Polymer BUIS Iron Sights - Multiple Pairs - Magpul MBUS, BT APC

Have 4 pairs of polymer BUIS:

1. Magpul MBUS Gen 2 - Black
2. Magpul MBUS Gen 3 - Black - SOLD
3. Magpul MBUS Gen 3 - FDE - SOLD
4. BT APC - off a BT APC308 (exact same function as MBUS Gen 3; higher end - Swiss B&T product)

$100 per pair - shipping extra (flat rate x-small box)

Save some cash from new (~$150+ CAD new)