View Full Version : Need Springfield 1903 Reciever Prints
03-15-2010, 10:27 PM
I inherited a 1903 from an uncle of mine that was converted to a .22-250 sporter back in the 1960's. The receiver was drilled and tapped, but no currently available mounts line up with the holes. I have already made my front mount, but I do not have a way to find the radius on the raised portion on the rear of the receiver. I also need info as far as the height difference on the receiver so I can get my rear ring to be level with the front base. The Weaver base I bought for the rear has a very sloppy non-matching radius, so I can't reverse engineer anything off of that.
Does anyone know where I can find prints? Thanks
03-15-2010, 10:42 PM
I don't have prints but maybe an idea on how you could measure the radius. Could you just pull the bolt back and measure from the top of the bolt to the top of the hump on the receiver. Then add that to half the bolt diameter and you should be pretty close to the radius. You might have to make some test pieces to get it exact depending on how close you want to be. As for height I would just lay a strait edge across the front base mounted on the receiver and measure the gap between the strait edge and the rear hump.
03-15-2010, 11:49 PM
I've successfully used one of those 100 metal pin contour duplicating gauges found at the hard ware store to copy the radius of a bolt action in order to make a custom scope mount.
Here's a link to what I am talking about.
The first one uses plastic pins
This one uses metal pins, its like the one I have and have used for this purpose multiple times in the past.
After pressing it up against the receiver to get the pins to duplicate the radius, I then placed the gauge on a piece of paper and traced out the image of the radius.
Next I took a compass and made a guesstimate of the radius, placed the compass point and swung the compass to see if it would draw the line on top of the arc I drew by tracing around the gauge.
Took a couple of repetitions, but pretty quick I drew a circle who's circumference matched the one on the gauge, or would have, if it was a complete circle. It was then pretty simple to measure the radius.
Cutting a matching radius hollow in a test block of aluminum using a fly cutter quickly proved it was the right one, and I went ahead and made the scope mount for the customer.
03-16-2010, 02:01 AM
I can email you a larger copy if this will work for you.
03-17-2010, 09:04 AM
Umm..use a radius guage??