Son of a Bubba: Official Guide for the Mosin Bubba Build Off

[engnerdan]

damn lazy capitalist pig dog - "easy"... there is no easy in mosin bubba build off.....

The easy part is buying 2 or 3 of these things.

[Stradawhovious]

Well, yesterday I bought my Mosin (a little behind now, but don't worry, I got this...)

It's a 1939 Izhevsk
Not to give too much away, but I have plans to convert it to left-handed...

Wouldn't it be easier to man up and shoot right handed

damn lazy capitalist pig dog - "easy"... there is no easy in mosin bubba build off.....

I don't know.... Getting tossed and cutting one in half with a sawzall was pretty easy.

[engnerdan]

So my friend Erin and I took out one of the three Mosins that reside with me right now for a little trial before dismemberment. Just for the record I could not ever get on the paper (2 foot tall 3 foot wide) at 100 yards with it. But I can hit a IDPA target with my limited pistol at 100 yards, go figure.

Erin Shooting

100 Yards - 1 foot right 1.5 foot high (sight at 0)
200 yards - 2 foot right 1 foot high (sight still at 0)
300 yards - 2.5-3 foot right 1 foot high (unsure of the sight adjustment on the rear) - I started in with the punch and hammer on the front sight.
400 yards - 1 foot high and 1 foot left (over did the sight adjustment)

[Lunchbox]

Any word from karkov?

I got to thinking... Yes it hurt, shut up... Given the fact it seems like the vast majority of us got our mosins from BP FF, you should hit them up for sponsorship.

[engnerdan]

I spread my FF purchases around,Circle Pines, Brooklyn Park, Lakeville.

Maybe out member from the Hundra Arms can work something out for us.

[Shipyard]

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door is open to anyone else who wants in on this idiocy...

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that is all Komrade.

[Anokamnman]

Well after much anticipation... I finally purchased the barrel for Olga. It arrived today. I got home and saw a big box on my front step from Midway. I was like a kid on christmas morning. So this thing is 22" long and is 1.250" diameter. Kind of digging the idea of a 45-70 Bull barrel. lol. Not sure what I will wnd up doing for a barrel profile. I will figure out something cool. Will be updating Olga's Surgery thread as I complete more of the steps. Will be heading to the shop tomorrow to make my own rails on the bridgeport. That will save me $10. I love being a resourceful redneck.

[engnerdan]

Well after much anticipation... I finally purchased the barrel for Olga. It arrived today. I got home and saw a big box on my front step from Midway. I was like a kid on christmas morning. So this thing is 22" long and is 1.250" diameter. Kind of digging the idea of a 45-70 Bull barrel. lol. Not sure what I will wnd up doing for a barrel profile. I will figure out something cool. Will be updating Olga's Surgery thread as I complete more of the steps. Will be heading to the shop tomorrow to make my own rails on the bridgeport. That will save me $10. I love being a resourceful redneck.

I am planning on 1.2" bull barrel on my "Mother Bubba" it just looks too damn awesome.

If you have not separated the barrel from the action I did make an action wrench for the round actions you are welcome to try. I also made a barrel vise, you would need to make your own bushings for it but you are welcome to use it for a short while if needed. I wish you luck. I had 2 come apart with a good amount of effort and one twisted the barrel clean off and I still have not got the old barrel out of the action. Off to mill it out now.

[Lunchbox]

I was looking at my receiver the other night, as I was cooking my stock, it doesn't look like an easy project to get that barrel out.

[Anokamnman]

i will chuck it onto a lathe. use a parting tool on the barrel where it meets with the reciever. only cutting in about .100 as a relief cut. then it should be pretty easy. might have to take you up on your offer dan

[timwarner]

We should assemble a tool list of who has what, so we can maybe work together days for people to get together and drink.

And maybe fumble around with whatever we were using.

I have plenty of mills for use on weekends in NW suburbs. A couple lathes, though they all only have 3 or 4 jaw chucks, not bushings. Not so good for threading.
2 of the mills have digital readouts, so any milling work is real easy.
It's available for anyone who needs, as time permits.

We also have a wire and stick welder(I can weld stuff, but it won't look nice), and a hydraulic press(not sure what we could use this for, but I believe it's 350 tons)

My shop has a lot of bar stock, as long as we're only making small parts, the use of material wouldn't be a problem, and a few surface grinders. (I was thinking of making my own trigger, ground to fit, or maybe doing bushings like that other guy)
I could whip up a barrel vise/action wrench in few minutes I think, but I believe other people already have them available.

My skillset is not of a huge use to building a mosin. Basic machining and turning. I've made a few compensators.
But I'm going to bubba the hell out of what I have.
I do have a fairly large variety of drills, mills, taps, countersinks, and counterbores though.

Shippy isn't allowed in the doors without at least a 6 pack of PBR.

[engnerdan]

i will chuck it onto a lathe. use a parting tool on the barrel where it meets with the reciever. only cutting in about .100 as a relief cut. then it should be pretty easy. might have to take you up on your offer dan

I wish you better luck then I had tonight. That does help in most cases. I have the "SOB" right now that I have no pressure, just a threaded stub in the receiver and it still will not move.

The pictures below are officially of the SOB Mosin.

This is after the 3rd time it broke free of a weld, well this time it twisted off the barrel



Here is after it tore a chunk out of the piece it was welded to

[FJ540]

Dan, have you heated the barrel up yet?

Getting it glowing does two things - it makes it grow, which crushes the rust and whatever thread locker they used. And then when the metal cools again it shrinks from its original size, making it a looser fit in the hole.

I'd put a rose bud on what's left of the barrel and get it dull red a couple times, then let it air cool (you'd end up hardening the receiver if you quenched it and might warp it as well), then come back in a couple hours and give it a tug.


As for the contest and assisting others - I'm not allowed to wash my right hand for 20 days and then potentially will have the other hand cut into a week after that. However, I am relatively wide open schedule wise to assist/instruct in other people's house or shop assuming I'm not too doped up to drive. For instance, if Tim had a group up to the business, I could keep a machine or two supervised to increase the productivity of the event.

[engnerdan]

Dan, have you heated the barrel up yet?

Getting it glowing does two things - it makes it grow, which crushes the rust and whatever thread locker they used. And then when the metal cools again it shrinks from its original size, making it a looser fit in the hole.

I'd put a rose bud on what's left of the barrel and get it dull red a couple times, then let it air cool (you'd end up hardening the receiver if you quenched it and might warp it as well), then come back in a couple hours and give it a tug.


As for the contest and assisting others - I'm not allowed to wash my right hand for 20 days and then potentially will have the other hand cut into a week after that. However, I am relatively wide open schedule wise to assist/instruct in other people's house or shop assuming I'm not too doped up to drive. For instance, if Tim had a group up to the business, I could keep a machine or two supervised to increase the productivity of the event.

You are right that putting that much heat to it would help. In this case there is no way I am willing to do that. That will remove the heat treatment if there was any done. This receiver is expected to be a very large bore rifle when done. I don't want Anokamnman to feel inadequate so I will not say, bu .001 larger bore would require paperwork be filled out with the ATF and money paid for a "Destructive Device". With that said, there is more then one way to skin a cat, right now the receiver is soaking in ATF, I will heat it a few more times and let it cool in the oil to draw it in. Once I think the oil has done all it can do I am on to the destruction.

Any of the below options are on the table.
1. Drill out the slug progressively until I get close to the threads
2. Mill a slot to just short of breaking through the threads and use a strip of steel inserted like a flat blade screw driver to twist it out
3. Drill out the slug until it is large enough bore and weld the whole circumference of the hole, when the weld cools the slug will shrink and spin right out
4. Weld a bolt to the slug and use an impact to spin it out.
5. Turn receiver into paperweight and buy another Mosin.

[FJ540]

Given the pot metal consistency of the barrel, I'm thinking there's no heat treat done on the receiver, but I haven't taken a file to one either.