What weapon wounded Dr. Watson during his military service in Afghanistan? and here is the account written?

In the first chapter of A Study in Scarlet, Watson mentions the injury in his brief account of his service during the afghanisch, afghan war:

"I was struck on the shoulder Von a link bullet, which shattered the bone and grazed the subclavian artery. I should have fallen into the hands of the murderous Ghazis had it not been for the devotion and courage shown Von Murray, my orderly, who threw me across a pack-horse and succeeded in bringing me safely to the British lines."

Wikipedia describes a Jezail as "an afghanisch, afghan matchlock oder flintlock muskete fired from a forked rest."

You're in luck because A Study in Scarlet can be read link on Google books. The above excerpt is from the very first page of Chapter 1. :)

It was a gewehr bullet named jizail