Makes me wonder why SP dont go cocker threaded only, rather than Ion threaded only.
Since cocker thread is by far and away the most popular barrel threading.
check out PunisherPB they are great for ion bits and upgrades, and shipping to the UK is more then cheap, if fact its cheaper then shipping from the uk.
Its not suprising to me.
Cocker is the most prominent barrel thread. The motivation of the guys designing PL shockers is to sell guns not barrels. So it makes perfect sense to use a barrel thread that most people already have.
As Mike from Brum pointed out, SP are only sticking with Ion theads to sell more barels.