After doing some research, I believe the only part that you can upgrade is the spring and spring guide.
Some say vsr, other day L96.
Now I was wondering what spring and spring guide do I need?
Something like this?
http://www.evike.com/product_info.php?products_id=35660
http://www.evike.com/product_info.php?products_id=35659
Let me know which to get with a canadian retailer.
Thanks!