Two new Shields.. Two different trigger pulls ?

[DeeBee]

I have two newer Shields in 40, and one has a very nice trigger pull and break, the other has a nice pull but it feels like it has about a 1-2 lb. heavier break. (its noticeable).
What would cause this? The sear?
I swapped uppers and have narrowed it down to the lower being the problem.
Any ideas?

 

[Atticaz]

I have two newer Shields in 40, and one has a very nice trigger pull and break, the other has a nice pull but it feels like it has about a 1-2 lb. heavier break. (its noticeable).
What would cause this? The sear?
I swapped uppers and have narrowed it down to the lower being the problem.
Any ideas?

Wow. If you narrowed it down the the lower, I am not sure. How does the trigger bars look (more particularly the looped part that move the sear)? The only thing I can think of, off hand, is one of the loops being different in size (which can be adjusted) or a sear being a bit different in the rear. We're they both new?

 

[JustAnotherGunGuy]

I see your on the East coast. Any chance you got a MA trigger I one of them?

 

[DeeBee]

Wow. If you narrowed it down the the lower, I am not sure. How does the trigger bars look (more particularly the looped part that move the sear)? The only thing I can think of, off hand, is one of the loops being different in size (which can be adjusted) or a sear being a bit different in the rear. We're they both new?

Yes, both bought new. Everything looks good, and smooth.Like I said the initial pull is good, it just has a heavier break?

 

[DeeBee]

I see your on the East coast. Any chance you got a MA trigger I one of them?

The one feels like a 5lb trigger and the other feels like an 6-8 lb.? The both are the same part number.
I just wonder if I send it back,if they will say it is in specs, and do nothing?

 

[JFR]

How many rounds through them? If none, it could be a break-in issue. The metal parts are punched at production with very little de-burring if any at all. That's were a little break in helps.

With out a doubt I would put a few hundred rounds through them before thinking of sending them back, for the reason of checking for other issue alone.

 

[robkarrob]

Your swapping the slides eliminates a lot of other likely causes. Since one of your lowers is causing the higher trigger pull issue, then there is only a few things: something dragging, the sear face, the springs, the trigger bar blocker tab. Since you diagnosed it to the lower, my first question is there any noticeable difference to the pull with the slide off? This would show a difference in the trigger spring, sear spring, and dragging. If there is no difference there, I would think either the sear might have a rough face, or the contact area between the blocker tab and blocker might have a bad/rough surface, either could increase the pull pressure. I would doubt these would cause 2+ pounds increase in trigger pull, but if the others check good, there are not many other things to cause the difference in pull pressure, since it is not coming from the slide components.

Bob

 

[SmurfHunter]

Swap the sears and see how it feels

 

[DeeBee]

How many rounds through them? If none, it could be a break-in issue. The metal parts are punched at production with very little de-burring if any at all. That's were a little break in helps.

With out a doubt I would put a few hundred rounds through them before thinking of sending them back, for the reason of checking for other issue alone.

The one thats nice has about 200 rounds through it, and the heavy one has about 500 through it.

 

[DeeBee]

Swap the sears and see how it feels

Thats what I would like to do, but would hate to take all that time. And if that is the problem, what do I do then? Iam telling you the nice one almost feels too nice??.. like maybe a 4.5lb trigger break. I wish I had a guage.

 

[SmurfHunter]

Thats what I would like to do, but would hate to take all that time. And if that is the problem, what do I do then? Iam telling you the nice one almost feels too nice??.. like maybe a 4.5lb trigger break. I wish I had a guage.

I highly doubt either are that low. Suppose to be 6.5. Mine felt crazy light I thought. Used a trigger pull scale and got 6.4lbs. I think your finger scale may be off.

 

[Atticaz]

Thats what I would like to do, but would hate to take all that time. And if that is the problem, what do I do then? Iam telling you the nice one almost feels too nice??.. like maybe a 4.5lb trigger break. I wish I had a guage.

Can you see the backs of the sears? Does one look like it curves back less? There could be a chance that you got a lightly used Shield sold as new that had a sear upgrade. My trigger pull is 4.5 w/ the Apex sear installed.

 

[bulldogman]

You may have 2 different sears. My Shield has the old mim sear even though it was a test fire date 5-13, my 9c has the newer production sear but has a test fire date of 3-13.

 

[robkarrob]

Status on these Shields. Did you buy them new, one new and one used, or both used? The idea that you don't know if either has been modified may be the difference.

Bob

 

[DeeBee]

Status on these Shields. Did you buy them new, one new and one used, or both used? The idea that you don't know if either has been modified may be the difference.

Bob

Both were brand spankin new!

 

[DeeBee]

You may have 2 different sears. My Shield has the old mim sear even though it was a test fire date 5-13, my 9c has the newer production sear but has a test fire date of 3-13.

How can I tell the difference?

 

[bulldogman]

There is a thread "Articles - M&P Production Updates: Slide Stops, Barrels, Sears" down the page a little bit, it shows the difference in shape between the sears. You can see the shape of the sear by looking at the trigger group from the right sight of the gun with the slide off.

 

[PeterWD]

New Shields with different pulls

If all the checking and comparing don't answer the issue, I'd call S&W, ask them if either the serial numbers were for the Massachusetts market. I've seen other posts elsewhere that said two Mass. Shield models had been sold in two different States somehow.

 

[Atticaz]

There is a thread "Articles - M&P Production Updates: Slide Stops, Barrels, Sears" down the page a little bit, it shows the difference in shape between the sears. You can see the shape of the sear by looking at the trigger group from the right sight of the gun with the slide off.

I missed that post. Thanks for pointing that out. That could very well be the issue. Nothing an Apex sear couldn't fix, if he does have on old sear.

 

[robkarrob]

If the tests I explained check negative for a difference, then the sear or the blocker tab are causing the difference in pull. With the slide off, check the shape of the top rear of the sears. Do they both have the bump/lip at the top rear? This bump adds one extra pound of pulling pressure. If they both look the same, check the shape/smoothness of the blocker tab, the pointed tab that sticks up from the trigger bar (bar that runs from trigger to sear on the right side). You are looking for a difference between the two guns.

Bob