AR-15 Barrel Basics, Part 2

http://blog.cheaperthandirt.com/?p=72454%20/?utm_source=newsletter&utm_medium=social&utm_content=gzediker&utm_campaign=20141122-chronicle1122-ar15barrelbasicspt2

 

#AR-15, #AR15, #AR-40, #AR40, #AR-45, #AR45, #AR-9, #AR9, #AR-16, #AR16, #M-16, #M16,