Just a note when putting the guns on the Battle Phrog; the .50 cal is the XM-218 and it's a little different from the normal M2. For the kit, adding a small flash suppressor will bring you up to part.
This is also the same weapon used on Marine Hueys and CH-53D/Es, as well as some Navy H-60s (they also use the M-60 and M240 series).
Try this link as a reference.
www.usmc.mil/marinelink/image1.nsf/Lookup/20026172212
It's not the best, but it should help.