Glasgow trailed for most of the night but staged a late rally to claim a bonus-point 28-25 victory over Munster and tighten their grip on second spot in the United Rugby Championship.
It was earlier in January when RugbyPass exclusively reported that loosehead Milne and hooker Barron were set for moves to Limerick from Dublin and their summer 2025 transfers have now been rubber stamped.
Munster produced a stunning first-half performance as they defeated struggling Dragons 38-19 in their United Rugby Championship clash.
Munster picked up a signature Champions Cup win as they downed Saracens 17 - 12 in an old school tussle at Thomond Park.
There is no return for O’Mahony, whose last appearance came in the December 13 defeat at Castres.
Ahead of the highly anticipated URC matchup between Leinster and Munster, both teams have welcomed back multiple players to their starting lineup.
The hosts had started the night bottom of Pool Four after a loss at Glasgow Warriors in the opening round but an opening try from Jean-Luc du Preez set the tone for a dominant display.
Munster Rugby secured a 33 – 7 victory over Stade Francais at Thomond Park to get their Investec Champions Cup campaign off to the perfect start.