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No such thing as a 20 caliber shotgun. 20 gauge is the correct term. Blue Book of Gun Values will help. Actually, it can be called both. Especially, if the barrel has 20 Cal. etched on it.
yes
Check the receiver, barrel(s), under the barrel(s), under butt place.
Under $100.
Impossible to answer without knowing who made it, what caliber/gauge, overall condition, barrel length, type of weapon (rifle, handgun, shotgun) and type of action (bolt, lever, over/under, semi-auto)
Remington 8 is NOT gas operated. there is a recoil spring under the barrel shroud. they range from $350 to $650 depending on condition and caliber. Remington 8 is NOT gas operated. there is a recoil spring under the barrel shroud. they range from $350 to $650 depending on condition and caliber. Remington model 8 is NOT gas operated. it has recoiling barrel. there is a spring under the barrel shroud. prices are $350 to $650 depending on condition and caliber.
The current value of an ithica gauge over under with vented rib barrel and auto injectors is $1200.
50-100 USD
50-100 USD or so
20 gauge marlin ou 2 triggers
The value of a Springfield model 245-E 20 gauge 22 caliber over-under gun depends on its condition. This gun in excellent condition is valued between 350.00 and 425.00 as of 2014.
Best left to a gunsmith.