The OX springs in this listing are suitable for all versions of the Air Arms ProSport air rifle.

OX Springs are the worlds first Square Section air rifle mainsprings available to the public. Manufactured from Swedish High Content Chrome-Maganese – Carbon – Silicon – Tempered Spring steel, offering tensile strength in excess of 250,000 lbs per square inch.

Available in 2 versions:

Red – The original OX spring
Yellow – The most recent addition to the OX range. The OX Yellow is an ‘accelerator’ mainspring  which is Furnace Bake-Coated with MOLYBDENUM & PTFE for progressive lubrication & rapid acceleration. OX claim up to 40 per cent more compressed poundage than conventional mainsprings.

PLEASE NOTE: Fitting these springs to your rifle may cause local power limits to be exceeded. It is common practice to need to remove coils on a spring to meet power limits for a given country.