", then the double action goes to single action, as the striker does not get moved any further back. So does a sear only change really allow a gun to go from double action to single action? Does 1/32 of an inch of extra striker movement make the gun a double action? I think the term double action for a M&P pistol, is being way too technical.

Bob

 

[Bkreutz]

Forget what the S&W website shows. Some models descriptions say double action striker fired and other show striker fired. They both are the same in the all M&P models. They all push the striker back a very minimal amount, approximately 1/32 inch, near the end of the trigger pull, just before the sear releases the striker. This could be considered double action, but 1/32 inch is next to no additional striker movement, which makes them single action. If you want an M&P pistol, pick the model you want and forget about the terminology, they all operate as single action.

Some will argue that the M&Ps are double action. I submit that if you install an Apex sear, which does not have the sear "bump", then the double action goes to single action, as the striker does not get moved any further back. So does a sear only change really allow a gun to go from double action to single action? Does 1/32 of an inch of extra striker movement make the gun a double action? I think the term double action for a M&P pistol, is being way too technical.

Bob

I believe the reasoning behind the "double action" description was to make it saleable to departments that had a "double action" requirement in their specification for service weapons. I think describing a M&P autoloader as double action is silly. If you pull the trigger and it goes "click" (no fire), will pulling the trigger again strike the primer a second time? No, that makes it single action in my definition. There, I said it, now waiting for all the posts that I've read about this on this forum to be drug up again.