can't be answered with the information given
100-300 or so Depending on condition, above $500. The 20 gauge shotguns are rarer and worth more than the 12 gauge. 2/3/12
50-500 usd
Try Brownells, or Numrich Gun Parts online.
The Springfield 20 gauge model 94-B is valued at between $75 and $100. It has a 32 inch barrel, and a 2 3/4 inch chamber.
Depends upon condition and area of the country it's for sale.
I can't speak to the value of the 16 gauge, but in August of 2005 I purchased a very similar gun in the 20 gauge and was happy to pay 600 for it. For me there was some personal value.
25-250 USD or more depending on specifics
20 gauge marlin ou 2 triggers
In the number 28, the digit 2 holds a place value of 20, as it is in the tens place. This means that the value of the digit 2 is 20 times the place value, which is 2 x 10 = 20. Therefore, the value of the digit 2 in the number 28 is 20.
Assuming you mean a Ruger Mk II, it will depend on condition, barrel, sights, etc, but probably $150-$275.
I purchased a new one about 2 years ago at Walmart for $117.00.
Firearms collectors don't pay a premium for "errors". Check Walmart or Gander Mount, etc., for the least expensive new 20 gauge of the same type (single shot, double barrel, bolt, action, etc.) and figure that your used gun is worth 1/2 to 2/3 as much, depending on its condition.