Take down screw depth?

[damngato]

I purchased one of these on eBay for my new Ruger 10/22 build.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=271199230605#ht_500wt_1414

I have the Boyds Blaster stock and the screw isn't long enough. The guy was very nice and asked me to give him the measurements of the screw I do need. Does anyone know the depth of the hole with the Boyds stock? Thanks guys!

[damngato]

I have a ER Shaw .920 bull barrel in case that matters