knights armament barrel swap

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I dont see anything about a proprietary chamber in knights info on their site. Are you talking about the round lug bolt? and if it requires a specific extension on the barrel?

If so from my limited research, the e3 bolt is specific to the bolt extension, which is not easily remove able from the barrel.

Are you changing barrels just to have something different or is your barrel shot out? If its just for something different, id suggest getting a new bolt to go with the standard extension your new barrel will have, and keep your old bolt with its barrel.
 
So you're wanting to take the SR15 extension and put it on another barrel? I suppose it's hypothetically doable, but I wouldn't advise it. At the very least you will probably need a lathe. I'm also not sure what tool you would use to remove that extension, but I imagine KAC has something proprietary they use that they fabricate in house.
 
you could probably get it off with a pair of barrel vices, or a barrel vice and pipe wrench.....but again not easy, and probably not a good idea. KAC might sell you just an extension if you want a custom barrel.
 
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