I use an 18.5 pound spring in mine. Seems to work fine.
I have one of those little plastic Shock Buffs in my gun, and they Shock Buff seems to last a long time, so I don't think the gun is being battered with the 18.5 pound spring and +P ammo.
I must say, though, I can't really tell ya that a 16 pound spring is inadequate- might work just fine, too.
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