These don't and aren't powerful or accurate enough for your purpose.
I suggest sticking with C02 airguns -- they're cheaper and fit your needs.
Airsoft guns only fire plastic BBs for the general amount. Metal coated ones are rare, expensive, and not really useful in a unupgraded gun.
RS Type 56-1 & RS Type 97B & KWA M11A1 w/steel kit
KJ M1911A1 & KSC G19 + AI Grenade