A rifle.
A gunsmith can assist you.
Ebay
about $200 new $150 typical
At Numrich gun parts : it is the same as a Squires Bingham 1600
it looks exactly like a vietnam era m16 in .22 caliber
Specs says 116 mph Personal testimony says 127 mph
Vollkswagen makes the MK1 Golf, which is a front wheel drive car. The company first made the Golf in 1974 and tried to compliment their very successful Volkswagen Beetle.
Please read your question over, and ask again- but a Mk1 No4 and a Mk1 No4.........???
There are many fireamrs that have Mk1 in their designation. Are you talking about a handgun or a long gun?
Yes.
That is a tough question. Those very nice little rifles were made in Italy by Fabrique Italiani Armi Sabatti, and imported by Kassnar. Kassnar went out of business, and Mr. Kassnar became the head of Charles Daly Firearms, which THEN went out of business. You might contact the original maker through their website in Italy. Absent that, I do not think there IS a source for a parts diagram. Your rifle is between 35-40 years old. Sorry-