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Old November 5, 2008, 08:33 AM   #3
Jim Watson
Senior Member
Join Date: October 25, 2001
Location: Alabama
Posts: 15,157
It is a Williams Riser Block.
Item no 13053 is .25" wide and item no 13054 is .34" wide to suit the ramp and sight you are using. $7.95

Page 17 in their print catalog which can be downloaded at

Brownells used to carry them, maybe they still do.
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