In addition to the info ddp59 dug up from NavSource, that is also what is on the RJ and Ingraham official web sites: 2-triple tube torpedos, 1- 76mm gun, 2-25mm, 2-.50s, 1 CIWS.
Now, being only a Navy fan and not expert, and again, setting aside the helicopters, I still think the ships are under-armed and are really more of a sea-going patrol craft, as opposed to being a sea control ship as orignally designed and appear to be "over-resourced." Note: I'm an OHP fan; I've always liked their looks; and this is strictly an observation. Sort of a "Thoughts I've Thunk."
Please to compare:
Visby class/corvette/Sweden - provision for 8 RBS-15 SSM, 1 57mm/70cal DP, 4 15.7 inch torpedo tubes, 4 ASW RL, reservation for SAM system. (No aircraft, but only a 1/5 the size of a OHP.)
Type 23/frigate/UK - 8 Harpoon, 1 Sea Wolf VLS (32 missiles), 1 114mm/55, 2 30 mm,
4 torpedo tubes
Type 22/frigate/UK - 8 Harpoon, 2 6-cell Sea Wolf (72 missiles total, manual
reload), 1 114mm/55 DP, 1 30 mm Goalkeeper CIWS, 2 triple 12.75 inch torpedo
tubes, 2 30 mm
F85s/frigate/Norway - ESSM (VLS), NSM SSMs, 12.75" torpedo tubes, 76mm OTO gun, 12.7mm MG (about 20% larger then a OHP)
Type 123/frigate/Germany - 4 MM38 Exocet SSM, VLS for 16 Sea Sparrow SAM, 1 76 mm
OTO DP, 2 21 cell RAM, 4 12.75 inch torpedo tubes, 2 20 mm
Nils Juel class/corvette/Denmark - 8 Harpoon SSM, 6-cell VLS Sea Sparrow, 1 76 mm OTO DP, 4 20 mm (No aircraft)
source: http://www.hazegray.org/worldnav/