Keep in mind that all attacks in Munitions use the rifle, so whichever oder you used the attacks in, it would be Hold -> Redraw -> Hold.
Personally, I would use Combat Jumping, Cloaking Device, Tough (with a Steadfast Protection Res/Def), Weave, and Scorpion Shield to get a fairly high Smashing/Lethal/Energy defense. Add some sets, and you might even be able to softcap all three of those.
Of course, attacks in Mace Mastery would cause redraw as well, but I didn't take anything else out of the pool on my DP blaster, so it didn't matter to me.
@Roderick
Don't pass over the sleep grenade in Munitions Mastery. For a blaster with decent single-target control and damage, it allows a high degree of safety when soloing.
Of course, as you are a tripmine aficionado, it's less useful to you.
@SPTrashcan
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Why MA ratings should be changed from stars to "like" or "dislike"
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I'd lean towards either Mace or Mu for the AoE immobilize power depending on whether you'd rather have a resistance or defense shield. If you don't want to muck about opening up the patron sets Electrical Mastery is quite nice. The shield covers Energy damage as well as S/L (and energy is probably the third most common damage type), Shocking bolt gives you another hold to stack with Suppressive Fire and you've got a choice of two decent panic button powers.
DP/dev. I don't know anything about the epic power pools. Thematically, munitions would be the obvious candidate. I don't know how good or bad any of the powers are. Body Armor is lower resistance than the others, but doesn't cost endurance; not sure whether I care. The hold might be nice, since it'd stack with suppressive fire. Surveillance looks excellent thematically, LRM rocket looks pretty fun too.