Off the top of my head, it sounds like a PA(L) with 3 Jump MP, Max Armor (2 points of Improved Stealth) and a LMG meets all those criteria.
Armored Gloves allow the unit to carry any Infantry Weapon up to 1E crew, so why not a Heavy Grenade Launcher in addition to that LMG? >:D
PA(L)
Chassis: 80 kg
Ground MP: 1 (0 kg)
Jump MP: 3 (75 kg)
2 Armored Gloves: 0 (any infantry weapon with up to 1E crew; NO space)
Armor: 2 points Advanced Stealth (120 kg, 5 spaces)
LMG: 75 kg, 1 space
Up to 50 kg of extra ammo for no space