Hi folks , I have a PC4 that i bought new ,one of the later models to be made , I took off the stock from the barrel/receiver for basic cleaning and found that it did not have A receiver spacer or was missing , that little spacer inside the stock under the barrel/receiver , it has A molded shape for it , but it was not there, now the point here is , just one time before , i had A gunsmith clean it for me , i don't know if he Lost it or it came from the factory with out one , this is the second time its ever been take apart, the manual says in reassembly , (ENSURE THAT THE SPACER IS IN PLACE INSIDE THE STOCK IF YOUR CARBINE IS SO EQUIPPED ) do you all think Ruger would know if i gave them the serial and model numbers ? thanks for any info. or opinions.