A few questions from a newbie....(well sort of)

[CETME .308]

OK guys just a few questions.

First of all, I keep hearing about flutes.
I am anal about field stripping my CETME after every day at the range, and scrub the bolt, lokcing piece, fireing pin and spring, as well as oil them.
I also clean the barrel with patches and Hopper's No. 9.

Now where are the flutes located?
I pulled out the long cylindrical piece the bolt connects to, and looked in the long (top) part, and seen what appears to be flutes, so I scrubbed that with patches and Hoppers.

Was I correct, are these the flutes?

Second.....does anyone have an exploded view of a CETME describing parts such as carrier bolt, trunion, A-Frame, etc.

I am new to this and still trying to figure out the specific parts.

Thrid- The trigger pack- How do I clean the inside? Spray cleaner in it and let it soak the powder residue away, then re-oil?

Thanks for all your help!!

[texlurch]

The flutes are in the chamber of the barrel, where the shell sits. Look at an ejected case and you should see dark lines down the sides.

Best cleaned with a 45 cal wire brush, lots of elbow grease.

[LorDiego]

The flutes are in the chamber of the barrel, where the shell sits. Look at an ejected case and you should see dark lines down the sides.

Best cleaned with a 45 cal wire brush, lots of elbow grease.

OMFG!! Im such a doosh! I thought the flutes where the other...

nevermind..

live and learn something new at MilitryFirearm.com everyday! :)

[CETME .308]

Thank You Tex!

[A.D.A.]

Try this :

http://cetme.homestead.com/

It should help you in your understanding of the trigger pack and the major assemblies of the rifle. Hope it helps and good luck.

[MasterGunner]

The reason why the CETME/G3-series use a fluted chamber comes from the manner in which they operate.

Both CETME/G3-series rifles use a roller locking design. Because they do, they do not provide adequate primary extraction for the fired brass. What this means is that the bolt begins to move back before the brass cartridge case has had a chance to "shrink" back to a size after firing that will allow extraction and ejection without sticking in the chamber.

There are two ways to prevent the CETME/G3 extractor from ripping the case head off.

First, libricate the brass with oil or grease. Not a good idea for a combat weapon where dirt and sand are about.

Second, flute the barrel's chamber so that the end of the cartridge case is floated on propellant gases. This keeps the case from sticking in the chamber. The down side is that the cases are extracted very violently (but positively) and get dented by the ejection port.

This is a very common operating principle in small arms (fluting chambers, that is). The SVT-40 Tokarev rifle in 7.62x54R uses a fluted chamber. The Mk 10 20x110RB Oerlikon AA gun of WW2 uses greased cases instead of a fluted chamber. The AN/M3 (or M24 or Mk 16 Mod 5) 20x110 aircraft cannon used lubricated cases along with a fluted chamber.

The best way to assure flawless operation of the CETME/G3 series is to keep the chambers and flutes squeaky clean.

:g3:

[jettag]

Far better to ask and learn than to assume and well....