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Since you are the SBR "manufacturer", some receiver engraving may be involved. Can't help you there, though.
as far as engraving goes...These guys are the best from what I hear. They do these SBR engravings often and for $25
Here is the info for those interested:
Bye Engineering
503.246.4653
Darla does the pattern work with you & Doug engraves the weapons
They are located in Portland, OR
here is a useful thread on this:
http://www.northwestfirearms.com/nfa-weapons/19687-sbr-engraving-who-does-what-do-they-do.html