I think the Gold Cup pistols all come stock (especially for a 70 series) with a standard GI guide rod setup.

Go to Brownell's and get a standard guide rod, a standard spring plug and a 16 - 18 lb spring (like Graves said). It'll just cost a few bucks and it'll make maintaining your gun much easier. And you can probably shoot anything you like through it.

I just talked to an elderly retired Navy man yesterday who lives in FL. He bought an old 1911 from me...a Colt made in 1915. He said he's had pretty much one of every type of 1911 ever made and his current collection is over 100 1911 pistols, almost all Colt military guns dating back to...1911. He was a fascinating man to talk to. He said in the 60s he had owned a Singer and a North American Arms...said he sold them both sometime in the mid 60s for a $1,000 to buy furnishings for his house and new bride after he got married. I can't even imagine what those two would be worth today.

Then he started talking about the old Harley's he's had...

Sorry for going off topic...he was just a neat old guy to talk to.