There are several ways. First I suggest you spell it Crosman not Crossman. it will make it easier to locate your model.
1. do a search on the web for "Crosman air guns" in Google. Then look at the photo results and match your air gun.
2. Go up on the CROSMAN web page and look at the current models.
3. Go to the library and look up a book called "Blue Book of airguns" and match your model
4. Look on the left side of the barrel and locate the model number
1. Usually it is on the barrel near the left side of the loading point.
2. there is a "bluebook of airguns." The current version is "10" but almost any version will list most all air rifles. You may be able to find it in a library or book store.
3. Crosman list all their Owners and parts manuals online (see the link below)
4. do a Google search of "Crosman air rifles" then look at the image section of Google for the results, you may find it that way.
Crosman owns Both "Sheridan" and the "Benjamin" line of products (Airguns)
I don't believe Crosman ever made a model 40 rifle. I have no reverence to any model by that number made by Crosman. However they did make a model 140 from 1954 to 1968 in four variations.
I do not know of any model I-350 made by Crosman, but they did make a push barrel rifles known as a model V350 between 1961-69
Crosman did not make BB guns until 1947, so there is no 1924 model BB pistol. Crosman did make their first BB rifle called the 1923 model. It had a plunger under the barrel to pump up the gun. Benjamin had been using this design on their pistols starting in 1935 but crosman never used it on a pistol only on the first model. Now back to the Crosman rifles, the second Crosman rifle was the 1924 model and it used a pump handle under the barrel to pump up the gun. Yes I have a photo of a Crosman 1924 model but "Answers" has no way of displaying photos, so sorry your out of luck. FYI: Crosman is spelled with one "s" not two. CROSMAN
I believe you are asking about a Sears model 126.102940. If I am right, then it is a Crosman model V350 BB rifle caliber 175, Push barrel made between 1961-1969.
I can find no record of Crosman ever making a model 3101 but they did make a model 3100 from 1987-90 See the link below for the full list of old Crosman models
We MAY be able to find answer for you, if you can find the MAKE of the rifle for us.
It would be nice to have a left handed model (I'm also Left Handed.) But unfortunately Crosman doesn't make a left handed stock for this rifle. You would have to find a woodworker who makes stocks in order to get one made. I would search the web for "Custom Rifle stocks" and start there.
That will depend on the make of the rifle and the age of your pump rifle.
A person can make the pump easier to operate on a Crosman 760 air rifle by applying oil to the seals. This will provide lubrication and improve the overall action of the weapon.
Crosman never made a model 1881, but they did make a model 1861 called the Shiloh. If this is the gun you are asking about then see the link below
Winchester made the model 1873 rifle and the model 1876 rifle,but did not make a model 1875 rifle.
Crosman never made a .22 cal BB rifle. They made several .22 Cal Pellet rifles over the years. Several are still in production.