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3,673 Posts
Hello friends,
It's been a couple of years since I've had the chance to really spend much time with my rifles and parts. Thankfully, the pendulum's swinging in the other direction now and I'm able to at least start digging through parts and roughly piecing them together for future restoration projects.
Today I had the chance to focus on a nice barreled receiver that I purchased a while back, from the CMP I believe. The serial number is 79869 and it carries a barrel dated 10/40. Interestingly, Scott Duff's "little blue book" states the approximate "month end" serial number for October 1940 as 78306 (page 3), but if you check out the data sheet on page 19 it outlines serial number 79115 as an October 1940 example. Either way, my barreled receiver is a mere 754 numbers higher and I believe this barreled receiver would have been assembled in very late October to maybe the first week of November, 1940. Therefore, I'm going to follow the data sheet provided for 79115 since it's always best to err on the side of early with these projects.
After a quick cleaning I gaged the barrel, TE=3 and ME=4. The bore is bright and shiny, and I believe that the barrel has seen little use overall. The chamber is in the white, and the finish is uniform overall. Impossible to say that it's original to the receiver, but I do believe that it's authentic and in as new condition as you could ever expect to see a barrel of 1940 vintage.
Next I tackled the rear sight. Duff's data sheet calls for a flush nut rear sight, so I dug through my stash and assembled what I think is a sight that's "good enough" for now. I'm not entirely happy with the windage knob and elevation cap, but checkered examples of either are not exactly cheap nor common so they are what they are for the time being. Here's a breakdown of the rear sight's parts:
Rear Sight Base - early, unmarked, with extra "1940" cut.
Aperture - early, unmarked, no tracks w/ SA profile.
Cover - unmarked, no ribs, blued.
Pinion - short, unmarked, blued (real).
Spring - without finish (in the white).
Spanner (flush) Nut - blued (real).
Windage Knob - checkered, closed arrows.
Elevation Cap - unmarked, checkered, closed arrows.
After the rear sight, I went ahead and selected a clip latch. It's important to note that 79115 lists a rounded clip latch, of course, but you need to be careful when selecting a clip latch. The rounded appearance is not always the way to identify them. You must look at the front end of the latch to ensure there's not a small square-shaped cut out where the pin enters the body of the latch. If no square cutout is present then it's a true rounded example. Finish doesn't matter much, but I selected one that was reasonable to what could be found on my receiver in late 1940.
Next is the bolt. The data sheet for 79115 lists a 2SA C12A bolt. I sorted through a pile of bolts and no luck. This is were erring on the side of "early" helps. SA 67935, September 1940, is reported to have a 2SA T1 bolt and so is a later example, SA 89934, which is a November 1940 example. Thankfully I have a few 2SA T1 bolts to choose from, so a T1 it is. Using three different sets of authentic USGI headspace gages, I was able to confirm that the bolt I chose out of the group is safe to use in this barreled receiver. The bolt closes nicely on 1.940 (GO), not quite closed on 1.946 (NO GO), and not even close to closing on 1.950 (field reject).
That's all for today's progress. Hopefully I'll be able to work on the project a bit more later this week.
Cheers, and Happy New Year to all of you.
----Brian
It's been a couple of years since I've had the chance to really spend much time with my rifles and parts. Thankfully, the pendulum's swinging in the other direction now and I'm able to at least start digging through parts and roughly piecing them together for future restoration projects.
Today I had the chance to focus on a nice barreled receiver that I purchased a while back, from the CMP I believe. The serial number is 79869 and it carries a barrel dated 10/40. Interestingly, Scott Duff's "little blue book" states the approximate "month end" serial number for October 1940 as 78306 (page 3), but if you check out the data sheet on page 19 it outlines serial number 79115 as an October 1940 example. Either way, my barreled receiver is a mere 754 numbers higher and I believe this barreled receiver would have been assembled in very late October to maybe the first week of November, 1940. Therefore, I'm going to follow the data sheet provided for 79115 since it's always best to err on the side of early with these projects.
After a quick cleaning I gaged the barrel, TE=3 and ME=4. The bore is bright and shiny, and I believe that the barrel has seen little use overall. The chamber is in the white, and the finish is uniform overall. Impossible to say that it's original to the receiver, but I do believe that it's authentic and in as new condition as you could ever expect to see a barrel of 1940 vintage.
Next I tackled the rear sight. Duff's data sheet calls for a flush nut rear sight, so I dug through my stash and assembled what I think is a sight that's "good enough" for now. I'm not entirely happy with the windage knob and elevation cap, but checkered examples of either are not exactly cheap nor common so they are what they are for the time being. Here's a breakdown of the rear sight's parts:
Rear Sight Base - early, unmarked, with extra "1940" cut.
Aperture - early, unmarked, no tracks w/ SA profile.
Cover - unmarked, no ribs, blued.
Pinion - short, unmarked, blued (real).
Spring - without finish (in the white).
Spanner (flush) Nut - blued (real).
Windage Knob - checkered, closed arrows.
Elevation Cap - unmarked, checkered, closed arrows.
After the rear sight, I went ahead and selected a clip latch. It's important to note that 79115 lists a rounded clip latch, of course, but you need to be careful when selecting a clip latch. The rounded appearance is not always the way to identify them. You must look at the front end of the latch to ensure there's not a small square-shaped cut out where the pin enters the body of the latch. If no square cutout is present then it's a true rounded example. Finish doesn't matter much, but I selected one that was reasonable to what could be found on my receiver in late 1940.
Next is the bolt. The data sheet for 79115 lists a 2SA C12A bolt. I sorted through a pile of bolts and no luck. This is were erring on the side of "early" helps. SA 67935, September 1940, is reported to have a 2SA T1 bolt and so is a later example, SA 89934, which is a November 1940 example. Thankfully I have a few 2SA T1 bolts to choose from, so a T1 it is. Using three different sets of authentic USGI headspace gages, I was able to confirm that the bolt I chose out of the group is safe to use in this barreled receiver. The bolt closes nicely on 1.940 (GO), not quite closed on 1.946 (NO GO), and not even close to closing on 1.950 (field reject).
That's all for today's progress. Hopefully I'll be able to work on the project a bit more later this week.
Cheers, and Happy New Year to all of you.
----Brian




