We do, to a certain extent.
Simple accessories and such can be picked up directly from us, if in stock, on a drop-in basis.  For assemblies, including rifles, upper halves, lower halves, etc...we'll be happy to take your order, but it just goes into the production line-up in date order with all of the other orders that are in-house.  
Stripped lowers are not available for immediate purchase, with lengthy delays on them right now as most of those we make are dedicated to rifle production at this time.
Steve/RRA

Thanks.