I am unable to locate any air gun company named "Huntington".
Please check the name again..
Blowback on a BB gun is a repeater. When you pull the trigger the gun fires and the top of the gun reciprocates (Blowsback) and auto load and cocks the next shot. If you have ever seen a modern forearm slide back an forth each time it is fired then you have seen Blowback.
There have been several models of the marksman repeater. The first one was made in 1955
see the link below
see the link below for the owners manual
You can load as many BB into the repeater as it will hold, BUT only one pellet at a time can be loaded into the barrel. One shot one pellet.
It's a 16 shot BB repeater or a SINGLE shot pellet rifle
No It is not a repeater , you must re cock and and hand load a pellet after each shot!
Consult the user's manual
One of the Cheapest is the Marksman 1010 Repeater. It cost under $30 and is not accurate nor powerful.
Put in the magazine. load the magazine, and shoot.
see the link below for the owners manual. The Marksman Repeater is a 4.5 .177 caliber pistol not a 5.5 .22 caliber pistol.
Each model is different. You need to state the model to get an answer.