What is the value of all 112 proof state quarters?
There aren't 112 proof state quarters. There are only 50 proof state quarters, (along with 6 in the DC/US territories). Unless you are meaning you had both the clad (copper-nickel, common) proofs and the silver proof sets. But just about every clad US proof state quarter is worth about $1 or so, silver proof quarters go for about $7-8 or about fifty cents or a dollar above melt value individually.
The National Parks quarters are still in progress, so a complete set of those won't be possible until the year 2022. A full set of Statehood quarters, including DC and the Territories is 56 quarters (or 112 for both Philadelphia and Denver). None of the coins in the series are rare, but it might be possible to get 50 cents per coin if they're truly uncirculated. That's double face value.
The Crosman model 112 was made between 1950-1954. It is a .22 caliber pellet gun. It came with a C02 tank and hose. Unfortunately you did not state the condition of the gun so no estimate of value can be given. Is it very good, good, fair, or poor condition. Re-post question with this information and I will give an estimate.