There are some one-piece 14.5" outer barrels out there...and others where they can be unscrewed to 10.5" length. The "seam"/joint should be obvious with close inspection.
The two piece barrels are typically very hard to take apart. They are usually glued at the factory...either with some sort of cyanoacrylic (krazy-glue) or Loctite-like compound. Typically, if it won't come apart with two pliers/channel-locks...then I use a propane torch and heat the area around the joint really well to soften/vaporise the glue. After that...they'll usually come off. Caution...the barrel really soaks up a lot of heat, so use gloves/etc...
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