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eMGunslinger

Lewis Gun Problems

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I have a 303 Lewis Gun that is just driving me crazy. Got it back in October and attempted to shoot it. Set the spring weight from 8-15LB using a scale and it made no changes. Gun would fire 1-2 rounds and short stroke, on high speed footage the pan doesn't spin clockwise all the way so then it backfeeds and leaves a round partially out of the pan. Total pain in the ass to get unstuck. So I put the gun up for awhile while I inspected parts and got different ammo. In the meantime I noticed the gun was on the smaller gas setting and figured this was the problem.

Today I went to the range with it on the large gas setting, set the main spring to 14LB and progressively worked my way down to about 9LB. High speed camera again the carrier reciprocates back within about 1/2" of making a full stroke then the carrier goes forward where it gets stuck about 2" before going to battery on an empty.

Even putting 1 round in the feed tray and pulling the trigger rapidly yields the same results 

Things I have tried

*Different gas settings
*Different ammo
*Checked the feed mech it all appears in order the drum feeds at it should and the pawls are grabbing correctly
*Took the gun apart and the radiator out, the gas block is on the barrel very tight so I do not feel there is any leakage there.
*Action is smooth as can be, do not observe any dragging or anything parasitic that could cause an energy loss

Things I have not tried 
*Different pan
*Different carrier/OP rod

I have noticed the *Nozzle or Gas Chamber Gland* that screws on the end of the barrel its threaded almost like there is supposed to be a booster on it for more backpressure? Am I missing something here, because at this point either I am or there is some magic rain dance I am not doing right to get this thing working lol.

I have video of it shooting if it will help anyone help me out with this bastard child.

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I can offer a few suggestions.  The front end of the op rod can be a major source of gas leakage, as it gets the major blast of gas and most of the old ammo was very corrosive.

If you go over to www.machinegunboards.com you will find a forum dedicated to the Lewis and Bren guns.  There are a few very helpful guys there that are intimate with the Lewis who can probably help you out.

The threads in the "nozzle" are for a blank firing adapter and have nothing to do with operation with regular ammo.

Bob Naess at Black River Militaria in Vermont is very knowledgeable about Lewis Guns and other old time guns so if the guys over at machinegun boards can't help, he might be able to.

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Posted it there as well last night,  Bob confirmed some of my thoughts on it as well so I’m gonna look hard at the pistons and gas system in general.

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Yeah, I saw that a little after I posted here.  Good luck with your Lewis.

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