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What length are you looking for? I just saw 10" and 13" factory quick change at LGS. Then you don't have to chop your barrel and change between SBR and 16" within a few minutes
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If you're talking about the factory barrels, the problem with that is the price…. hovering around $1000, give or take $50-$100. That's a lot of money tied up in a barrel to be able to go back and forth. I considered this option, but decided on getting mine cut down.
OP - I had heard that too and probably wouldn't just trust anyone, but my local gunsmith is doing mine because I trust him and because he has done several others that have worked perfectly.