Senco nailer question

I bought senco framing (stick) nailer in a yard sale. It is little used and works fine with 3" nails. It has a sticker that reads, "Block out recommended for 1 7/8 - 2 1/4 nails". What is block out?
Thanks in advance. David Todtman
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David Todtman wrote:

It's an optional nail guide that clips into the rail assembly when using shorter nails. See:
http://www.toolpartsdirect.com/cgi-bin/schematic.cgi/senco/SN70
--
Jack Novak
Buffalo, NY - USA
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Thanks Nova.

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