Nov 30 (Reuters) - U.S. sporting and outdoor products group Vista Outdoor's board has rejected a cash-and-stock merger offer from Czech gunmaker Colt CZ Group , the company said.

Vista's board said in a company filing on Wednesday evening that it maintained its recommendation to sell its sporting products division to another Czech company, Czechoslovak Group (CSG), in a $1.91 billion deal announced in October.

Colt CZ had made its offer to Vista last week, proposing to keep the U.S. company whole and valuing its shares at a 16% premium.

"The Board of Directors has determined that the (Colt CZ proposal) would not be more favourable to Vista stockholders from a financial point of view than the transactions contemplated by the CSG (agreement) and does not provide a basis for engagement with Colt CZ," Vista Chief Executive Gary McArthur said in a letter posted on the company's website.

"The Board of Directors is therefore rejecting the (proposal)."

Vista said CSG's acquisition of the sporting products division should close in 2024 pending shareholder and regulatory approvals.

Vista said Colt CZ's offer did not take into account the value created by splitting the outdoor and sporting divisions, and the valuation of $30 a share in the proposal undervalued the company.

Vista shares have climbed 8.3% since Colt CZ's offer but are down almost 15% since the deal with CSG was announced, closing Wednesday at $27.89.

Prague-listed Colt CZ shares have dropped 2.0% since its proposal to Vista.

(Reporting by Jason Hovet in Prague; Editing by Sharon Singleton)