simple barrel timing jig

D

dimeN

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northern ontario
Hi
came up with a simple jig to index the barrel :

I'm using a starrett precision machinist level 6inch to time the barrel to the receiver. The problem is that there is no large flat surface on which to put the level ! On the M1a there is a small flat behind the rear sight which this small jig can rest ..

basically i used some precision ground O1 flatstock ( bought from kbc tools ) and i drilled some holes for threaded rod .. tapped and picture speaks for its self.. you can make sure the flat is good by comparing it to a 3/8" in precision ground rod placed in the holes for the rear sight

20131023_133210_resized_zps50fe9141.jpg
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now you have a nice flat to place the level
http://i43.photobucket.com/albums/e396/dimenickel/vise%20n%20stuff/20131023_133154_resized_zps6b7cbafd.jpg

http://i43.photobucket.com/albums/e396/dimenickel/vise%20n%20stuff/20131023_133434_resized_zps8fd1eddc.jpg


the key is to make dead sure it is flat... and de-burred ..... check it on your surface plate
 
to index the front sight there is a small flat where you put your front sight on ! with the springfield brake it was quite flat as worked in this case

- i used another piece of O1 precision ground flatstock and milled a small slot to fit around the dovetail ( you can easily do this by chain drilling a couple holes and using a chainsaw round file to eat out the metal for the slot... no need for a mill )

20131023_133519_resized_zpsf3ac44b5.jpg
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20131023_133501_resized_zps9612977b.jpg
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20131023_133536_resized_zps5b96f02b.jpg
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thanks

brownells was alway out of the badger jig, so i decided to rig up somethin

worked very well, but took a while to get it leveled dead on ...
 
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