Presently There isn't much in the way of in stock Canadian lowers so you maybe limited to what is available as apposed to what you want. Aero, Spikes, LMT (all forged), DLASK and ATRS billets (good but expensive) are all good with NEA (in stock at SFRC) bringing up the rear. Questar has an excellent in stock Tactical Innovations - T15 BDX AR-15 Billet Machined EDM Deluxe Stripped Lower which is a good foundation for a good Rifle. Another option is IRUNGUNS which has a couple lowers that can be imported from their US store.