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Discussion Starter #1
I am not sure if this is in the right place since technically the G3 is a CETME copy. LOL.

A few questions about these. First, is the G3 barrel compatible with the CETME? Any before or after parts compatibility issues I should know about?

Second, what is involved in changing the barrels out, or more precisely, installing them new?

3rd, what are the better barrels, and what should I stay away from?

4th, other than just smoothing out machine marks, is it wise to customize and/or chrome plate any of the innerds and if so, do you recommend any particular services?

Thanks folks.
 

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The barrels have different diameters where the triple tree mounts. So either swap triple trees or see about turning them to correct diameter. The trigger packs are swappable between platforms but the parts are generrally not swappable between lowers.
There are more 922 parts for a G3 lower than a CETME and you have options to upgrade the performance you do not have with a CETME. G3 is better all around.
Buttstocks and backplates, you can get an HK backlplate assembly to interchange with a CETME if you use a cetme guide ring and end stop (sorry but proper term eluding me). The parts are not interchangeable between stock assemblies other than that.

2nd, pressing barrels. There are builder forums that can detail this. In a nutshell, drive out barrel pin, press barrel out of trunnion from rear to front using a press. Drop new barrel into trunnion, press most of way but short of flush, use your bolt carrier in the trunnion with an appropriate gap spacer between bolt and carrier and use press to press bolt carrier barrel to desired gap. SWEAR A LOT!!!, Then swear some more. This is point you want to read an actual tutorial to see the fine details. After desired gap achieved drill through the barrel pin hole of your trunnion and press your new barrel pin in place to hold the barrel at desired gap.

4th- I would say no on the chroming. You would be changing the tolerances on you parts and it could create issues.
 

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The barrel choice depends on what you want the rifle to do for you. If you want a cheap barrel in the white then Sarco is about the cheapest. If you want a higher quality with a finish then it's RCM. For a target quality rifle the price starts around $450 to $500 (MOAXP) and goes up along with the price of everything else needed to make it work.

Ive never run into fitment issues between HK and Cetme barrels, maybe current suppliers are doing stuff differently now.

Rebarreling is a more complicated than doing it on a new build with the trunnion out of the receiver. I had to modify my press a little but I was using longer barrels too.
 

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On par with what Holecreek is saying. I would inform you that the chroming issues for tolerances on certain parts will be an issue.

I've used a couple chrome plating shop's and spoke with many before working with 2 vendors for this service. I would only use one after all said and done. The Bolt Carrier stripped is doable but some work needs to be performed before plating.
Titanium nitride is something that I would love to have done' but the cost and shops with the technical savy to assist is still somewhat early. The bolt carrier and bolt head could be done with minimal work prior to Nitride.

Like others have mentioned the cocking tube and handguard also the sights
 

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Discussion Starter #7 (Edited)
Thanks fellas. Barrel wise I will probably go middle of the road. I am much more interested in multi-role than something heavily geared towards target shooting.

I don't know what buyer's definitions of great condition are but the CETME parts kit I got looks like it was built a little sloppy right out of the factory. Not unexpected from a military rifle and even somewhat hopeful given the gun apparently worked well in spite of it. So I am going to do a pretty thorough job of cleaning up the working parts. Nothing radical. Just make everything smoother and all. I've done this with several guns already. When I do this, I may loosen some necessary specs in order to make it ideal for chrome plating. But I haven't decided for sure yet.

New question for you folks. Without prejudice, in what ways is the G3 better than the CETME, and in what ways might the CETME have the upper hand. Basically, I am looking for the best balance between the two.
 

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The barrel choice depends on what you want the rifle to do for you. If you want a cheap barrel in the white then Sarco is about the cheapest. If you want a higher quality with a finish then it's RCM. For a target quality rifle the price starts around $450 to $500 (MOAXP) and goes up along with the price of everything else needed to make it work.

Ive never run into fitment issues between HK and Cetme barrels, maybe current suppliers are doing stuff differently now.

Rebarreling is a more complicated than doing it on a new build with the trunnion out of the receiver. I had to modify my press a little but I was using longer barrels too.
RCM has some high quality extremely accurate barrels made from Lothar Walther blanks. End to end runout is less than .005. Other then a hand lapped match barrel these are the best out there. IMO.
 

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New question for you folks. Without prejudice, in what ways is the G3 better than the CETME, and in what ways might the CETME have the upper hand. Basically, I am looking for the best balance between the two.
The difference is original vs. Modernized. Unless you're a builder you get what you pay for.


RCM has some high quality extremely accurate barrels made from Lothar Walther blanks. End to end runout is less than .005. Other then a hand lapped match barrel these are the best out there. IMO
Where can we get one? Is it more or less than the price range I stated?
 

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No one is making new Cetme parts. That means the run of the mill rifles (all CAI products) will have been made with used BCG's at the very least, with some other used parts tossed into the mix as needed. Typically CAI cetmes have been assembled by the lowest bidder and in yhe past bad decisions have been made with regard to holding the price point down. I can't speak to the recent C308's except for everything I've seen posted on the various forums. I will be receiving a C308 sometime (next week probably) that has given its current owner grief for awhile. It will be interesting to go through it and see how it was constructed and see what it takes to make it right.

PTR produces a US made copy of the HK91 with US made components that are interchangable with German made HK parts. They have had their ups and downs but are now regarded as a good quality HK clone. I have no experience with them since I build my own rifles.

Then you have the original HK rifles which are available for roughly 2-3 times the cost of a PTR. If there are problems you'd never hear about them. Just remember, HK hates you. I have an HK33 I built and its a fun gun to shoot.

Functionally Cetmes and HK are the same. Many parts are interchangable, including the trunnion (contrary to old data). The parts that are not interchangable are mechanically the same but the HK parts are slightly smaller. HKs (and by default PTR) have a better trigger pack, rear sight and buffer assy by far.

As a builder I have the luxury of using the best parts from both platforms or even making my own parts. Price point becomes irrelevant because my time is free (only build for myself). I have Cetmes in all flavors, from shorties to a very accurate target rifle. I use Cetme guts because of what I said above, mechanically equal (material, hardness, and machining tolerances) but very cheap in cost comparison.

If you're not a builder, buy a PTR or an HK unless you're mechanically inclined and like to tinker, in that case roll the dice and start with a C308.

None of the rifles mentioned above are very accurate (it sounds like PTR has a target rifle in their offering now though), they are battle rifles.
 

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Discussion Starter #12 (Edited)
I use to build guns for hobby, have scratch built thousands of working gun parts and I already have a CETME C parts kit from Apex shown below. That's why I asked about the best combination of parts for a service/all purpose rifle.

I will probably build most or all of my own furniture but I want to know what the best choices for innards combination is. Which; from the sound of things, probably means what are the ideal parts to swap out for HK parts.

FmWRupo.jpg
 

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Ditch the Cetme FCG (trigger box, it's components and safety lever) and replace them with HK parts. If you're shooting irons, loose the Cetme ferris wheel rear sight. For some reason many Cetme owners get HK envy and feel the need to "update" to an HK stock and buffer. They really aren't a perfect swap but can be made to work OK. Truth is if the rifle is set up right the carrier won't hit the buffer anyway.
 
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