M1 Garand bolt gage---Anyone have a pic, or drawing, or have one?

[ordmm]

My google-foo may be lacking but even though I know they exist can't find a pic or reference for the gage that you can set a Garand bolt into and measure length from face to rear of lock lugs. Long time ago the one I looked at used a dial indicator. If anyone can help let me know.

Thanks,

Greg

[Punch The Clown]

Greg, Tony Giacobbe has one. Rare indeed.

[musketjon]

Set the rear of the locking lugs on a pair of 1-2-3 blocks and measure the distance from the top of the blocks to the bolt face with a dial indicator. That's what I did and it works out just fine.
Jon

[RGBvr]

My google-foo may be lacking but even though I know they exist can't find a pic or reference for the gage that you can set a Garand bolt into and measure length from face to rear of lock lugs. Long time ago the one I looked at used a dial indicator. If anyone can help let me know.

Thanks,

Greg

There's a discussion on how to determine bolt length In This Thread (http://forums.thecmp.org/archive/index.php/t-33337.html) at the CMP forums. A reply by E-7Ret. explains the process. Lower in the thread there's a link to a photo which I've embedded here in this reply. "Jerryjeff" on the CMP forums provided the photo.

Richard

http://img.photobucket.com/albums/v643/jerryjeff/rimroad-hra.jpg

In This Thread (http://forums.thecmp.org/archive/index.php/t-33337.html)

[ordmm]

Thanks for the info! RGBvr good pic Thanks! The question came up recently that when installing a new short chambered barrel it would probably make sense to use the "shortest" bolt on hand. That way if headspace increased over time it's possible a "longer" bolt would fix the issue. Right now the bolts are getting sorted by putting a stripped bolt in the receiver and measuring from the receiver face to bolt face. Slow going at best, but does work for classifying the bolts, although does not give a measurement that means anything other than for that bolt/receiver combination. Kinda/Sorta. Now of course this is probably over thinking/over planning a simple issue. But that's what the thinking was.....

Greg

[Orlando]

Nothing written in stone but the following seems to hold fairly true
In order from the Shortest to the Longest :
WRA
-12SA
-14
-17
-19
-2
-65 series
But it will vary depepending on how much wear is on each individual bolt

[RGBvr]

Nothing written in stone but the following seems to hold fairly true
In order from the Shortest to the Longest :
WRA
-12SA
-14
-17
-19
-2
-65 series
But it will vary depepending on how much wear is on each individual bolt

The variance in bolts of the same Drawing # / Heat Lot is a fact. I have a 2.9 mil Garand that was rebarrelled with a 2 '43 barrel, white chambered. The bolt it came with was SA -19, A8 Heat Lot, definately not correct for a 7 '44 receiver, but it is headspaced perfectly. I have two different SA -12, SA-1 Heat Lot bolts which are more correct for a 7 '44 build date. One is too loose the other head spaces fine. I haven't made the measurements outlined in the CMP thread, however it's obvious there can be variance dependning on how much material was taken off the bolt face during finish machining.

Richard

[RGBvr]

Thanks for the info! RGBvr good pic Thanks!

Greg

Don't thank me, this info came from the guys who posted in the CMP thread. My Google-Fu was strong.

[musketjon]

Thanks for the bolt pic. What are the +/- tolerances? Worthless without the tolerance spec.
Jon