See the links below for the owners and parts manuals.
your air was made by crosman 126 is the Sears vendor code for Crosman Guns made under the J C Higgins brand were made between 1945 and 1962 Your Air gun is a Crosman and it may be the model 150 (pistol) .22 Cal. C02 Single shot. If this is correct and you need more information contact me on my message board and I will try to help you.
Your best bet is to go to a gunsmith.
The C-11 shoots .177 Caliber BB's not pellets
The C-11 is a BB gun. The other two are pellet pistols. Of the three I prefer the 357 it is more accurate than the other two pistols.
The gun was made by Crosman, perhaps that will help your search. ----------New answer--------------- This is a model 600 made by Crosman. It is no longer in production.
Crosman 38 C combat In very good to excellent condition it is bluebooked between $75-$90. Add 20% for original box. Add 200%-400% for the chrome salesman sample pistol
Basically the same pistol. The 1377 American Classic is rated at 560 FPS the new 1377c is rated at a little over 600 FPS. The loading chamber is slightly different the new one has a bolt action. The original 1377 you had to pull the back knob to cock the pistol, the new 1377C the bolt cocks the pistol. Both have a rifled barrel, both shoot .177 cal pellet. I own both of these pistols and find them to be fairly accurate.
there is no hop-up system on a Crosman C-11.
Crosman air guns owns both Benjamin and Sheridan air guns. They offer a service to locate repair shops that work on out of warranty airguns. See the link below. Any JC Higgins airgun that begins with 126 was made by Crosman
The first production semi auto pistol was the Mauser c/96 "broomhandle" pistol.
This rifle was made by Crosman for Wards. it's a model V350 Crosman. It was made between 1961-69. The owners manual is available on the Crosman home page, Click on "Download a Manual" at the bottom of Crosman's home page. See link below.
The model 126.1930 was made by Crosman. It's really a Crosman model 140 made between 1955-68.