Fn Fal, failure to extract

[reddogm1]

I have a FAlL with a new 18" barrel . I did not cut down the barrel, I got the barrel from SARCO, The barrel has markings of "R" and "O.G.".

It is built on a IMBEL rec.

The gas plus is set for "A" (top) ( not for grenade operation).

I have tried all the gas settings( 2 thur 7), There is no difference in the bolt movement in any of the gas settings.

The piston moves freely, the piston is new from Tapco with a new spring from Tapco. The piston (with no spring on drops free into the rec when held upright.

The butt stock recoil spring is new, the bolt /carrier moves freely.

The mag drops free and the bolt is locked back properly when the bolt is retracted.

The round in chamberd properly from the mag. The first round fires, but the bolt /carrier only moves to the rear about 1 inch and the round is not extracted .
I hope this is new information helps.

Reddogm1

[Rapidrob]

I'd check the following:
How tightly does the piston fit the gas tube? Are the piston and tube new?
If the piston looks good, the gas tube may be a fault. Common problem.
You say the piston moves freely. Have you pulled the recoil spring off of the piston, bolt assy out, point the muzzle up towards the ceiling. Does the piston move through front of the receiver with out striking it?, All the way?
Cut down barrel? New made? gas hole the right size?
Gas plug tight? Cracked gas regulator ring? We need more info.

[1811GNR]

Gas plug in the right way? (Not set for grenade)

[jim23460]

I had a problem like that and when i fired the rifle I found that the bolt was being over powered and the bolt was moving full stroke and bouning back about an inch. Lowered my gas setting way down and gotit to run on 2.

[Mosin Guy]

http://www.falfiles.com/forums/showthread.php?postid=928279#post928279

[johnny.308]

You shortened the barrel to 18". Did you open up (drill out) the gas port to a larger size? With the shorter barrel you are probably not getting enough gas pressure to do the job.