greyling22
Member
Found in an old man's gun drawer. Any ideas what it is? it might not be assembled right.
Last edited:
What is this? Or these? It says Mauser on it
- Thread starter greyling22
- Start date
You have a Mauser M98 receiver to try that on? I wonder if that is some sort of a receiver face tool. You could find out if one of the threaded pieces screws into the front of the receiver.
This is a Hail Mary, but I wonder if it is for measuring distance to the bolt face from the receiver ring.
This is a Hail Mary, but I wonder if it is for measuring distance to the bolt face from the receiver ring.
jmohme
Member
- Joined
- Feb 17, 2014
- Messages
- 519
It kind of looks like one.
NIGHTLORD40K
Contributing Member
Im with Slamfire on this one, some sort of barrel replacement measuring tool.
OP
OP
greyling22
Member
That's as good a guess as any. The old man did a lot of rebarreling and playing with Mausers back in the day.
Not having the tool in my hand I am not sure how the gentleman used it to take measurements, but it could be used for taking the most important, safety critical, measurement that the shooting community is largely unaware of: cartridge case protrusion.
Firearm owners do become aware of cartridge case protrusion when a case head blows in their favorite thunderstick.
this will come as a shock to those who believe the case is strong and the action weak (these are the ones who state the purpose of a cartridge case is to grip the chamber walls and "reduce bolt thrust") but the fact of the matter is, a cartridge case is a delicate thing, it is a gas seal, and the entire action is there to support the cartridge case and prevent it from rupturing. And it takes very little exposed case head to rupture a case head.
Earl Narramore shows that the Mauser provides excellent support to a case head
bad things have happened when cheap, National Ordnance receivers set back, increasing the cartridge case headspace protrusion to the point that the case sidewall blew. National Ordnance had lots of M1903A3 parts, but no Government receivers. So they had a Spanish company make receivers, and they are still blowing up.
the shooting community is aware of cartridge headspace as it relates to sizing and reloading, and most of us have case gauges. Cartridge headspace is basically a cartridge base to shoulder measurement (in a rimless action) but does not measure the a mount of case head sticking out of the action. I have wondered how the old Mauser gun smiths measured receiver stretch or receiver seat set back in military actions as they are directly related to cartridge case protrusion. Receiver stretch or receiver seat set back would increase cartridge case protrusion and since it is a critical safety measurement, is something that should be checked. I think the tooling shown in this thread could work for large ring Mausers and small ring. I can see threading the devices in the receiver ring and then measuring the distance to the bolt face with the center plug. You can see both tools look like barrel shanks. The M98 tool would seat on the inside receiver ring. A small ring Mauser does not have a inside receiver ring, neither does the M1903 Springfield action. How the guy did that with this tool, I don't know, if the center post slides, as I think it should, that would be the start.
Anyway I was wondering how they measured cartridge case protrusion, and I think that's the tool.
Firearm owners do become aware of cartridge case protrusion when a case head blows in their favorite thunderstick.
this will come as a shock to those who believe the case is strong and the action weak (these are the ones who state the purpose of a cartridge case is to grip the chamber walls and "reduce bolt thrust") but the fact of the matter is, a cartridge case is a delicate thing, it is a gas seal, and the entire action is there to support the cartridge case and prevent it from rupturing. And it takes very little exposed case head to rupture a case head.
Earl Narramore shows that the Mauser provides excellent support to a case head
bad things have happened when cheap, National Ordnance receivers set back, increasing the cartridge case headspace protrusion to the point that the case sidewall blew. National Ordnance had lots of M1903A3 parts, but no Government receivers. So they had a Spanish company make receivers, and they are still blowing up.
the shooting community is aware of cartridge headspace as it relates to sizing and reloading, and most of us have case gauges. Cartridge headspace is basically a cartridge base to shoulder measurement (in a rimless action) but does not measure the a mount of case head sticking out of the action. I have wondered how the old Mauser gun smiths measured receiver stretch or receiver seat set back in military actions as they are directly related to cartridge case protrusion. Receiver stretch or receiver seat set back would increase cartridge case protrusion and since it is a critical safety measurement, is something that should be checked. I think the tooling shown in this thread could work for large ring Mausers and small ring. I can see threading the devices in the receiver ring and then measuring the distance to the bolt face with the center plug. You can see both tools look like barrel shanks. The M98 tool would seat on the inside receiver ring. A small ring Mauser does not have a inside receiver ring, neither does the M1903 Springfield action. How the guy did that with this tool, I don't know, if the center post slides, as I think it should, that would be the start.
Anyway I was wondering how they measured cartridge case protrusion, and I think that's the tool.
Last edited:
Lefty38-55
Member
My thoughts ...
Scooter22
Member
I had no idea but what Slamfire said makes sense. I think the 2 threaded collars are for 2 different receivers with different threads. Both are stored together on the mandrel. Thats my additional WAG.
