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-   -   Cetme Info (http://www.firearmstalk.com/forums/f25/cetme-info-76185/)

drewk256 11-12-2012 01:32 AM

Cetme Info
 
I traded for a Century Cetme and after test firing it I was getting some gas blow back coming back on the casings after it fired and I was also not cycling just right. So thinking it just needs a real good cleaning. I broke the gun down and started with my cleaner. Noticed that my rag was turning black. After looking at the issue further it seems that it has been painted. Just wondering if any one else has had this problem and what the best thing to fix it.

robocop10mm 11-12-2012 08:57 PM

You first need to understand the operating system. The CETME uses a roller locked delayed blowback operation. It is unlike most other systems. The chamber is fluted to allow hot gasses to blow back along the flutes. This allows the case to float on a cushion of high pressure gasses. This keeps the case from sticking in the chamber. The bolt does not rotate. The round goes straight in and out of the chamber.

Keep in mind this rifle is NOT chambered in .308. It is 7.62 X 51 NATO. .308 ammo will not work properly in the gun. The brass is too thin and will eventually give you separated cases. Get a stuck case puller, you will eventually need one. They are simple, inexpensive and easy to use.

You need to get familiar with some things like "bolt gap", "false gap", "ground bolt" and the "HK slap".

They are not headspaced like most rifles. The bolt gap is measured and can be adjusted with oversize rollers, locking pieces and bolts.

The Monkeys at Century really messed up some builds and did OK on most. Before you get too far into it, you need to know what you are dealing with. We don't normally do this, but I am going to refer you to the CETME specialists at militaryfirearm.com. They have numerous "stickies" that will help you understand the magnitude of your problems. Or, help you understand how to fix a minimal problem.

As far as the finish, it is possible someone simply spray painted the gun. The typical finish is an epoxy paint that should not come off unless you are using some ssort of industrial solvent. If the gun is salvagable, I would consider parkerizing, top coated with Duracoat or Ceracote for a durable finish.

drewk256 11-12-2012 11:14 PM

Thanks for the help. I have looked into the duracoat and the business that does it also does gun smith work. I cleaned it real good so I'm going to do some more test firing to see if my ejection issue continues. But thanks for the info.

jt41time 02-14-2013 05:00 AM

Did they make a sportier that is in .308? I have shot probably about 3000 rds through mine and no I'll effects. Besides the cases being dented like crazy(prob a bolt spacing problem) i m about to start a ptr build of my CA banned cetme, and this type of info is a good thing when I have to buy 51mm cases or .308......

robocop10mm 02-14-2013 12:09 PM

Even though the HK/CETME rifle were stamped .308 they are NOT .308, The fluted chamber noes not mix welll with this, soft commercial braass. Some have ZERO problems wth theirs, but they are just lucky.


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