Some of the research finding a drop in violent crime rates from Right-to-carry laws

A 2012 survey of the literature is available here.

The Effect of Concealed Weapons Laws: An Extreme Bound Analysis by William Alan Bartley and Mark A Cohen, published in Economic Inquiry, April 1998 (Copy available here)

Criminal Deterrence, Geographic Spillovers, and Right-to-Carry Concealed Handguns by Stephen Bronars and John R. Lott, Jr., American Economic Review, May 1998

The Impact of Gun Laws on Police Deaths by David Mustard, published in the Journal of Law and Economics, October 2001

Privately Produced General Deterrence By BRUCE L. BENSON AND BRENT D. MAST, published in the Journal of Law and Economics, October 2001

Does the Right to Carry Concealed Handguns Deter Countable Crimes? Only a Count Analysis Can Say By FLORENZ PLASSMANN AND T. NICOLAUS TIDEMAN, published in the Journal of Law and Economics, October 2001

Testing for the Effects of Concealed Weapons Laws: Specification Errors and Robustness By CARLISLE E. MOODY, published in the Journal of Law and Economics, October 2001

Safe-Storage Gun Laws: Accidental Deaths, Suicides, and Crime By JOHN R. LOTT, JR., AND JOHN E. WHITLEY, published in the Journal of Law and Economics, October 2001

Right-to-Carry Concealed Weapon Laws and Homicide in Large U.S. Counties: The Effect on Weapon Types, Victim Characteristics, and Victim-Offender Relationships By DAVID E. OLSON AND MICHAEL D. MALTZ, published in the Journal of Law and Economics, October 2001

The Impact of Banning Juvenile Gun Possession By Thomas B. Marvell, published in the Journal of Law and Economics, October 2001

Measurement Error in County-Level UCR Data by John R. Lott, Jr. and John Whitley, published in the Journal of Quantitative Criminology, June 2003, Volume 19, Issue 2, pp 185-198

Confirming More Guns, Less Crime by Florenz Plassmann and John Whitley, published in the Stanford Law Review, 2003

Using Placebo Laws to Test “More Guns, Less Crime” by Eric Helland and Alexander Tabarrok, published in Advances in Economic Analysis and Policy, 4 (1): Article 1, 2004

Multiple Victim Public Shootings, Bombings, and Right-to-Carry Concealed Handgun Laws: Contrasting Private and Public Law Enforcement By John R. Lott, Jr. and William Landes, published in The Bias Against Guns

More Readers of Gun Magazines, But Not More Crimes by Florenz Plassmann and John R. Lott, Jr.

"The Debate on Shall-Issue Laws” by Carlisle e. Moody, Thomas B. Marvell, Paul R Zimmerman, and Fasil Alemante published in Review of Economics & Finance, 2014

"An examination of the effects of concealed weapons laws and assault weapons bans on state-level murder rates” by Mark Giusa published in Applied Economics Letters, Volume 21, Issue 4, 2014

More Guns, Less Crime: A Response to Ayres and Donohue's 1999 book review in the American Law and Economics Review by John R. Lott, Jr.

Right-to-Carry Laws and Violent Crime Revisited: Clustering, Measurement Error, and State-by-State Break downs by John R. Lott, Jr.

Crime, Deterrence, and Right-to-Carry Concealed Handguns by John R. Lott, Jr. and David B. Mustard published in the Journal of Legal Studies

"The Debate on Shall-Issue Laws” by Carlisle e. Moody and Thomas B. Marvell, published in Econ Journal Watch, volume 5, number 3, September 2008

"The Debate on Shall Issue Laws, Continued” by Carlisle e. Moody and Thomas B. Marvell, published in Econ Journal Watch, Volume 6, Number 2 May 2009

"Did John Lott Provide Bad Data to the NRC? A Note on Aneja, Donohue, and Zhang” by Carlisle e. Moody, John R Lott, Jr, and Thomas B. Marvell, published in Econ Journal Watch, Volume 10, Number 1, January 2013

For the data errors in the one published paper by Aneja, Donohue, and Zhang that claims to find a bad effect from right-to-carry laws on aggravated assaults see this paper.

In addition, Aneja, Donohue, and Zhang have retracted their original claim that the my research could not be replicated. Their argument was that Aneja, Donohue, and Zhang could not replicate the replication work done by the National Research Council that had replicated my research. In an Erratum note published in October 2012 they concede: "Subsequent to the publication of this article, members of the NRC panel demonstrated to the authors that the results in question were replicable if the authors used the data and statistical models described in Chapter 6 of the NRC (2004) report."

For additional discussions on the impact of right-to-carry laws see:

Crime Prevention Research Center