Magpies head coach Craig Philpott, who is an assistant coach of the Barbarians side, was thrilled to hear three of his players had made the side.
"It proves they are not too far down the pecking order on the national scene," Philpott said.
With Horrell and West on Barbarians duty, Napier Old Boys Marist pivot Tyrone Elkington-MacDonald is likely to get a second start in the Magpies No10 jersey when they host Thursday's Ranfurly Shield defence against Horowhenua Kapiti at Napier's McLean Park. Buckman, Horrell and West will be available for the July 23 defence against Mid Canterbury.
Former Magpies prop Ben Tameifuna and former Magpies fullback Cory Jane are also in the side. For All Black winger Jane it will be his long-awaited comeback from injury.
Hawke's Bay age group product and new Chiefs lock Dominic Bird is one of three former All Blacks selected. Crusaders loosie Luke Whitelock and Blues hooker James Parsons are the others.
The Barbarians team:
-Forwards: Mitchell Graham (Taranaki), Reg Goodes (Wellington), Ofa Tu'ungafasi (Auckland), Ben Tameifuna (Waikato), Liam Coltman (Otago), James Parsons (North Harbour), Alex Ainley (Tasman), Joseph Wheeler (Tasman), Dominic Bird (Canterbury), Brad Shields (Wellington), Blake Gibson (Auckland), Luke Whitelock (Canterbury), Jordan Taufua (Counties Manukau).
-Backs: Mitchell Drummond (Canterbury), Te Toiroa Tahuiorangi (Taranaki), Andrew Horrell (Hawke's Bay), Ihaia West (Hawke's Bay), George Moala (Auckland), Seta Tamanivalu (Taranaki), Patrick Osborne (Canterbury), Cory Jane (Wellington), Richard Buckman (Hawke's Bay), Tom Taylor (Canterbury).