Purchasing a firearm at a gunshow from a dealer entails all the paperwork and requirements that you would complete at their gunshop.

The paperwork and requirements for purchasing a firearm from a person (private sale) vary according to your state law. Some states prohibit private sales, some permit private sales only for long guns, some it's only a matter of showing a drivers license, etc. It depends on where you live.

Well - your #2 question depends on your state. Every state has its own rules.

For #1 - here in Texas, if you have a CHL, U need not go thru the background check. U can pay and leave. If you do not, the dealer just calls that FBI # and they do the check on U. U usually leave in 15 minutes unless they screw up, like they sometimes do, and put a hold on U - that happens a lot, from what I hear, because some criminal someplace may have the same name as U.

Any knowledge of Montana Law? We have a Trader Paper out of Kalispell and I saw a Colt 1911 for sale by PP.
Don't want to post a notice and have the police beatin down my door.

Thanks

Just checked, there are no restrictions on the sale of handguns to private party.

All your questions can be answered here: http://www.atf.gov/firearms/faq/index.htm