Mosin Rehab Project 2015

Sharky said:
Like the "educated nuts" curious on your process....
Did you drill and tap, then mill away the unthreaded portion?

I'm looking to do something similar with about an 8 Tpi acme thread for a sight in vise.

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Exactly. Drill and tap through the nut then machine away at least 60% of the threads leaving clearance for the thread height plus a little more so the screw can pass through.
 
Holescreek said:
After the 7.62x54r mauser I decided to build a Mosin in the same style for comparison.
I was given a barreled action that had already had some modifications done to it, an ATI bolt handle and scope rail were mounted. The ATI scope rail is beefy but only contacts the receiver ring with nothing in the rear to keep it from bouncing from recoil after the weight of a scope is added. Having done a little slow-motion recording I knew it was going to happen.

I started by removing the scope rail and welding up the screw holes for a fresh start. I made a brass welding backer to fit into the chamber area so I wouldn't have to fight a bunch of weld blobs inside the chamber when I was done.

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This rifle started life in 1943 and the receiver is rough as a cob, given that the Russians were manufacturing to save heir lives all it needed to be able to do was shoot and no time was wasted on finishing.

Because of the ATI bolt handle mod the original handle was already gone and a tapped hole was left in it's place. I was moving the handle anyway so all that was left was to weld up that hole too.

I took a guess at the length I wanted and turned a new handle on the lathe with a slight taper and milled 2 flats so it'd look pretty after the rifle was complete. I tig welded it to the bolt body an inch or so further back than the original would have been.

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I had to shorten the cocking knob extension back to where it's lower lip made contact with the back of the bolt. I don't know much about M-N's but I read that that lip was part of a safety system and didn't want to remove it.

Next the receiver went back to the mill and I cut the notch for the newly placed cocking handle.

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This is beautiful work! What type of steel did you use for the bolt lever and the rail receiver bridge? I'm hoping to do something similar with my mosin, but so far only had the idea to weld some mild steel stock for the receiver bridge and bend Grade 8 steel bolt for the lever. I'm incredibly amateur though, so not even sure if welding that all would be a good idea.
 
SexyPancakes said:
This is beautiful work! What type of steel did you use for the bolt lever and the rail receiver bridge? I'm hoping to do something similar with my mosin, but so far only had the idea to weld some mild steel stock for the receiver bridge and bend Grade 8 steel bolt for the lever. I'm incredibly amateur though, so not even sure if welding that all would be a good idea.
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The Mosin receiver is pretty soft for a military rifle but given the circumstances of the time (needing millions of them quickly) they are still holding up well 70+ years later. This receiver measured Rc32~34 in several placed before I started so my choice of material was easy, I used hot rolled steel for ease of machining and weldability. The bridge doesn't get any strain or pressure, it's just a vertical spacer for the pic rail. Lots of grade 8 bolts have been used for bolt handles on many surplus rifles, I just made my own.

This is still one of my favorite shooters. It's a bit heavy but superbly accurate with handloads. I got an Arisaka receiver in a box of parts a while back, I've been thinking of building it back up in 54r as well just to have 3 oddball rifles.
 
holescreek, in that last video the rifle seems to jump less than in previous videos. Does the muzzle brake have much to do with that? Am curious about what you may have learned about how to make an effective brake.
Beautiful rifle!
 
I've found that one style of brake seems to work best on all my large bore rifles. It's style is loosely based on a Romanian PSL brake. It's only a "brake" in the sense that there is a chamber with a restriction where the bullet leaves the end, but it works very well.

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