Walking trigger and hammer pins

ManoP

ManoP

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How many of you guys out there have opened up a brand Ar15 and within a few mags, the trigger pin walks out on you? Just had it happen today. Kinda upset. I know there's kit's to remedy this but on a brand new rifle? This is my second S&W M&P sport 2. My first one has never failed. Thoughts?:bangHead:
 
I've had the hammer pin walk out on a new gun. Turned out the J-spring was missing from the hammer. I forget how I got one but once I did it was an easy fix.

I've also seen the trigger pin walk when the legs of the hammer spring weren't installed properly. Takes 30 seconds to fix.

If the springs are right the pins shouldn't walk.
 
My thought was to shorten the springs to get the geometry correct but I didn't even think that they could be installed incorrectly.
 
ManoP said:
My thought was to shorten the springs to get the geometry correct but I didn't even think that they could be installed incorrectly.
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If you aren't familiar enough with the AR trigger group to tell that the spring is not installed correctly how would you know how to cut it to the correct "geometry"?
Unless you are running a Norinco the springs are probably in spec and just installed incorrectly.
Find a nice exploded view of the trigger group and you'll be able to tell how it's supposed to be (that's how I learned to do my first one).
 
I'd uninstall and reinstall the trigger group. I've never had one walk, so I'd be suspicious of something being installed wrong or it being out of spec.
 
ctcs said:
KNS anti-rotation pins can prevent walk
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True, but also a complete waste of money if the only problem is the hammer spring installation.

The legs of the hammer spring need to sit on the trigger axis pin, not on the floor of the receiver. One of the legs should then be in position to fall into the retaining groove on the axis pin.
 
ManoP said:
My thought was to shorten the springs to get the geometry correct but I didn't even think that they could be installed incorrectly.
Click to expand...

If mil-spec fire control groups are installed correctly in a mil-spec lower they will not walk out. Hence the important aspec....mil-spec. How are the US and other M4/m16 held in?
 
BattleRife said:
True, but also a complete waste of money if the only problem is the hammer spring installation.

The legs of the hammer spring need to sit on the trigger axis pin, not on the floor of the receiver. One of the legs should then be in position to fall into the retaining groove on the axis pin.
Click to expand...
This!!!

Sqr said:
If mil-spec fire control groups are installed correctly in a mil-spec lower they will not walk out. Hence the important aspec....mil-spec. How are the US and other M4/m16 held in?
Click to expand...

And this!!! :cheers:
 
So it turns out the spring was in fact installed incorrectly..... Literally a 2 minute fix after I compared it to the first sport 2.
 
faizi said:
What kind of the quality control S&W AR15 has??
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Very low is the answer. Ensuring the spring is installed correctly comes down to the monkey that installed it and the guy inspecting the rifle before shipment. Odds are the monkey installing it hasn't a clue and the guy inspecting doesn't exist.. You get what you pay for.

ManoP said:
Brand new one.... I mean it took about a half dozen mags before it walked out so it is possible it was missed at the factory
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It absolutely was missed at the factory. Unacceptable error that should have been caught and rectified before shipment..
 
Kidd X said:
Very low is the answer. Ensuring the spring is installed correctly comes down to the monkey that installed it and the guy inspecting the rifle before shipment. Odds are the monkey installing it hasn't a clue and the guy inspecting doesn't exist.. You get what you pay for.



It absolutely was missed at the factory. Unacceptable error that should have been caught and rectified before shipment..
Click to expand...

Then I must say that monkies at Norinco are more skilled.lol
 
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