The victory was the first for the Grizzlies over the Bruins in the five-game history between the two teams.
UCLA (3-4) was hopeful that returning home would help stop a losing streak, but instead lost its fourth in a row. The Bruins were coming off a confidence-building, one-point loss at No. 4 Kansas but weren't able to find their groove against the Grizzlies.
Montana (4-3) held the Bruins to 28 points in the first half by cutting off the inside pass and using a collapsing defense when UCLA was able to get the ball into the paint.
Colosseum Athletics Men's UCLA Bruins Grey Performance Basketball T-ShirtPrice: $24.99 Shop
ESPN's Dan Dakich joins The Paul Finebaum Show to discuss the SEC's presence in the NBA Draft.
Ted Kapita was the top-rated recruit from West Virginia in the class of 2015 and recently played at DME Academy in Florida.
With the Suns drafting Tyler Ulis, they now have five guards on their roster who attended Kentucky.