Grex A150016 - Trigger Grex from $10.91 $13.30 Qty. Add to Cart SKU: GRX-A150016 This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Genuine Grex replacement part A150016 - Trigger. For Grex Models XT, TG, TS. Chart referance number 21. Tweet