I've bought several stocks from them, and I have that exact set (and it's beautiful). Just be patient, as everything on their site goes on sale at least once a year, and the stock you want will show up for $99 at some point. Call to order and in addition to the sale price, you'll pay shipping and taxes and duty to CBSA.
Your M14 might not drop right into the stock - there might be some very minor removal of material for the trigger group to latch closed.