[MultipleParadox]

First thing first:

You should try to get it in Canada instead, for many reasons, such as its better for our economy, our dollar is crap (so you'll end up paying around 130$Cad), shipping is likely to be more than if you order from a Canadian retailer (shipping amount will be in US$ too), there's good chance that you'll have to pay duty and taxes plus the potential brokerage fees for importing. All that put together and there's good chances that you end up paying more than if you bug it in Canada

Also, even if it says Canada Compliant, there's always a possibility of it getting stuck in customs, in which case it can take weeks/months to have it released (you have to do the work to make it happen)

That being said, I can see a well known Canadian retailer selling it for ~150$ right now (I can't put the link here, read the fact)

On another note, no, Lancer Tactical is not really known for being good. There might be better options for around the same price; you should take the time and shop around. There's also tons of threads in here with valuable information about what's good and what's bad, for all kind of budgets

For the stock, everything is possible, not everything can be done by everyone though. Putting the battery in the handguard means you need to rewire the mech box, not really for beginners

Using a different battery that fit in the new stock is probably preferable anyways