If you have 2 “Arsenal Bugs” on your side of the field, each has ATK 2000.
If the ATK of “Arsenal Bug” is 1000, and it is equipped with an Equip Spell Card or modified by a Field Spell Card, recalculate. So begin with the 1000 ATK, then increase or decrease from there according to other card effects.
When “Arsenal Bug” is Summoned and there are no other Insect-Type monsters on your side of the field, your opponent cannot activate “Bottomless Trap Hole” because the ATK of “Arsenal Bug” is 1000 when it is Summoned.
If the only other Insect-Type monster on your side of the field is face-down, the ATK of “Arsenal Bug” is 1000.
If you equip “Megamorph” to “Arsenal Bug” then its ATK will be 4000 or 1000, depending on “Megamorph”’s effect.