The firm, formerly known as Dittoprint, hopes the investment will take it into the PrintWeek Top 500 by adding at least 2m to its current 3.3m turnover.
It is replacing a four-year-old four-colour press but will retain a five-colour Speedmaster 74.
It is also adding a second buckle folder and Polar 92ED with Transomat powerlift and jogger.
The firm prints match programmes for both Rangers and Celtic, and chief executive Jim Watt said the new press would enable it to turn around the Rangers job in three hours.
DP21 employs more than 50 staff and also has digital printing capacity.
Have your say in the Printweek Poll
Related stories
Latest comments
"I'm sure this will go down well with print supply chain vendors. What terms is it that ADM are after - 180 days is it?"
"Hello Set Off,
Unencumbered assets that weren't on the Reflections books, I believe.
Best regards,
Jo"
"Just wondering who Rapidity are buying the equipment from as there would not appear to be an administrator for the Reflection companies as yet?"
Up next...

Completed this week
Northside Graphics makes first acquisition since private equity investment

Sales of more than £14m
Carton and display board specialist files NOI

Software deal
Print.com parent acquires ISI Publishing Innovators

Berlin show next month