Spectre is right. These guns have a seperate receiver mounted on rails which are mounted on the "stock". Some even have an electronic trigger.
As to saboted rounds, if you remember Remington made cartridges many moons ago in the more popular .30 calibers. I believe i still have some in 30-06. I also have in my bullet stock some .30 cal saboted bullets. I believe that the bullet itself is .224. Some time down the road I plan on loading these.
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