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Discussion Starter · #1 ·
I have a Hilti dx400b powder actuated gun. The stop ring needs replaced (doesn't slide without a hammer's help). This stop ring is used to maintain the position of the piston during operation.

Hilti doesn't provide parts for this model any longer. Does anyone know where I may find this part? PN:0300962.

It seems as though you could still use the gun in the upright position without the stop ring. Because the piston is already positioned properly.

Help anyone!
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