I have visited many 2nd Amendment and Firearms-related websites that have lots of information.  Following are some that I like.  They are in no particular order and they are not exclusive, and they might have outdated info, etc.  They are just some that I have enjoyed visiting.  Maybe you have some sites to share as well. 

 

John Lott's Website - 2nd Amendment Powerhouse

 

The Truth About Guns - Awesome Gun Reviews

 

Mr. Completely

 

Randy Wakeman Outdoors - Shotguns and more

 

Chuckhawks.com - Informative site, there is a paid side as well

 

Personal Defense Network - Lots of self-defense info.

 

Alpharubicon.com - Lots of articles, and with a LEO focus

 

Gunner's Journal - 1911s and others ...

 

Xavier Thoughts - Personal Defense Stories and  more

 

Massad Ayoob on Guns - No intro needed

 

Hi Powers and Handguns - In depth info, especially about Browning Hi Powers

 

The Snubnose Files

http://backwoodshome.com/blogs/MassadAyoob/ - Massad Ayoob's column at Backwoods Home Journal - he's a bit more unfiltered there than some of his other "for general public consumption" writing.

 

http://onlygunsandmoney.blogspot.com/ - No Lawyers, Only Guns and Money - Light treatment of RKBA legal issues/cases

 

http://weaponsman.com/ - Weapons Man - RKBA legal issues, firearms/military/self defense technology and techniques. 

 

http://sipseystreetirregulars.blogspot.com/ - Sipsey Street Irregulars - Mike Vanderboegh's blog, boogeyman of the Anti's, "gathering place for III %'ers" -  Lots of RKBA politics and opinion. Surprised this one isn't on your list already, Underdog.

 

http://waronguns.blogspot.com- David Codrea's blog, RKBA news, politics and opinion pieces - annoying "click-baitish" post titles without much immediate content, but I find that clicking through to his actual articles (all seem to be from examiner.com) is usually worth the time.

 

http://www.forgottenweapons.com/ - Forgotten Weapons - best blog on historical weapons and tech that I've come across, fascinating reading.

 

http://www.washingtonpost.com/news/volokh-conspiracy/ - The Volokh Conspiracy - Blog of Eugene Volokh and other law professors - Not strictly RKBA oriented, but they do tend to cover lots of constitutional issues/cases/politics.  Heavy on legal issues and details.

 

http://www.thebangswitch.com/ - The Bang Switch - Blog of the Military Arms Channel (MAC) on youtube. Lots of great reviews, some news and politics.

 

http://ar15news.com - AR15 news, basically a blog for press releases on new AR products.  It gets tiring reading about how this new! gadget!! is the best!!!! EVAH!!!!!, but if you don't mind filtering through the hyperbole you'll find interesting new AR products and sometimes specials/sales.

This is one of my favorite, and has just about everything you can imagine. For a person who's a nerd for military weapons, it covers a lot of cool guns. It also goes into the history, and development (Including why some design choices were made.) They also cover a variety of topics that are good for someone such as myself who wasn't raised around guns. For instance, they have a good post on  different types of scopes, how they're made, how to use them, etc. Similarly with carry conditions and stuff.

http://firearmshistory.blogspot.com/search?updated-min=2015-01-01T00:00:00-08:00&updated-max=2016-01-01T00:00:00-08:00&max-results=15