The stock is made by McMillan, Specifically it is called the MFS-14 stock. You will not find it in any retail store in Ontario to my knowledge. I ordered it directly from McMillan. The stock cost more than the rifle, but it is very very well made and feels spectacular and makes the rifle very portable and comfortable.
F.Y.I. The M14 and its accessories/parts is on the NO-GO export list for being an assault rifle type firearm. In Canada there are no problems with such things as... the customs even classified the stock as "auto parts" on the customs invoice.
http://www.mcmfamily.com/mcmillan-stocks-tactical-stock-list.php
*edit*
Also note.... if you do order one, it will take some time before you receive it. I waited almost half a year (5 months) to receive mine after I had placed the order and payed 10% of cost upfront. So you have time to save up
I dealt with a man named Ryan, Got wonderful customer service!
Ryan Melancon
Production Mgr.
McMillan Fiberglass Stocks, Inc.
1638 W. Knudsen Dr.
Phoenix, AZ 85027
623-582-9635 ext. 108
Orders: 1-877-365-6148
ryanmelancon@mcmillanusa.com