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Winchester Model 1903 and Model 63--

3060 Views 69 Replies 5 Participants Last post by  JBelk
I just had one of my Model 63s out to take pictures on another forum and figured a new thread should grow before the big pruner comes along.

This is a Miroku-made Model 63 I bought in Y2K in Colorado in a pawn shop. (part of a great gun deal)
The fit and finish is actually better than original Winchesters mainly due to the polishing process. Winchester used wooden wheels covered in leather in their side polish machines. The Japanese are precision grinding with much better tools. The internals are different. I'll photo the '03, 63 and Japanese 63 side by side to show the internal differences.

It used to be '03s were really inexpensive due to ammo shortage, but that was cured years ago and 22 Win. Auto ammo is sometimes available with LR isn't!
The Model '03 is the world's first successful 22 rimfire semi-auto. Since Long Rifle ammo was loaded with most anything in 1900, including black powder, it took special ammo made for the specific gun to operate reliably.

The pictures shows the Model 63 on top and '03 on the bottom. The only real difference beyond dimensions of the magazine tube is the shell stop. The M63 uses a heavy stamped part while the '03 has a milled part of lower profile.

Seldom can one model last a hundred years without major changes.

Show your guns and tell your stories of one of the world's great guns.

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Im

I’m stumped and getting ready to throw the towel. I installed the model 1903 inner and outer magazine tube. The buttstock won’t fit the tube although it’s a 1903 stock… the receiver and the bottom half of the rifle will not couple together. It looks like the hammer hits the carrier bolt.
I take that back!! I got the rifle to snap back on together. But there’s no way this inside magazine fits in this stock. At least I got the gun to feed fire and extract now. I had to cock the gun in order to get it to go back together. I don’t remember having to do this before though??
I take that back!! I got the rifle to snap back on together. But there’s no way this inside magazine fits in this stock. At least I got the gun to feed fire and extract now. I had to cock the gun in order to get it to go back together. I don’t remember having to do this before though??
I guess I could drill out the stock a little bit to make the 1903 magazine to fit?? I’m confused isn’t this a 1903 stock? Why does the 63 tube fit but not the 03?
You're fighting an uphill battle. Either somebody lost a bunch of parts or has tried to convert an '03 to a '63 and has scrambled parts.
It is very common for new models to go through several changed before all the processes get squared away. Yours is an early gun and without a stash of parts to try, is a tough puzzle.
The mag tube too big is not a problem if it's just the collar as shown...that's 30 seconds on the lathe to cure, but the rest of the tube could be different too.
The receiver fit is another problem. Without being able to turn it and examine it, I can't guess.
The gunsmith's protocol is to go to basics-- Fit one part at a time after understanding what the part does and how it operates and what else it might operate. Remember it's all a chain of links. A chipped sear affects hammer position is just one example.
I have a 91xxx Model '03 if you need measurements or pictures.
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You're fighting an uphill battle. Either somebody lost a bunch of parts or has tried to convert an '03 to a '63 and has scrambled parts.
It is very common for new models to go through several changed before all the processes get squared away. Yours is an early gun and without a stash of parts to try, is a tough puzzle.
The mag tube too big is not a problem if it's just the collar as shown...that's 30 seconds on the lathe to cure, but the rest of the tube could be different too.
The receiver fit is another problem. Without being able to turn it and examine it, I can't guess.
The gunsmith's protocol is to go to basics-- Fit one part at a time after understanding what the part does and how it operates and what else it might operate. Remember it's all a chain of links. A chipped sear affects hammer position is just one example.
I have a 91xxx Model '03 if you need measurements or pictures.
Thank you! Mechanically the gun is good now. I Can feed and extract fine now. I’ll have to wait to fit the stock on to see if it can do it on its own now. I’ll give update. I might have to take a small dremel and make the stock hole a bit bigger.
That stock hole is likely undersized the whole way. Do some measuring before cutting anything. That large section has to fit the recess at the butt end. LOOK CLOSE. Isn't the end of the mag tube threaded and that's the collar that holds it to the stock?
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That stock hole is likely undersized the whole way. Do some measuring before cutting anything. That large section has to fit the recess at the butt end. LOOK CLOSE. Isn't the end of the mag tube threaded and that's the collar that holds it to the stock?
Yep, apparently the 03 and 63 have the same thread on the butt of the magazine tube.
Remove the collar and the tube will fit through the stock. The collar is a nut that hold the stock on.
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Remove the collar and the tube will fit through the stock. The collar is a nut that hold the stock on.
I did remove it. I just put the nut on to see if it would fit the new tube. Could you please do me a huge favor and tell me the dimensions of your stock hole? And also I cannot for the life of me get this thing to fit the other way around like we talked about. I took it to the range today and it shoot and fired perfect. I found a new stock for cheap.

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My 1903 stock hole is just over 5/8" (.635). The swell at the loading port is .625 and the swell going into the receiver is .630". It's a slurp fit.

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My 1903 stock hole is just over 5/8" (.635). The swell at the loading port is .625 and the swell going into the receiver is .630". It's a slurp fit.
Would you say this isn’t a factory 1903 stock?

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I'll go take apart a M63 to be sure, but It appears by the size to be a M63 with the pistol grip cut off. Show a picture of the entire stock to be sure.
M1903 is straight grip with a crescent butt. M63 has a rather tight pistol grip and slightly concave butt.
I'll go take apart a M63 to be sure, but It appears by the size to be a M63 with the pistol grip cut off. Show a picture of the entire stock to be sure.
M1903 is straight grip with a crescent butt. M63 has a rather tight pistol grip and slightly concave butt.
Holy sh*t i never thought about that! That makes a lot of sense now.

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Measure from the tip of the toe to the action end of the stock. The M03 is 13 3/4" . The Model 63 is 13 even. You might want to compare lengths of the mag tube with the stock, too. The original '03 stock is longer than the M63.
Measure from the tip of the toe to the action end of the stock. The M03 is 13 3/4" . The Model 63 is 13 even. You might want to compare lengths of the mag tube with the stock, too. The original '03 stock is longer than the M63.
This is so confusing. Then why does the 1903 tube not slide in here but the middle 63 tube do?

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Let's go back to the beginning and inventory the parts and where they came from. Are you calling it a Model 1903 because that's what (the replaceable) barrel says? What caliber is it 'really'? Does the original mag tube fit 22 LR or 22WinAuto?
Could a rare transitional M63 have made it out of the plant camouflaged as a M03?
Let's inventory what you have and how it came to you, first.
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Let's go back to the beginning and inventory the parts and where they came from. Are you calling it a Model 1903 because that's what (the replaceable) barrel says? What caliber is it 'really'? Does the original mag tube fit 22 LR or 22WinAuto?
Could a rare transitional M63 have made it out of the plant camouflaged as a M03?
Let's inventory what you have and how it came to you, first.
So I purchased this rifle from a gentleman that lives in another state. He happened to live 15 mins away from my buddys gunshop where he also shipped the gun through. I told my buddy to check it out the condition and tell me how it looked in person. He said it looked minty and I said alright let’s go ahead and do the deal, by the way the rifle also came with 950 round of águila .22 automatic ammo. When I get the rifle I tried to take the gun apart to see the inside and clean it for myself. I tried to chamber one of the rounds through the buttstock but it just wouldn’t no matter what. I could manually fit a round inside the chamber, and I could extract it by pushing the cocking plunger down again. So I didn’t more investigating and found out that the gun had a model 63 putter and inner magazine tube. So I went and replaced those with a model 03. Now it fires perfect and mechanically works fine. The problem I’m having now is that the stock won’t fit. I will mention this is a very early production rifle, serial # is 7939. This is the way it sits at the moment. Another thing is I don’t see a “WP” mark on it. Is this a Chinese version? The original mag chambers .22 LR but the Martel fits .22 auto.

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Use those calipers on the enlarged loading section and the upper section above the braze on both the magazine tubes you have One should be .625 and the other .600. Confirm that a 22 auto cartridge will not fit in the smaller tube.

I would not call that gun 'minty' in any circumstance. It's a badly buffed and re-blued gun that must have been really rusted out just behind the trigger guard. The buffer ate into the safety spring tunnel. Did the gunsmith not test fire it as part of his inspection?

Can you remove the cartridge stop and tell me what cartridge fits 'backwards' down the mag tube?

I've seen two Model 63 with lower-outer mag tubes broken from the upper and badly repaired. Yours may have had the wrong lower attached as part of the re-blue-repair. Thats' all I can figure now.
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Use those calipers on the enlarged loading section and the upper section above the braze on both the magazine tubes you have One should be .625 and the other .600. Confirm that a 22 auto cartridge will not fit in the smaller tube.

I would not call that gun 'minty' in any circumstance. It's a badly buffed and re-blued gun that must have been really rusted out just behind the trigger guard. The buffer ate into the safety spring tunnel. Did the gunsmith not test fire it as part of his inspection?

Can you remove the cartridge stop and tell me what cartridge fits 'backwards' down the mag tube?

I've seen two Model 63 with lower-outer mag tubes broken from the upper and badly repaired. Yours may have had the wrong lower attached as part of the re-blue-repair. Thats' all I can figure now.
Yeah I can confirm that a .22 auto will not fit inside the smaller tube. But a .22 LR will fit in it. The new tube will fit a .22 auto and that’s what I put on the rifle now. I’m gonna risk it and buy a genuine 03 stock and try to fit it on. Idk wth this stock goes to…. A 63 but just no pistol grip?
Use those calipers on the enlarged loading section and the upper section above the braze on both the magazine tubes you have One should be .625 and the other .600. Confirm that a 22 auto cartridge will not fit in the smaller tube.

I would not call that gun 'minty' in any circumstance. It's a badly buffed and re-blued gun that must have been really rusted out just behind the trigger guard. The buffer ate into the safety spring tunnel. Did the gunsmith not test fire it as part of his inspection?

Can you remove the cartridge stop and tell me what cartridge fits 'backwards' down the mag tube?

I've seen two Model 63 with lower-outer mag tubes broken from the upper and badly repaired. Yours may have had the wrong lower attached as part of the re-blue-repair. Thats' all I can figure now.
WTF!! I got the stock to sit inside the new tube. I had to tap it really hard but it’s on there finally!!!!
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According to my 1915 M'03 and 1946 M63, the mag tubes are the same outside dimensions. The M '03 has a thinner tube for the .390 inner diameter than the .357" dia of the M63.
Here's a great example of manufacturing simplification to lessen expenses.

The Model 1903 at top has two machining steps to cut the slot and dovetail it in three machining steps involving two machines and then the seperate stamped part has to be installed and peened in place.

The Model 63 at bottom has one machining step and a tap with a hammer to do the same thing.

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