Cetme poly buffer

[david sarnoff]

Anyone have experience with one of the poly CETME buffers in an 91? Black Jack says it will not fit a G 3

[bullseye]

I'm pretty sure you want to avoid the aftermarket buffers for this rifle, or buy a few extra stock sets as you will be breaking the stocks.
http://www.militaryfirearm.com/Forum/showthread.php?p=28294#post28294

[nalioth]

I'm pretty sure you want to avoid the aftermarket buffers for this rifle, or buy a few extra stock sets as you will be breaking the stocks.
http://www.militaryfirearm.com/Forum/showthread.php?p=28294#post28294

Bullseye, the pictured buffer in the original post is the only type you should use.

The ones that insert in front of the end cap and behind the bolt carrier are the ones that cause the receivers to crack.

Do Not Use In A Cetme/G3http://www.buffertech.com/stores/1/images/ct1inst.jpgDo Not Use In A Cetme/G3

You will crack your receiver using this type of buffer

[jfowl31]

Heard only good things about the BJB's

[The Great 308]

Anyone have experience with one of the poly CETME buffers in an 91? Black Jack says it will not fit a G 3

The Black jack poly buffer is a replacement for the original internals of the Cetme buffer and is a very good product. However the Cetme and HK 91 buffers are different internally. Therefore the Black Jack poly buffer internals do not work in an HK91.

You should not have a problem if you want to use a Cetme stock and buffer with the Black Jack poly buffer in it on an HK91. Also you may be able to modify the HK back plate to accept a Cetme buffer.

The best buffer for an HK91/G3 or Cetme is the Heavy 2 stage HK buffer and the next best is the single stage MSG90 buffer. You would have to modify the sock plate and butt stock to use the Heavy 2 stage buffer. For the MSG90 buffer you need to modify the stock because the buffer is longer but the OD is the same as the standard HK buffer. The Cetme buffer is good but I do not think it is any better than the HK buffer.

You can get the MSG90 buffer here for $125
http://www.hkparts.net/91.htm

[M1 Tanker]

You one you have pictured is what you need.

[gunnysmith]

Is there a need for a buffer on a properly operating Cetme?
One of the Cetmes I bought had a heavier then normal recoil.
The unit was disassembled and founf to have a ground bolt. I replaced the bolt head added +2 rollers and ended up with .012 gap.
I inserted a Go gauge and added .001 to the reading.
With the no go gauge gap was around .020.
The recoil was no longer sharp and abrupt.

[The Great 308]

You one you have pictured is what you need.

Tanker, david sarnoff says he has an HK91/G3. The Black jack poly buffer will not work in an HK 91 buffer. The internals of an HK91/ G3 buffer and the Cetme buffer are completely different.


Is there a need for a buffer on a properly operating Cetme?
One of the Cetmes I bought had a heavier then normal recoil.
The unit was disassembled and founf to have a ground bolt. I replaced the bolt head added +2 rollers and ended up with .012 gap.
I inserted a Go gauge and added .001 to the reading.
With the no go gauge gap was around .020.
The recoil was no longer sharp and abrupt.

The Black Jack poly buffer replaces the old worn out internals in your existing standard Cetme buffer. Since the internals of the Cetme buffers have rubber bushings they do wear out eventually with use and time so this is just a way to refurbish a standard buffer to make it preform the way it would have when new.

[gunnysmith]

Thanks I see the correct one on the website now.
The others weren't making good sense.
I'll order some spares, LOL I've got 6 Cetmes.

[texlurch]

Is there a need for a buffer on a properly operating Cetme?
One of the Cetmes I bought had a heavier then normal recoil.
The unit was disassembled and found to have a ground bolt. I replaced the bolt head added +2 rollers and ended up with .012 gap.
I inserted a Go gauge and added .001 to the reading.
With the no go gauge gap was around .020.
The recoil was no longer sharp and abrupt.

Depends on the shooter, as to acceptable recoil. My CETME with good gap recoils noticeably softer than the one with the small, .006 gap. My G3 with good gap recoils soft as well.

And trying to figure the gap change with go-no/go gauges doesn't work too well in the CETME/HK rifles. You can see the gap change, but it really won't tell you the actual headspace in the rifle.

[gunnysmith]

Depends on the shooter, as to acceptable recoil. My CETME with good gap recoils noticeably softer than the one with the small, .006 gap. My G3 with good gap recoils soft as well.

And trying to figure the gap change with go-no/go gauges doesn't work too well in the CETME/HK rifles. You can see the gap change, but it really won't tell you the actual headspace in the rifle.
The reason I did the Gauge was to determine if barrel setback was in order. Not for this particular rifle but as a sample reading for the other Cetmes I have.
If there would have been "0" gain, I would have been more concerned with the repair.
That would have told me the chamber was too far forward, creating excessive head space.

[M1 Tanker]

You right .308....I missed that.

[texlurch]

The reason I did the Gauge was to determine if barrel setback was in order. Not for this particular rifle but as a sample reading for the other Cetmes I have.
If there would have been "0" gain, I would have been more concerned with the repair.
That would have told me the chamber was too far forward, creating excessive head space.

That's a good test. I also examine the face of the trunnion around the barrel, for signs that the bolt has been impacting.

[gunnysmith]

That's a good test. I also examine the face of the trunnion around the barrel, for signs that the bolt has been impacting.

I didn't see any impact on the trunion.
I used Hoppes and one of those angled tooth brushes to clean the trunion, also a baby bottle brush to clean the trunion / receiver area, by both for /aft and rotational motions, then soaked it down with rubbing alcohol, followed by forced air dry.
Nothing unusual showed up during the inspection. I figured I was ready to go with the repairs a that point.
I didn't know there were replacement buffers until this thread.
Thanks all for the URL and the help.:thumbup: