備砲 is read as びほう (bihou) and means armament.
びほう
bihou
びちく
stockpile
びぼうかがく
residual value
びこうらん
notes
びちくまい
stockpile rice (kept by the government to use as emergency provisions)
びちくひん
stockpiled materials
たいほう
gun
てっぽう
はっぽう
firing
しゅほう
main battery
くうほう
empty gun
ほう
はくげきほう
mortar