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Bolt catch repair


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On the recent test fire of my AR 308 ,the Bolt Catch failed to catch the bolt after last round . This occurred with three differant manufacturer's mags.

After making sure there were no burrs on any of the parts & no interference with the mechanics of the BC. This included making sure the spring would have proper travel.

I stoned a few thou. off the stop for the BC. lever to let it pivot a little more . After checking how far the mag follower pushed up the BC. up ,I stoned until I got the Catch to stay engaged with or with out an empty mag in place .

The measurements of what I came up with my help others ,if this problem comes up . The thickness of the end of the catch that rests against the lower receiver , that I have is  0.209" ,this measurement doesn't mean much because there could be variations from part to part .

The one I got to get the Catch to catch the bolt & keep it there might help. 0.414 ,Is the height the top of the Catch is from the flat of the Receiver below it . In other words how high it sticks up to catch the bolt ,but not to high to interfear in some way.

I will post some photo's in the morning .


[img width=810 height=607]http://i394.photobucket.com/albums/pp30/oldpanhead58/LH1483.jpg

[img width=810 height=607]http://i394.photobucket.com/albums/pp30/oldpanhead58/LH1481.jpg

[img width=810 height=607]http://i394.photobucket.com/albums/pp30/oldpanhead58/LH1485.jpg

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