HRA Bolt Identification & dates or range of use

[farmritch]

I never realized until last night there were 3 different types of bolt configurations
Also never knew when or where they were used in the scope of things.
Can anyone shed light on this?
There is a link to the pics below.
All comments welcome
Thanks!
Farmritch


6528287 H.R.A. U.W
D6528287 HRA .U.
6528287 HRA .U.

Pictures here
HRA Bolt Album pictures by farmritch - Photobucket

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