Bad gas block

frtyfivsevnty · October 31, 2005, 17:31

I have a metric Fal put together from spare parts.After about 2-3 rounds the gas tube blows out of the gas block.I put a different tube in it but haven't had the chance to fire it yet.If the problem persists is there a fix other than replacing the gas block?

gunsmith_tony · October 31, 2005, 18:23

If the new tube no work either, you can always solder and cut the tube.

M&M Gunsmithing

BlackCat · October 31, 2005, 18:28

Do what the smith I sent one of mine to did, if you're a flaming halfass- drill the gas port WAY the hell open and pray for the best.

I'm sure you know you're better off just sucking it up and replacing it.

frtyfivsevnty · October 31, 2005, 18:37

The soldering idea is an option.I have to get some more solder paste anyway.

gunsmith_tony · October 31, 2005, 21:40

As a general rule, one should check everything else before opening the gas port.
Of all the "problem" FALs sent to me by customers believing their ports needed opening...probably 80% were found to have other issues not related to port size.
I've also noticed that some of the new gas tubes seem to have problems related to the thread profile. i.e...threads not cut to full depth. If one does manage to fully install it into the gas block, the inner diameter at the threaded end reduces slightly in size causing the piston to bind. Or in a few cases seize. I've had to finish cut the threads in a few, and ream a few others.
Many also seem to believe chopping a couple of inches off the barrel necessitates opening the port. Not always the case.

M&M Gunsmithing

**Stoney** · October 31, 2005, 21:54

Tony
The first barrel I cut down, I opened the gas hole up to much and it blow every tube I put in it, you're right, don't open them unless you have to. It was .125 and that's way to much.

October 31, 2005, 17:31	#1
frtyfivsevnty Registered FALaholic #: 6367 Join Date: May 2002 Location: ny Posts: 2,250	Bad gas block I have a metric Fal put together from spare parts.After about 2-3 rounds the gas tube blows out of the gas block.I put a different tube in it but haven't had the chance to fire it yet.If the problem persists is there a fix other than replacing the gas block? __________________ "I'd like to buy your deadliest gun please."-Homer Simpson

October 31, 2005, 18:28	#3
BlackCat Registered FALaholic #: 1677 Join Date: Nov 2000 Location: Fort Rucker Posts: 800	Do what the smith I sent one of mine to did, if you're a flaming halfass- drill the gas port WAY the hell open and pray for the best. I'm sure you know you're better off just sucking it up and replacing it. __________________ "They don't rule the night. Nobody does. They don't have the strength of ten men....Sometimes they'll go wild, start coming right at you. You'll be screaming 'No, no, no' and all they hear is 'Who wants cake?' They all want cake."

October 31, 2005, 18:37	#4
frtyfivsevnty Registered FALaholic #: 6367 Join Date: May 2002 Location: ny Posts: 2,250	The soldering idea is an option.I have to get some more solder paste anyway. __________________ "I'd like to buy your deadliest gun please."-Homer Simpson

October 31, 2005, 21:54	#6
Stoney Former 0311 Contributor Bronze Contributor FALaholic #: 1205 Join Date: Oct 2000 Location: Brush Prairie, WA USA Posts: 3,331	Tony The first barrel I cut down, I opened the gas hole up to much and it blow every tube I put in it, you're right, don't open them unless you have to. It was .125 and that's way to much. __________________ Stoney Bureaucracy,, taking the fun out of life one stupid rule at a time,,,, Old Viking saying: Never be more then two steps from your weapon Don't pick a fight with an old man. If he is too old to fight, he'll just kill you. Peace is that brief glorious moment in history when everybody stands around reloading. - Thomas Jefferson

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October 31, 2005, 18:23	#2
gunsmith_tony Registered FALaholic #: 6564 Join Date: May 2002 Location: Atlanta, GA Posts: 2,521	If the new tube no work either, you can always solder and cut the tube. M&M Gunsmithing

October 31, 2005, 21:40	#5
gunsmith_tony Registered FALaholic #: 6564 Join Date: May 2002 Location: Atlanta, GA Posts: 2,521	As a general rule, one should check everything else before opening the gas port. Of all the "problem" FALs sent to me by customers believing their ports needed opening...probably 80% were found to have other issues not related to port size. I've also noticed that some of the new gas tubes seem to have problems related to the thread profile. i.e...threads not cut to full depth. If one does manage to fully install it into the gas block, the inner diameter at the threaded end reduces slightly in size causing the piston to bind. Or in a few cases seize. I've had to finish cut the threads in a few, and ream a few others. Many also seem to believe chopping a couple of inches off the barrel necessitates opening the port. Not always the case. M&M Gunsmithing