http://www.tf2outpost.com/trade/2744633 - personally sold for 2 keys.

http://www.tf2outpost.com/trade/2779705 - rejected a 4 ref offer.

Tf2 stats show that the G. luchas (7.9k+) is over 9 times more rare than the G. angers (72k+) which is priced at 5 refined.

Both items have a 50% equip rate among owners.

Additonally, all the buyouts on OP are set at the lower end of 5 refined.

http://www.tf2outpost.com/trade/3121784

http://www.tf2outpost.com/trade/3093462

http://www.tf2outpost.com/trade/3067005

http://www.tf2outpost.com/trade/3125759

Etc.

The price in my opinion should be 4.55 at least, but ill wait on making such a drastic jump.