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Never had any issue with the full nylon tooth piston, but after installing two full metal teeth DF pistons in two different guns, both with bearing spring guides, found that BOTH guns had the piston sieze on the guide's washers. Seriously don't recommend that piston. Get a Modify piston instead, less problems than the DF ones have.
And it was the full metal teeth piston vs. bearing spring guide, changing back to a stock spring guide, the gun ran smoothly no issues.
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