[Tiger05]

I have recently purchased an M&P 40 and I had a couple of things happen and wanted to know if it is common and will resolve after breaking in. IThe first problem was I had a cartridge jam with rounds in the clip. is this something that will resolve after the pistol breaks in. Also, it was shooting a little low. the range master was watching me and said that he noticed that I was pulling the trigger hard and was pulling the pistol down. I will use a bench rest on my next trip to the range.

 

[Jester]

Not sure what kind of a jam you had. Was it a falure to feed? extract? or a stovepipe?



Most can be caused by limpwristing, some can be caused by ammo.



Finding out the falure will help.

 

[TxPhantom]

Should be OK.....

Hey Tiger05:

I've never had any problems with my MP40 but I've only put a couple hundred rounds through it. It's rare to hear of any FTF's or FTE's from shooters who have put many more rounds down range. If you continue to have problems, remember S & W's lifetime warranty. In all probability you will not have problems in the future though. For some reason some pistols need a break in period and some don't.



Go to the following site for shooting correction advise;

http://www.sportshooter.com/improving/targetgallery.asp

I keep printed copies in my range bag just in case I start shooting funny paterns so I can check out why. :?

 

[raz-0]

Be more descriptive as to the type of jam.



Failure to extract: empty brass stays in chamber, next round tries to feed into the back up it.



Failure to eject: empty brass comes out, but fails to leave the gun.



Mild form: stovepipe. empty brass is sitting verticle jammed between slide and barrel. poking out... like a stovepipe. (usually the shooter, ammo, or springs. Int hat order of likliehood. So unless shooting handloads or tuning your gun with different springs, it's likely you)



Severe form: Death jam. Round extracts, remains more or less square with breach face, tries to feed a live round, which starts up the feed ramp and then has the empty brass rammed into it. MAgazine has to be forcibly yanked out of gun to clear this jam.



Failure to feed: Comes in two basic flavors. One is where the round makes it out of the magazine but not quite into the chamber. This is uaully magazine lips being misaligned, a bad spring, or a REALLY dirty feed ramp. Examining my M&P so far, I don't think you can get the feed ramp dirty enough to screw up feeding. THe other basic flavor is where your rounds don't have the oomph to be pushed up in the magazine. This means something is usually wrong with the spring, follow, or magazine body.

 

[Tiger05]

It tried to feed 2 rounds and locked the slide back

 

[mcone]

It tried to feed 2 rounds and locked the slide back

Hi Tiger05 -



This kind of problem takes a bit a precision in description because there are a few alternatives to what you are describing. I recommend that you read through raz-0's post above and tell us which one occurred.



For example, was the case that should have come out of the gun inside the chamber? Or was the case outside the chamber? If it was extracted from the chamber, what was the case's position? Was it parallel to the axis of the barrel? Was it perpendicular to the axis of the barrel?



-Mike

 

[Jester]

Yep, what he said. being the Mag's design its virtually impossible to feed 2 live rounds at the same time, so I would say that one case didn't fully eject while the slide picked up another round.



Limp wristing will cause that problem, the slide never fully came back.



assuming thats what happened.

 

[ben2112]

Well.. I have fired over 1000+ rounds through mine.. Never had a jam, FTF, FTE.. It is built like a tank...



Now.. When I first started firing mine.. I was all over the place.. Mostly low.. A rangemaster said I just need to get used to it more.. Which is true.. I ended up taking about 400rounds to the range and playing with the different size grips.. Instantly, my control got better when I moved up to the medium grip.. The large grip felt like a brick in my hand and I didn't shoot as well.. But with the medium grip, I am getting really good 3 to 4 in group at about 15yd to 20yds.. Not bad for an old man with thick glasses..

LOL



So play with the grip sizes and take your time and just experiment.. Once that happens.. You will end up being really impressed with the pistol...



Ben