MP5 Lower/Trigger Pack Questions...

[MallNinja]

What is the difference between a factory correct 3-pin swingdown and a clipped and pinned lower?

Where are the 3 pins on the MP5 trigger group? Evey picture I've ever seen has only 2 holes. Can you please provide me some info on this?

Thanks!

 

[Mike85220]

What is the difference between a factory correct 3-pin swingdown and a clipped and pinned lower?

The factory gun has a the lower that when the rear stock pin is removed, it is still attached to the receiver pin. It can swing down sort of like the rear pin on an AR being pushed out.

When the stock pin is removed on the clipped on semi lower, it does not swing down, it needs tugged rearward to remove the lower.

The reason they made the clipped version is so that the original full auto lower could not fit onto the semis.

 

[Mike85220]

I will elaborate a little more... I am bored.

The swing down guns you will find are all just semis that they machined and welded to make into a factory correct set-up. It is seen as more desireable as the original full auto lowers can swap out. This is done only on the registered receiver guns, I am told that doing this on a sear gun was a no-no as it is TWO machineguns.

There are some RR guns that do not have a swing down lower.
The lower is actually modified to fit all the original HK full auto parts.
The lower is actually in itself a conversion part.
As such, the gun is married to that lower.
You cannot legally sell off that lower and use another.
See it like this, it is actually a registered trigger pack that is married to the gun.

There are registered trigger packs out there too.
They can be installed on several different HKs and not have to be married.
It is all in how it was papered, that is the difference.

Mine is a RR gun without a swing down lower. So it is a trigger pack married to the gun. I wish I got the registered trigger pack instead so I can swap it around.

Sear guns can run or be problematic. It is all in who installed the sear. Sears can wear, and then the timing is off when it goes past specs. There is only so many times you can reweld the same chunk of metal to specs. Qualified made the best sears, they were tool steel, and probably wont ever wear. Ciener made the worst, and it was also his own proprietary design which wore out and broke quicker.

 

[MallNinja]

So where are the 3 pins? Can you show pictures? Because the one on Vito's webpage http://www.onlythebestfirearms.com/3pinmp5.html, is a 3-pin, but I only see 2 pins... Im confused... thanks Mike for your illaboration... I know enough about Mp5's the be dangerous, but not enough to be deadly. I know the differences between sear/sear pack and the two types of RR. I know about the function and timing.. I know about the typical problems, I know the various configurations and all that, I just dont know where the 3rd pin is on the lower... :Iaresmart

 

[Mike85220]

The lower covers it.

 

[Mike85220]

Here is a good pic of the swing down on a G3.

Also, look at this MP5, it shows in the same spot that pin.

The front of these lower shows the pin.

I will have to crack out my MP-5 someday and look at it again, but I am sure where the pin is supposed to be, it is just a hole there as mine is a clip on.

 

[tunnelrat]

What is the difference between a factory correct 3-pin swingdown and a clipped and pinned lower?

Where are the 3 pins on the MP5 trigger group? Evey picture I've ever seen has only 2 holes. Can you please provide me some info on this?

Thanks!

To my knowledge the MP5 and the HK33 swingdown grip housings are only two pin - one for the receiver and one for the stock, and as such are interchangeable between the two receivers. The G3 swingdown is three pin - one in front and two for the stock. If for some reason you want to use a G3 swingdown housing (they are more plentiful, thus cheaper) on a MP5 or HK33, you can trim off the extra hole, because other than that they are all the same. The MP5K/SP89 grip housing is altogether different, and will only fit those weapons.

 

[TrippHammer]

Your forgeting to mention that Curtis @ S&H and Bill Flemming moved the sear up and forwards. The auto sear is not at all in the same location as a factory gun.

You can see where they cut the corner out of the pack on the lower end.

 

[TrippHammer]

Its difficult to explain, but Bill and Curtis changed the whole design around.

The factory guns work in a different way.

If I had my sear pack in my had I could show you more about what you are asking.

 

[Renegade]

What is the difference between a factory correct 3-pin swingdown and a clipped and pinned lower?

Where are the 3 pins on the MP5 trigger group? Evey picture I've ever seen has only 2 holes. Can you please provide me some info on this?

Thanks!

My turn:

On a factory MP5 there are 2 pins. Front and Rear.

On a Factory G3 there are three pins, 1 Front and 2 Rear.

Regardless, a MP5 Trigger housing will fit a G3, just not use the 1 Rear hole.

A clipped and pinned lower has 1 pin, the rear pin. The front pin is fake and instead of using a pin, the housing slides onto a tight-fitting shelf.

The MP5 on Vitos web page is 2 pin, not sure why you think it is 3 pin.

 

[Magoo]

Not quite Correct in your descriptions.

I will elaborate a little more... I am bored.
1).
The swing down guns you will find are all just semis that they machined and welded to make into a factory correct set-up.

All HK Rifles started as Full Auto's. All but a couple of the Dual Push Pin guns are the Registered Full Auto Receiver guns. Mr. Vollmer had a few Dual Push Pin "Sear" guns made before ATF ruled against him and they we're Grandfathered as Not Seperable either.
HK had the Semi "Shelf" installed to create the "Semi" version and to make them Importable as Semi only.

2).

There are registered trigger packs out there too.
They can be installed on several different HKs and not have to be married.
It is all in how it was papered, that is the difference.

Some people have "Registered Trigger Packs that are really "Registered Sears". A "Registered Trigger Housing" is different for sure as you stated- ALL Parts can be "Replaced" at will and Not Repaired. I have 2 of them available if anyone is intersted.
http://www.uzitalk.com/forums/showthread.php?p=276619#post276619

 

[Superduty]

Well if the cetme an g3 trigger grours will iterchange then what I wold like to no it it would work on a hk mp5 22lr

 

[Superduty]

Even though I no one is a rimfire an the other is centerfire

 

[slimshady]

The current HK branded .22s are a different internal design than the real deal MP5/G3/etc. Some things like the stock and forearm MIGHT interchange, but the trigger mechanism is totally different.

 

[PeterNNH]

I will elaborate a little more... I am bored.

The swing down guns you will find are all just semis that they machined and welded to make into a factory correct set-up. It is seen as more desireable as the original full auto lowers can swap out. This is done only on the registered receiver guns, I am told that doing this on a sear gun was a no-no as it is TWO machineguns.

There are some RR guns that do not have a swing down lower.
The lower is actually modified to fit all the original HK full auto parts.
The lower is actually in itself a conversion part.
As such, the gun is married to that lower.
You cannot legally sell off that lower and use another.
See it like this, it is actually a registered trigger pack that is married to the gun.

There are registered trigger packs out there too.
They can be installed on several different HKs and not have to be married.
It is all in how it was papered, that is the difference.

Mine is a RR gun without a swing down lower. So it is a trigger pack married to the gun. I wish I got the registered trigger pack instead so I can swap it around.

Sear guns can run or be problematic. It is all in who installed the sear. Sears can wear, and then the timing is off when it goes past specs. There is only so many times you can reweld the same chunk of metal to specs. Qualified made the best sears, they were tool steel, and probably wont ever wear. Ciener made the worst, and it was also his own proprietary design which wore out and broke quicker.

Hi Mike85220 could you tell me where you have seen or have experienced "Sears can wear" and at which location on the sear does this happen thanks. Regards, PeterNNH