Bkreutz is correct to a point
Spring pin is a catagory which includes coil spring pins (the type used by S&W) & slotted spring pins which most people call roll pins. Here is a link that shows the pin used very clearly:
https://en.wikipedia.org/wiki/Spring_pin
I do a lot of work on AR's as well as M&P Pistols so I have a large collection of punches. I admit to being a tool junkie and have been collecting a long time. I never throw a damaged tool away and often modify them to suit a specific need. I shortened bent punches to make "starter" punches before I found them for sale.
I use starter punches designed for spring pins:
http://www.brownells.com/gunsmith-t...nches/roll-pin-starter-punches-prod20640.aspx
And then finish removing them with a proper sized pin punch.
When I reinstall the spring pins I use these:
http://www.brownells.com/gunsmith-t...h-tools/punches/roll-pin-holders-prod781.aspx
They really make installing spring pins easy. Understand I work on other peoples guns and they take a dim view of scratches caused by slipping punches so I really can't afford not to have the right tools.
One tool that I rely on since I discovered it is a Nupla Handi-Hammer. It gives me better control than anything I have ever used. Here is a link to show it:
[ame="http://www.amazon.com/Nupla-89714-Handi-Hammer-Handleless-Non-Marring/dp/B00GVKD9VK/ref=sr_1_1?s=hi&ie=UTF8&qid=1445813482&sr=1-1&keywords=nupla+handi-hammer"]Nupla 89714 Handi-Hammer Power Drive Heavy Duty Handleless Hammer with 1 Non-Marring Soft and Steel Face: Dead Blow Hammers: Amazon.com: Home Improvement@@AMEPARAM@@http://ecx.images-amazon.com/images/I/216o334pYnL.@@AMEPARAM@@216o334pYnL[/ame]
You will discover many things commonly miscalled in the gun world.... roll pins are actually spring pins and magazines are called clips. A Shield uses magazines, an M1 Garand uses clips. AR magazines can be loaded with stripper clips. A .357 Magnum and .38 Special both use the same diameter bullet.
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There is no such thing as a stupid question, just stupid mistakes caused because you didn't ask it.
Experiece is a difficult teacher, it gives the test before it gives the answer.
Read and ask away....if you get flamed by someone shrug it off and keep reading there are helpful & knowledgeable people here that enjoy helping. Most of us are eager to pass on the lessons we learned the hard way.