Grasshopper Posted July 24, 2021 Report Share Posted July 24, 2021 Hi All, I was out at the range today turning money into noise with the Bren. It is a 1940 JI gun. I've the gas regulator set on the smallest dot. From time to time it would double in semi. Could this be caused by under-gassing the gun? In short, how do you know you have the gas setting correct. I don't have any ejection problems with the smallest dot setting. Just some run-on in semi. Thoughts? Thanks, Grasshopper Link to comment Share on other sites More sharing options...
Japlmg Posted August 18, 2021 Report Share Posted August 18, 2021 If the gun is under gassed, it will not drive the op rod far enough back to catch on the trigger sear, but far enough back to extract, eject and chamber a fresh cartridge.Either the gun is dirty, or the gas piston/gas cylinder fit has excessive clearance. Turning the gas adjustment to the next larger port, will normally correct the issue. But, do check the clearance between the gas piston and the gas cylinder.They are often worn, creating excess clearance. Link to comment Share on other sites More sharing options...
BPinFL Posted August 27, 2021 Report Share Posted August 27, 2021 what ammo were you shooting? it might be some of the problem.Do agree with Japlmg's analysis. Turn up the gas! Link to comment Share on other sites More sharing options...
MGMike Posted January 28, 2022 Report Share Posted January 28, 2022 Set it to the second dot and forget it. M Link to comment Share on other sites More sharing options...
klocker Posted February 7, 2022 Report Share Posted February 7, 2022 I am on the 3rd out of 4 gas setting and this works very well. I use post war surplus ammo. Last shootout, about 5 mags shot, 0 issues. Link to comment Share on other sites More sharing options...
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