Replacement hammerspring for the Brocock Ghost air rifle

Available in 5 versions:
Low Power – UK 12fltb spec – Brocock state this is for all sub 12 versions, but we have came across rifles with higher power springs fitted from factory – we recommend checking with specs below. 
Medium Power – fitted to higher power rifles but not HP models
HP spring – fitted to HP models
HP1 spring – fitted to HP models (stronger than HP spring)
HP2 spring – fitted to HP models (stronger yet again)