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-   -   A4 bolt maybe (http://forums.thecmp.org/showthread.php?t=94760)

Allen Humphrey 01-05-2013 08:11 PM

A4 bolt maybe
 
I've never had the opportunity to study an A4 bolt other than photos. However, I just picked up a sporterized A3 and the bolt it came with looks pretty good. Too bad it has been polished and jewled. the photos show the only markings.

Can you guys tell me if you think it is real or just modified?

How hard is it to hide the jewling with park?

http://i1320.photobucket.com/albums/...ps6b6af5b7.jpg

http://i1320.photobucket.com/albums/...ps90622b0d.jpg

http://i1320.photobucket.com/albums/...psad3f596b.jpg

http://i1320.photobucket.com/albums/...ps7153d1fd.jpg

http://i1320.photobucket.com/albums/...psd99145f3.jpg

chuckindenver 01-05-2013 09:47 PM

yup....

Peconga 01-05-2013 10:59 PM

Ditto. You have a winner. :GS:

To refinish, first remove extractor and extractor collar and clamp the bolt in a padded vice. Then use some medium grit emery cloth wrapped around the bolt, working it back and forth in a shoe-shining motion to remove all traces of the jeweling around the bolt body. You may also need to use a combination of wood sticks or other improvised tools as a sanding block to clean up the edges and sharp corners. Take a look at the surface texture on an original 03-A3 bolt and attempt to replicate it with a combination of emery cloth and sandblasting with various combinations of air pressure and abrasive media. Keep experimenting until you either get it "close enough", or run out of patience. Next, attempt to replicate the original black oxide finish (as issued) or greenish-gray Parkerized finish (as seen after an arsenal rebuild). Plan on doing it two or three times until it either looks "close enough", or you run out of patience. When you are all done, please post pictures and tell us how you did it, so we can all admire your skill and handiwork!

As an alternative, contact board member "chuckindenver" (see above) and find out what he will charge to restore it for you. Given the cost of an original 03-A4 bolt, having the work done by a professional would probably be well spent.

Once again, congrats on a great find!

John Beard 01-06-2013 02:39 AM

Seasons' Greetings!

As others have posted, you do indeed have a real A4 bolt.

Removing the jewelling is appropriate only if you intend to restore the bolt as closely to original as possible, which I recommend. Otherwise, you're wasting your time.

As Peconga has advised, the jewelling may be removed by using emery cloth. Emery cloth was used in the machine shop during original manufacture to apply the original machined finish to the bolt. You, therefore, must be careful to follow the pattern that duplicates the original milling and emery cloth marks.

Once you have restored the original emery cloth marks, you should then have the bolt re-blued as closely as possible to the original finish.

Hope this helps. Congratulations on your good fortune. And Happy New Year!

J.B.

jaguar88xj6 01-06-2013 08:33 AM

Actually the jeweling has functiom. The swirling in the metal holds oil and keeps the bolt lubricated and it runs a lot smoother. If it's just a shooter It gives it a little personal touch.

Allen Humphrey 01-06-2013 11:38 AM

Thank you all for the information. I guess I'll have to figure out what I want to do with the bolt. The rifle I bought will be a regular shooter as it is already mounted with a Redfield Jr. However, I won't be using this bolt in that rifle now that I know what it is. It is a good problem to have!

dprice3844444 01-08-2013 07:20 AM

heat treatment info 1903
http://m1903.com/03rcvrfail/
http://m1903.com/rbmarks.htm ordnance markings stock markings
http://www.vishooter.net/SA.txt
http://www.bowersweapons.com/US%20MO...R%20RANGES.htm
http://www.90thidpg.us/Reference/Manuals/TM%209-270.pdf 03a4 sniper manual
http://forums.thecmp.org/showthread.php?t=123976
http://cartridgecollectors.org/?page...-06-cartridges 3006 identification
http://www.trfindley.com/origstmps/03inspinitb.html

different hole sizes for m14/m1a and garand rear sight aperatures
http://shop.shootingsight.com/Reduce...d-Aperture.htm
https://m14forum.com/steel-wood/4887...03-s-safe.html
https://forums.gunboards.com/showthr...number-thought

dprice3844444 01-08-2013 07:52 AM

http://www.jouster.com/forums/showth...a-1903-A4-bolt

http://www.scribd.com/doc/75857340/1903-Schematics parts schematic

http://www.vishooter.net/m1903.html bolt ident

DMark 01-11-2013 10:33 AM

I'm going to ask the question that nobody else has.

The sporterized A3 that this bolt came with.......

Is the Remington name and SN offset like this?

http://i49.tinypic.com/28gs46f.jpg

:rolleyes:

Ijt101 03-23-2013 11:51 AM

How do you tell the difference between a standard 03 vs 03a4 bolt.

Just the curve of the handle?


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