M&P15-22 Blue Springs

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rhassick1

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I was wondering if anyone knows what the difference is between the newer blue springs and the older silver springs for the bolt and trigger. Are there any differences in the strength of the blue springs versus the silver?

My rifle was purchased about a month ago S/N DTX3XXX and is has the silver springs. For the most part it has worked fine but I did have a few problems yesterday for the first time at the range were it seems like the bolt did not travel back far enough after firing to eject the spent casing and reset the hammer. Maybe just a few under power rounds found there way into the box of Federal 550's.

Wondering if anyone else has had this problem?
 
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the bolt return spring is heavier and the hammer spring is lighter.. with the blue springs the hole point is to get the bolt to slam harder forward to avoid oobs.. by reducing the hammer spring weight it allows for a heavier bolt return spring... if your having problems romove the hammer spring and bend the legs or clip 1 of them off this will redice the hammer springs resistance on the bolt and allow it to cycle harder... hope this helps

if you dont wanna bend or clip your spring.. call j&p enterprices and get their 10 dollar spring kit.. it drops trigger weight in half and does the exact same thing for your cycling problems
 
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Thanks for the information. Sound like it might be worth doing this for $10 since the trigger pull is a little on the stiff side anyway.
 
I just installed the JP springs as they came with my trigger kit. The "red" hammer spring is a medium weight spring that is lighter than the standard silver that came stock on my 15-22. I'm using the "yellow" trigger spring which is also lighter than the stock silver spring.
*Note on some match grade lower velocity ammo my gun wouldn't cycle the ammo 'cause the recoil wasn't strong enough to push that heavy hammer spring(silver) back. With the JP spring all ammo cycles; well I shouldn't say that as I haven't tried sub sonic.
 
Heith,
Thanks for the information. I just placed an order for a new set of JP springs. Hope this will resolve any issues with incomplete cycling.
 
I was thinking of replacing my stock springs in the 15-22 with some JP springs also. Does anyone know where I would find a tutorial on changing out the springs?

Thanks
 
its simple.. you need to remove 2 pins.. and just look at how the springs go on the hammer and the trigger replace them the same way the only tool you need for the job is a small screw driver or allen wrench to use to push the pins out with.. then use it as a guide when reinstalling them

boltman said:
I was thinking of replacing my stock springs in the 15-22 with some JP springs also. Does anyone know where I would find a tutorial on changing out the springs?

Thanks
Click to expand...
 
What's the part number for the proper J&P springs? They have four listed...SC
 
Boltman,
Look at the posts by Brett248Vista on this site. He has some excellent tutorials on the M&P15-22. One is on removing and installing the firing group. It is very easy, just did myself this past weekend.
 
rhassick1,

Thanks for passing along the info!

There is a sticky thread at the top of these forums linking to my 15-22 Videos.

I cover removal and re installation of the Fire Control Group.
 
When you click on the link you will see instructional videos on installing the entire trigger system. Just take the disassembling part into account and replace springs. but watch the whole video to get a good understanding on how the mechanics work on fire controls.
 
I did the "15 minute AR15 trigger job" on my rifle. Results in a much weaker hammer spring and lighter trigger pull. Really only takes 15 minutes if you're familiar with the lower parts. 100% reliable ignition as well.

-- Chuck
 
what is the original spring poundage? just want a comparative difference
 
i dont think anyone knows but people have reported testing theirs at upwards of 8lbs.
 
I don't think the poundage was the problem with mine. It was the consistency. Sometimes it would pull straight through and sometimes it would snag. Now it's a smooth consistent 3.5#
 
BELT_FED said:
its simple.. you need to remove 2 pins.. and just look at how the springs go on the hammer and the trigger replace them the same way the only tool you need for the job is a small screw driver or allen wrench to use to push the pins out with.. then use it as a guide when reinstalling them
Click to expand...

Thanks for the response, I am new to the AR platform and didn't want to screw anything up. I took apart my 10/22 years ago and that wasn't too bad, just didn't know what I was in for with the 15-22. The stock trigger on the 15-22 is a "beast" . It has to be somewhere between 7-9 lbs.


Thanks Brett248Vista for the links.
 
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I am looking for a lighter pull, is this the way to go?? Using the JP spring kit?
 
i'm using the whole trigger kit(trigger,springs,disconnect) and it is definitely lighter, shorter, and smoother.
The springs alone wont give you all this as the whole trigger system lets you tune in the travel/hammer release, over travel, and disconnect.
 
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rhassick1 said:
I was wondering if anyone knows what the difference is between the newer blue springs and the older silver springs for the bolt and trigger. Are there any differences in the strength of the blue springs versus the silver?

My rifle was purchased about a month ago S/N DTX3XXX and is has the silver springs. For the most part it has worked fine but I did have a few problems yesterday for the first time at the range were it seems like the bolt did not travel back far enough after firing to eject the spent casing and reset the hammer. Maybe just a few under power rounds found there way into the box of Federal 550's.

Wondering if anyone else has had this problem?
Click to expand...

I had an early one and experienced problems (oob, ftf, fte and a blown out extractor and the dealer allowed me to return it. I have recently purchased a new one (3-6-2012). I went to the range and went through about 200 rounds of federal bulk with zero problems. Upon examining it I found that it has a blue spring. Hope this success continues. Serial #DWW9***
 
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