Firearms that are imported into the US must go through a legal process- and it is much more complicated than simply dropping the rifle in the mail. As your question is phrased, my answer would have to be probably not. Sorry-
(in the US) Yes, you may.
no you cant
You can mail an entire rifle or shotgun thru the US Mail- it must be unloaded. You will find that in chapter 14 of the Domestic Mail Manual, under Restricted Mailings. IF the owership of the rifle is being changed, and it is going to another state, it must go TO a firearms dealer in that state.
US postage is used to send mail from the US to any other country.
what is the required postage from california to canada for a letter?
Ye,s you can if you are mailing from the US.
100.00 Swedish Franks.
80 cents
International lettermail from the US to Canada is $0.80 through USPS.
First Class Mail is delivered in 3 to 5 days.
To mail a first class letter from the US to Canada is $1.15 as of 2014. This is for 1 ounce or less. More than an ounce will cost additional.