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Why not?
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It’s the difference between the two guns as to how ”ventilated shroud/foreward grip/ejector-rod” assembly is held onto the barrel/receiver.
On a SWD Streetsweeper the barrel nut (that holds the ventilated shroud assembly up tight against the receiver) is located right up against the shroud itself and the barrel is externally threaded right behind where you would traditionally cut. You can see the bare barrel past the barrel nut on a SWD Streetsweeper.
So you chop the barrel right in front of the existing barrel nut and the barrel nut will stay on the threaded portion of the barrel and continue to hold the ventilated shroud assembly in place.
On an Sentinel Striker-12 the ventilated shroud is held in place via a threaded “tube” that acts like a barrel nut does on the SWD Streetsweeper. The tube completely covers the barrel from the end of the ventilated handguard all the way to the tip of the barrel and even has a “faux” knurled barrel nut toward the rear of the tube.
The big difference is the location of the actual threads on the Striker-12 barrel that hold this tube/extension on the barrel. On a Striker-12 the “barrel nut/tube” piece's corresponding external threads are at the very tip/end of the barrel. So if you unthread the tube/barrel-nut part off the gun and then cut the barrel off in front of the ventilated shroud, you just cut the threads off the barrel that hold the tube/barrel-nut in place and which in turn hold the ventilated handguard assembly in place against the receiver.
So while you can technically cut back the 18” barrel on a Striker the ventilated-shroud/foregrip/ejector-rod assembly will slide/fall-off the front of the gun as there is no way to add a barrel nut to hold it on. (I have seen some strikers where they were cut down and then the steel shroud was welded/glued in a pretty ugly fashion to the aluminum barrel)
To make matters more complicated....unfortunately, the spot on the 18" barrel where the threads would be located on the factory 12” barrel is turned down too far in diameter to thread for the factory 12” Striker barrel nut to function even if you tried to externally re-thread the factory 18” barrel right in front of the shroud.
So on a Sentinel Striker-12 you can either cut it back, thread the barrel in front of the shroud and have a proprietary knurled barrel nut made to hold the shroud assembly in place or you buy the factory short barrel and barrel nut and swap them out.
On my personal Striker I replaced the barrel with a factory 12” barrel from the secondary market and then got Combined Systems to sell me the factory knurled short barrel barrel nut.
Overall the Sentinel Strikers are better guns vs. Streetsweepers but come with a larger commitment if you plan to cut down the formerly 18” Title 1 versions
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Hope this helps