Spring, spring guide, end cap to fit the spring version because they're different than the gas rams. Email Hatsan using their General Inquiries form, NOT the Customer Service form, they seem to answer quicker that way:
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Should cost you less than a new ram which is something like $45. Don't like the QE? Take it off and put a can on it. The end of that barrel is already threaded.
Just want it gone, sell it as a parts rifle...someone is always looking for parts. I was when the ram in mine went (MY fault, NOT Hatsan's) and Mr Spiral up there sold me his for $50. Slapped my .25 barrel onto his tuned springer action to rebuild mine as a springer and still have that rifle now 7 years later.