By EILEEN SULLIVAN
WASHINGTON (AP) - Military-style assault weapons, gangster-style Tommy guns, World War II-era bazookas and even sawed-off shotguns _ somewhere in the U.S., there is a legal avenue to get each of those firearms and more.
This is thanks to the maze of gun statutes around the country and the lack of a minimum federal standard to raise the bar for gun control in states with weak laws.
An Associated Press analysis found that there are thousands of laws, rules and regulations at the local, county, state and federal levels. The laws and rules vary by state, and even within states, according to a 2011 compilation of state gun laws by the Bureau of Alcohol, Tobacco, Firearms and Explosives.
These laws and regulations govern who can carry a firearm, what kind of firearm is legal, the size of ammunition magazines and more. In some places, a person can buy as many guns as desired.
This maze of laws undermines gun-control efforts in communities with tougher gun laws _ and pushes advocates of tighter controls to seek a federal standard. Gun rights proponents say enforcing all existing laws makes more sense than passing new ones.
"If you regulate something on the local or state level, you are still a victim to guns coming into other localities or states," said Laura Cutilletta, a senior staff attorney at the California-based Law Center to Prevent Gun Violence.
In California, most guns come from Nevada, where there is almost no regulation of firearms, Cutilletta said, and in Arizona, gun owners don't need a permit.
President Barack Obama earlier this month announced a $500 million plan to tighten federal gun laws. The December shooting massacre in Newtown, Conn., that killed 20 children and six adults at an elementary school launched the issue of gun control policy to a national focus not seen in decades.
Obama is urging Congress to pass new laws, some of which would set a minimum standard for the types of firearms and ammunition that are commercially available. Democratic Sens. Patrick Leahy of Vermont and Dianne Feinstein of California introduced new proposals this week to increase penalties for firearms trafficking and impose a new assault weapons ban.
The powerful gun lobby says the problem lies in enforcement of existing laws.
"Which begs the question: Why are we putting more laws on the books if we're not enforcing the laws we already have on the books?" said Andrew Arulanandam, spokesman for the National Rifle Association.
New gun laws will face tough opposition in Congress, particularly from members who rely on the NRA during election campaigns. The NRA contributed more than $700,000 to members of Congress during the 2012 election cycle, according to the Center for Responsive Politics.
Recognizing the opposition in Congress, states already are passing their own new gun laws while officials from some states are promising to ignore any new federal mandates. As the national debate on gun control and Second Amendment rights escalates, the terms being used won't mean the same thing everywhere, due to the thousands of laws, rules and regulations across the country.
"The patchwork of laws in many ways means that the laws are only as effective as the weakest law there is," said Gene Voegtlin of the International Association of Chiefs of Police. "Those that are trying to acquire firearms and may not be able to do that by walking into their local gun shop will try to find a way to do that. This patchwork of laws allows them to seek out the weak links and acquire weapons."
Obama wants to address this, in part, by passing federal gun-trafficking laws that carry heavy penalties. It's difficult to crack down on trafficking because the penalties are too low to serve as a deterrent, and federal prosecutors decline many cases because of a lack of evidence. For instance, in order to charge someone with willfully participating in a business of selling firearms without a license, the ATF needs to prove that the guns were not sold out of the suspect's private collection, the Justice Department inspector general has said.
Obama has also called for a new federal law banning magazines that carry more than 10 rounds of ammunition _ a measure that was in effect during the previous assault weapons ban, between 1994 and 2004. High-capacity magazines have been used in recent deadly mass shootings, including those in Newtown, and in the suburban Denver movie theater attack last summer.
But like many terms in the firearm lexicon, a high-capacity ammunition magazine means different things in different places.