French MAS question

hockeysew · September 19, 2008, 12:16 AM

Hey all!
I had a customer bring in a MAS49 that was so thoughfully "Rechambered" by the beavers @ Century in 7.62x51.
Needs it reliable and is sick of it ripping off case heads.
Standard fare for the MAS.
I am going to polish the chamber and replace the extractor plus spring load and dress the end of the firing pin as SOP.
In doing a bit of research it seems that we have an overpressure situation. Century shortened the barrels about 2 inches which throws off the gas system timing.
So I was able to find 2 cures:
1-Splice in about a 1" section of AR gas tube into the existing gas tube to act as a restrictor.
2- Drill and tap the gas block to take a small allen head set screw for an adjustable gas system.

Personally I like option #2. The million dollar question is:
Who here has done this and where exactly do you drill the gas block?
A picture would be worth a thousand words.

Any other ideas?

September 19, 2008, 12:16 AM	#1
hockeysew Member Join Date: August 21, 2008 Posts: 91	French MAS question Hey all! I had a customer bring in a MAS49 that was so thoughfully "Rechambered" by the beavers @ Century in 7.62x51. Needs it reliable and is sick of it ripping off case heads. Standard fare for the MAS. I am going to polish the chamber and replace the extractor plus spring load and dress the end of the firing pin as SOP. In doing a bit of research it seems that we have an overpressure situation. Century shortened the barrels about 2 inches which throws off the gas system timing. So I was able to find 2 cures: 1-Splice in about a 1" section of AR gas tube into the existing gas tube to act as a restrictor. 2- Drill and tap the gas block to take a small allen head set screw for an adjustable gas system. Personally I like option #2. The million dollar question is: Who here has done this and where exactly do you drill the gas block? A picture would be worth a thousand words. Any other ideas?