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G3 / Cetme Receiver Dimensions
Weaponeer Forums : G3 / CETME / MP5 / HK

Posted in G3 / CETME / MP5 / HK
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  blurrededge

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Posted: December 28 2009 at 1:45pm | IP Logged Quote blurrededge

Can anyone check and verrify these dimensions for me?

Receiver thickness (from Flat) from 0.055" to 0.062"
Inside Diameter of Bolt Carrier tube = 1.531" (based off of front trunion)
Outside Diameter of Bolt Carrier tube from 1.678" to 1.680"
ID of cocking tube = 0.707"
ID of cocking tube section on receiver = 0.780"
OD of cocking tube section on receiver = 0.890"

I don't have an actual receiver to check, so any help would be appreciated.

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Posted: December 29 2009 at 5:42pm | IP Logged Quote blurrededge

Nobody wants to dig one out of the safe and take the micrometer to it for me?
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  colww

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Posted: December 29 2009 at 6:18pm | IP Logged Quote colww

OK I will.. can you wait till the weekend?
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  blurrededge

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Posted: December 29 2009 at 6:46pm | IP Logged Quote blurrededge

Beggers can't be chosers, I appreciate you doing it. I just want to make sure I have the right sizes before I place my next metal order. I'll be attempting this kind of receiver.
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  colww

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Posted: December 29 2009 at 7:06pm | IP Logged Quote colww

Well.. I have flat from ORF, rifles from Springfield Armory and a German HK 91.. which one do think will be best?
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Posted: December 29 2009 at 7:38pm | IP Logged Quote colww

OK I Did it now...

 

Receiver thickness (from Flat) from 0.055" to 0.062" = .60
Inside Diameter of Bolt Carrier tube = 1.531" (based off of front trunion)not yet
Outside Diameter of Bolt Carrier tube from 1.678" to 1.680"=1.50
ID of cocking tube = 0.707"=.727
ID of cocking tube section on receiver = 0.780"=.730
OD of cocking tube section on receiver = 0.890"=.771

I don't have an actual receiver to check, so any help would be appreciated.

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Posted: December 29 2009 at 7:58pm | IP Logged Quote colww

Inside Diameter of Bolt Carrier tube = 1.531" (based off of front trunion)=1.538 from a virgin FMP Trunion
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Posted: December 29 2009 at 8:02pm | IP Logged Quote colww

All of these are from the ORF flat,  FMP parts and the Springfield.
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Posted: December 29 2009 at 8:07pm | IP Logged Quote colww

Any questions and check it again, I want to do it right for you.
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  blurrededge

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Posted: December 29 2009 at 11:34pm | IP Logged Quote blurrededge

Hmmm.
The closest tubing dimensions I can find are as follows. The OD can easily be adjusted by turning down on the lathe, I don't have much for boring capabilities though... probably the best I could do would be to use a brake cylinder honing tool to open up the inside...

For receiver main tube: 1-3/4" OD {A} x 1.532" ID {B} x .109" Wall {C}

For cocking tube section: 7/8" OD {A} x 0.709" ID {B} x .083" Wall {C}

I may just order some anyway to see if it will work. I am gratefull to you for helping me out.
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Posted: December 30 2009 at 11:48am | IP Logged Quote dcorb

blurrededge wrote:
Hmmm.
The closest tubing dimensions I can find are as follows. The OD can easily be adjusted by turning down on the lathe, I don't have much for boring capabilities though... probably the best I could do would be to use a brake cylinder honing tool to open up the inside...

For receiver main tube: 1-3/4" OD {A} x 1.532" ID {B} x .109" Wall {C}

For cocking tube section: 7/8" OD {A} x 0.709" ID {B} x .083" Wall {C}

I may just order some anyway to see if it will work. I am gratefull to you for helping me out.

Did you check aircraft spruce? The seem to have all sorts of tubing

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  tr6guns

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Posted: December 30 2009 at 4:25pm | IP Logged Quote tr6guns

Outside Diameter of Bolt Carrier tube from 1.678" to 1.680"=1.50
Inside Diameter of Bolt Carrier tube = 1.531" (based off of front trunion)=1.538 from a virgin FMP Trunion ??? Is there something i am missing here?????
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Posted: December 30 2009 at 6:06pm | IP Logged Quote colww

tr6guns wrote:
Outside Diameter of Bolt Carrier tube from 1.678" to 1.680"=1.50
Inside Diameter of Bolt Carrier tube = 1.531" (based off of front trunion)=1.538 from a virgin FMP Trunion ??? Is there something i am missing here?????

In "virgin" i meant that it is new and has not used or drilled.

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  blurrededge

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Posted: December 30 2009 at 6:49pm | IP Logged Quote blurrededge

I think he was reffering to the ID being just larger than the OD.
I think with the tubing I am going to get, the carrier will still slide inside. I can always expand the tube slightly to make it larger if needed, when the tubes are cut to be welded together. If the carrier fits, but trunnion is too big, I'll just have to turn the trunnion down on the lathe until it's a snug fit.

Dcorb. I checked aircraft spruce, and their stuff is the same as onlinemetals, and mcmaster, and a bunch of other places. The only one I found with close enough dimensions was speedymetals, and the tubing is low carbon , but I think it'll still work. Might just have to try case hardening maybe, but it might be ok as is.
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Posted: February 06 2010 at 4:35pm | IP Logged Quote Boondoggle

A bit late for this discussion, but figured it would fit here.

I run a Coordinate Measuring Machine at work, so I took a piece of scrap demilled G3 receiver in to scan. This is the buttstock end I bought to salvage the sight mount and stock pin block. It fits snug but smooth into the buffer mount. The rails seem a bit wide. At the cutoff end they are about 22.5mm which is a little tight on the bolt carrier, so something in between should be about right. Obviously these aren't nominals, just what this scrap hunk happens to be.


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Posted: February 06 2010 at 6:03pm | IP Logged Quote dcorb

Boondoggle wrote:
A bit late for this discussion, but figured it would fit here.

I run a Coordinate Measuring Machine at work, so I took a piece of scrap demilled G3 receiver in to scan. This is the buttstock end I bought to salvage the sight mount and stock pin block. It fits snug but smooth into the buffer mount. The rails seem a bit wide. At the cutoff end they are about 22.5mm which is a little tight on the bolt carrier, so something in between should be about right. Obviously these aren't nominals, just what this scrap hunk happens to be.



This will be helpful!

I never heard of a Coordinate Measuring Machine and had to go look it up.

Coordinate Measuring Machine
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Posted: February 06 2010 at 9:52pm | IP Logged Quote blurrededge

Neat! I always knew there had to be some sort of machine that could scan a piece and give you dimensions.

What are the units on that diagram?

Another thought I had was, a slightly smaller or larger pipe Could be used, and adjusted when it was cut to join with the cocking tube pipe, which could also be adjusted in the same way. It may not be precision, but if done right it should work well enough.
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Posted: February 06 2010 at 10:38pm | IP Logged Quote Boondoggle

I did the units in millimeters, thinking that's what it was probably designed in, but nothing came out in a nice round number. Just divide by 25.4 to get good old inches.
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Posted: February 06 2010 at 11:11pm | IP Logged Quote Boondoggle

blurrededge wrote:


Another thought I had was, a slightly smaller or larger pipe Could be used, and adjusted when it was cut to join with the cocking tube pipe.


I think 1" tube squished a bit smaller, and 1.625" tube stretched out a bit would be about the closest off the shelf tube. 4130 is available in both diameters with .049" wall, which is close to the factory thickness. Mild steel comes in .065" wall for the larger tube, which may be a little snug for the bolt carrier.

http://www.onlinemetals.com/merchant.cfm?id=250&step=2&top_c at=197
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Posted: February 26 2010 at 12:55am | IP Logged Quote blurrededge

Recently I had to cut a ring of tubing for my Sten build. When I cut the tubing ring with a thin hacksaw blade, it sprung apart as though it had been under constant tension. I didn't think to measure how far apart it had opened up (subtracting the thickness of the material removed from the blade cut), but I will try it again and take a measurement. It didn't open much, but it would probably be enough to make a piece of tube that's just too small for the trunnion or carrier to fit, just the right size... depending on the size of the tube and wall thickness probably. Maybe I'll order a bunch of inch long segements of various sizes to see what would work. I need to order some metal soon anyway.
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