pretty sure 20 or 21 inches
Have a Model M-846 (Montgomery Ward) semi auto with 18 inch barrel.
The Cooey Model 64 B .22 caliber semi-automatic rifle was produced primarily in the 1960s. Based on the serial number CA061736, it is likely that your rifle was manufactured around 1966. However, for an exact year, checking with Cooey's production records or a firearms expert would provide more accuracy.
AFAIK, there is no Winchester Model 90A. Is it a lever action, slide action, bot action, semi-auto or single shot? What caliber? What type and length of barrel?
30 inches. A longer barrel gives you better accuracy.
No, it is a bolt action.
Clean it. Try different ammunition. If neither works, find a gunsmith
Need serial number please.
Need more information - is this model a 9mm semi-auto carbine or pistol? Length of barrel and description of firearm is needed.
if you want it to be it is semi auto
16 inches, as required by the NFA.
Model 24 is a semi-auto 22.
Best left to a gunsmith.