22lr bore plug ?

can't you make your own with rtv ?
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formed to fit almost anything and it's easy to clean up after if it's what you are talking about I am not positive
 
Same here as joecamel. I use these. I just crammed one in the chamber of my 457 to get an idea of how long it needed to be. Popped it out and lopped some off the fat end. Stuck back in there with some sticking out and closed the bolt. Put an Al rod in the barrel and filled it with cleaner. Worked good, no leaks.


Amazon product ASIN B00V6H1IW0