Question about the two piece barrel

[1961bama]

[B]Does anyone know where i might find a dimensioned drawing on the two piece barrel, the one where barrel and gas cylinder are individual pieces?

Information

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[JackP]

This book has what you are looking for. Pages 25 thru 32 of the first book listed.

Carbine Info, Blueprints, Posters, Mouse Pads, Coffee Mugs

[Bruce McAskill]

I doubt you are going to find what your looking for. The information was never listed in the TM's as armors never would change a gas cylinder or the barrel part by themselves. Too many chances it would not take and would crack the gas cylinder and it was not time wise feasible. Much easier to just change the barrel with a new one.

[painter777]

There you go again Bruno,

[Bruce McAskill]

Look Oddball, I just wanted the guy to save himself some time, money as well as maybe some frustration. Remember Inland had the system to pin the cylinder on but dropped it as not being worth the it. Have to match the gas port hole in the used barrel with the hole from the gas post in the cylinder making sure the rifling match's up. If it doesn't then more problems occur. Hey I wish him the best as long as he knows the challenges he is facing.

[painter777]

[1961bama]

Thanks, I am not going to try and match up gas holes. I am making a barrel from a used 1903-A3 cut-off from an old drill rifle.I am concerned whether or not there is a small groove on the barrel under the outboard end of the gas cylinder. The gas cylinder I have has that edge rolled over. That by itself will not completely seal the gas train but will lock the cyl in place.

[JackP]

According to the drawing in the Nicolaus book there are grooves in the barrel both on the rear and forward ends of the gas cylinder. There is no indication that the gas cylinder is crimped into the rear groove. Perhaps it only serves to locate the rear surface of the gas cylinder. The detail in the drawing is not clear but it suggests there is also a short section of the barrel next to the forward groove that is of an unspecified larger diameter than the rest of the barrel . I believe this establishes the forward locating surface for the gas cylinder. The rear groove is .12 wide, the front groove is .18 wide and may be tapered to match the shape of the crimp. It looks like the cylinder is only crimped in the front.

[browningautorifle]

I am concerned whether or not there is a small groove on the barrel under the outboard end of the gas cylinder.

I had to put one of these together once about 25 years back. The gas cylinder slips over the barrel and crimps at the forward end into a groove like you think. It's not hard when you're assembling them, press fit. The ngas seal is accomplished because it's a TIGHT fit. Not a press fit you can do by hand. Then the forward end/edge of the gas cylinder is rolled into the groove to give you the round profile you'd expect.

[1961bama]

VERY big help. Thanks much!