Archive for the 'AR-15s' Category



Combat Rifle Zero

BY Herschel Smith
1 month, 2 weeks ago

John Lovell has an interesting video up on AR-15 zero.

If you want more, and a somewhat different approach, Shawn Ryan has a video up of his 36 yard zero and why he does it that way.

6000 Rounds With No Cleaning

BY Herschel Smith
1 month, 3 weeks ago

MAC continues the BCM AR-15 testing.

Checking The AR-15 Firing Pin Protrusion

BY Herschel Smith
2 months ago

I do find his videos very helpful and instructive.

Why Did The U.S. Military Switch From 7.62x51mm To 5.56x45mm Cartridges?

BY Herschel Smith
2 months ago

We Are The Mighty.

Ultimately, the decision to shift from 7.62x51mm ammunition to 5.56x45mm came down to simple arithmetic. The smaller rounds weighed less, allowing troops to carry more ammunition into the fight. They also created less recoil, making it easier to level the weapon back onto the target between rounds and making automatic fire easier to manage. Tests showed that troops equipped with smaller 5.56mm rounds could engage targets more efficiently and effectively than those firing larger, heavier bullets.

As they say in Marine Corps rifle teams, the goal is to locate, close with, and destroy the enemy — and the 5.56mm NATO round made troops better at doing precisely that.

I include this not to start another caliber war, but to link up the PDF document, “Rifle Squad Armed With Armed With A Light Weight High Velocity Rifle.”

I had never seen that before and thought readers might find it interesting.

More On Kneeling Positions While Running An AR-15

BY Herschel Smith
2 months, 1 week ago

With Chris Costa. I would only find this position comfortable with knee pads.

MSR Shooting Tips, Reverse Kneeling Position

BY Herschel Smith
2 months, 1 week ago

Replacing The AR-15 Dust Cover Without Removing The Barrel Nut

BY Herschel Smith
2 months, 1 week ago

I found this to be a useful video.  I enjoy and benefit from videos like this where an operation that could be complex is taken apart into its parts and explained thoroughly, with tricks of the trade explained.

Full Auto Versus Semi Auto AR-15

BY Herschel Smith
2 months, 1 week ago

Thoughts On Barrel Twist, Bullet Weight And Precision

BY Herschel Smith
2 months, 3 weeks ago

Shooting Illustrated had an assessment of the Barnes Precision Carbine.  It seems a nice enough gun, although for the price you’re getting into BCM and Rock River Arms prices.  I do like the looks of the hand guard, though.  But what caught my eye was this chart.

I find this fascinating.  I’m a wonk, I admit.  But even if you don’t find it as interesting as I do, I’d request that you [a] see this first and foremost as a fishing expedition, not a tutorial (because that’s not my job), and [b] keep track of similar data and send to me as you run across it.

So here’s my specific interest.  Technically, MOA is a measure of precision, not accuracy.  Accuracy can be modified based on sight (or optic) adjustments.  If you don’t understand the difference between accuracy and precision, without going through the mathematics of the Central Limit Theorem, you can see this article.  So now you’ll understand why I am using the term precision for this information.

The precision is lower for the 62 grain bullets than for 55 grain or 73 grain.  It would have been nice to see additional testing with Sierra MatchKing 77 grain OTM.  The difference above is nontrivial.

We saw in a previous post (not because I knew this information, but because I know how to find this information) that when the Army tested the M855A1 round, they were using accurized 1:8 twist barrels, not 1:7 twist as per MilSpec.  They got worse precision with the new ammunition with 1:7 twist barrels.  The M856 tracer round is 63.7 grains, and the Army had to show that the barrel could stabilize the round in order to justify the new bullet.

A twist rate that is too high can over-stabilize bullets, leading to “keyholing.”  We know that, and so it’s important not to overdo barrel twist.  It is fairly standard knowledge that use of the 1:7 twist leads to slightly less precision for the 55 grain, and maybe for the 62 grain green tip.  But it manages to stabilize the heavier rounds, including the rounds that are apparently in current use within SpecOps.

This stabilization is necessary because of changes made to the service rifle.  The original M-16 had a much milder twist rate than does the shorter barrels in use today.  The shorter barrels are a direct result of trouble getting into and out of vehicles for dismounted operations, going through buildings and around walls, and the general requirements of MOUT.  In order to make the ammunition work for these shorter barrels, the engineers had to monkey around with twist.

Now I’m to my main point.  I take interest in the fact that the precision is lower for the medium weight bullets.  I’ll stipulate that the variables are many, including perhaps the most important one, barrel harmonics.  I’d love to talk to some of the original engineers and test shooters for the newest Army round, but it’s likely that I’d never get the truth.

But what I can do is compile data of my own.  I’m wondering if this behavior stands up with other twist rates?  I’m also interested in whether barrel length plays a role.  Why did the precision decrease with medium weight bullets, and recover at the lower and higher ends?

At any rate, if you run across any data for 1:9 twist, 1:8 twist, or any more data on 1:7 twist, using different bullet weights, I’d be very interested to learn the precision of the groups and plot for future reference.

Thanks in advance.

Rifle Drills

BY Herschel Smith
3 months ago

Shooting Illustrated.

I guess we all learned to shoot watching old movies because most folks emulate the actors and bring the rifle down off the shoulder, especially to run a bolt or lever. This practice wastes time and encourages failing to follow through, that is, re-acquiring the sight or the reticle after the shot. We should run the gun from the shoulder and be ready for the next shot as needed, and this takes a bit of practice. You can drill this by doing dry practice then setting up a target at 25 yards and firing a string of 3 to 5 shots, standing, working the gun from the shoulder.

I’m not certain what he’s saying here.  If he’s saying that you must shoot a bolt action rifle differently than an AR, I agree.

If he’s saying that the “plate-forward aggressive” stance for an AR must be corrected, I disagree.  I think his explanation could have used some work.  And I didn’t learn to square up against a target with an AR from watching movies.


26th MEU (10)
Abu Muqawama (12)
ACOG (2)
ACOGs (1)
Afghan National Army (36)
Afghan National Police (17)
Afghanistan (679)
Afghanistan SOFA (4)
Agriculture in COIN (3)
AGW (1)
Air Force (35)
Air Power (9)
al Qaeda (83)
Ali al-Sistani (1)
America (19)
Ammunition (96)
Animals (58)
Ansar al Sunna (15)
Anthropology (3)
Antonin Scalia (1)
AR-15s (215)
Arghandab River Valley (1)
Arlington Cemetery (2)
Army (74)
Assassinations (2)
Assault Weapon Ban (27)
Australian Army (6)
Azerbaijan (4)
Backpacking (2)
Badr Organization (8)
Baitullah Mehsud (21)
Basra (17)
BATFE (87)
Battle of Bari Alai (2)
Battle of Wanat (18)
Battle Space Weight (3)
Bin Laden (7)
Blogroll (2)
Blogs (17)
Body Armor (18)
Books (3)
Border War (11)
Brady Campaign (1)
Britain (38)
British Army (35)
Camping (4)
Canada (2)
Castle Doctrine (1)
Caucasus (6)
CENTCOM (7)
Center For a New American Security (8)
Charity (3)
China (10)
Christmas (11)
CIA (28)
Civilian National Security Force (3)
Col. Gian Gentile (9)
Combat Outposts (3)
Combat Video (2)
Concerned Citizens (6)
Constabulary Actions (3)
Coolness Factor (2)
COP Keating (4)
Corruption in COIN (4)
Council on Foreign Relations (1)
Counterinsurgency (216)
DADT (2)
David Rohde (1)
Defense Contractors (2)
Department of Defense (151)
Department of Homeland Security (24)
Disaster Preparedness (4)
Distributed Operations (5)
Dogs (12)
Donald Trump (25)
Drone Campaign (3)
EFV (3)
Egypt (12)
El Salvador (1)
Embassy Security (1)
Enemy Spotters (1)
Expeditionary Warfare (17)
F-22 (2)
F-35 (1)
Fallujah (17)
Far East (3)
Fathers and Sons (2)
Favorite (1)
Fazlullah (3)
FBI (31)
Featured (180)
Federal Firearms Laws (18)
Financing the Taliban (2)
Firearms (1,090)
Football (1)
Force Projection (35)
Force Protection (4)
Force Transformation (1)
Foreign Policy (27)
Fukushima Reactor Accident (6)
Ganjgal (1)
Garmsir (1)
general (15)
General Amos (1)
General James Mattis (1)
General McChrystal (43)
General McKiernan (6)
General Rodriguez (3)
General Suleimani (9)
Georgia (19)
GITMO (2)
Google (1)
Gulbuddin Hekmatyar (1)
Gun Control (1,205)
Guns (1,592)
Guns In National Parks (3)
Haditha Roundup (10)
Haiti (2)
HAMAS (7)
Haqqani Network (9)
Hate Mail (8)
Hekmatyar (1)
Heroism (4)
Hezbollah (12)
High Capacity Magazines (14)
High Value Targets (9)
Homecoming (1)
Homeland Security (1)
Horses (1)
Humor (24)
ICOS (1)
IEDs (7)
Immigration (88)
India (10)
Infantry (4)
Information Warfare (2)
Infrastructure (2)
Intelligence (23)
Intelligence Bulletin (6)
Iran (170)
Iraq (379)
Iraq SOFA (23)
Islamic Facism (62)
Islamists (92)
Israel (18)
Jaish al Mahdi (21)
Jalalabad (1)
Japan (2)
Jihadists (80)
John Nagl (5)
Joint Intelligence Centers (1)
JRTN (1)
Kabul (1)
Kajaki Dam (1)
Kamdesh (9)
Kandahar (12)
Karachi (7)
Kashmir (2)
Khost Province (1)
Khyber (11)
Knife Blogging (4)
Korea (4)
Korengal Valley (3)
Kunar Province (20)
Kurdistan (3)
Language in COIN (5)
Language in Statecraft (1)
Language Interpreters (2)
Lashkar-e-Taiba (2)
Law Enforcement (3)
Lawfare (7)
Leadership (6)
Lebanon (6)
Leon Panetta (2)
Let Them Fight (2)
Libya (14)
Lines of Effort (3)
Littoral Combat (8)
Logistics (50)
Long Guns (1)
Lt. Col. Allen West (2)
Marine Corps (259)
Marines in Bakwa (1)
Marines in Helmand (67)
Marjah (4)
MEDEVAC (2)
Media (44)
Memorial Day (5)
Mexican Cartels (35)
Mexico (49)
Michael Yon (5)
Micromanaging the Military (7)
Middle East (1)
Military Blogging (26)
Military Contractors (4)
Military Equipment (24)
Militia (5)
Mitt Romney (3)
Monetary Policy (1)
Moqtada al Sadr (2)
Mosul (4)
Mountains (25)
MRAPs (1)
Mullah Baradar (1)
Mullah Fazlullah (1)
Mullah Omar (3)
Musa Qala (4)
Music (21)
Muslim Brotherhood (6)
Nation Building (2)
National Internet IDs (1)
National Rifle Association (69)
NATO (15)
Navy (22)
Navy Corpsman (1)
NCOs (3)
News (1)
NGOs (2)
Nicholas Schmidle (2)
Now Zad (19)
NSA (3)
NSA James L. Jones (6)
Nuclear (57)
Nuristan (8)
Obama Administration (221)
Offshore Balancing (1)
Operation Alljah (7)
Operation Khanjar (14)
Ossetia (7)
Pakistan (165)
Paktya Province (1)
Palestine (5)
Patriotism (7)
Patrolling (1)
Pech River Valley (11)
Personal (60)
Petraeus (14)
Pictures (1)
Piracy (13)
Pistol (2)
Pizzagate (21)
Police (452)
Police in COIN (3)
Policy (15)
Politics (504)
Poppy (2)
PPEs (1)
Prisons in Counterinsurgency (12)
Project Gunrunner (20)
PRTs (1)
Qatar (1)
Quadrennial Defense Review (2)
Quds Force (13)
Quetta Shura (1)
RAND (3)
Recommended Reading (14)
Refueling Tanker (1)
Religion (173)
Religion and Insurgency (19)
Reuters (1)
Rick Perry (4)
Rifles (1)
Roads (4)
Rolling Stone (1)
Ron Paul (1)
ROTC (1)
Rules of Engagement (75)
Rumsfeld (1)
Russia (30)
Sabbatical (1)
Sangin (1)
Saqlawiyah (1)
Satellite Patrols (2)
Saudi Arabia (4)
Scenes from Iraq (1)
Second Amendment (311)
Second Amendment Quick Hits (2)
Secretary Gates (9)
Sharia Law (3)
Shura Ittehad-ul-Mujahiden (1)
SIIC (2)
Sirajuddin Haqqani (1)
Small Wars (72)
Snipers (9)
Sniveling Lackeys (2)
Soft Power (4)
Somalia (8)
Sons of Afghanistan (1)
Sons of Iraq (2)
Special Forces (28)
Squad Rushes (1)
State Department (21)
Statistics (1)
Sunni Insurgency (10)
Support to Infantry Ratio (1)
Supreme Court (6)
Survival (29)
SWAT Raids (55)
Syria (38)
Tactical Drills (2)
Tactical Gear (4)
Taliban (167)
Taliban Massing of Forces (4)
Tarmiyah (1)
TBI (1)
Technology (17)
Tehrik-i-Taliban (78)
Terrain in Combat (1)
Terrorism (95)
Thanksgiving (9)
The Anbar Narrative (23)
The Art of War (5)
The Fallen (1)
The Long War (20)
The Surge (3)
The Wounded (13)
Thomas Barnett (1)
Transnational Insurgencies (5)
Tribes (5)
TSA (20)
TSA Ineptitude (12)
TTPs (3)
U.S. Border Patrol (5)
U.S. Border Security (14)
U.S. Sovereignty (17)
UAVs (2)
UBL (4)
Ukraine (3)
Uncategorized (56)
Universal Background Check (3)
Unrestricted Warfare (4)
USS Iwo Jima (2)
USS San Antonio (1)
Uzbekistan (1)
V-22 Osprey (4)
Veterans (3)
Vietnam (1)
War & Warfare (221)
War & Warfare (40)
War Movies (4)
War Reporting (19)
Wardak Province (1)
Warriors (6)
Waziristan (1)
Weapons and Tactics (64)
West Point (1)
Winter Operations (1)
Women in Combat (21)
WTF? (1)
Yemen (1)

February 2020
January 2020
December 2019
November 2019
October 2019
September 2019
August 2019
July 2019
June 2019
May 2019
April 2019
March 2019
February 2019
January 2019
December 2018
November 2018
October 2018
September 2018
August 2018
July 2018
June 2018
May 2018
April 2018
March 2018
February 2018
January 2018
December 2017
November 2017
October 2017
September 2017
August 2017
July 2017
June 2017
May 2017
April 2017
March 2017
February 2017
January 2017
December 2016
November 2016
October 2016
September 2016
August 2016
July 2016
June 2016
May 2016
April 2016
March 2016
February 2016
January 2016
December 2015
November 2015
October 2015
September 2015
August 2015
July 2015
June 2015
May 2015
April 2015
March 2015
February 2015
January 2015
December 2014
November 2014
October 2014
September 2014
August 2014
July 2014
June 2014
May 2014
April 2014
March 2014
February 2014
January 2014
December 2013
November 2013
October 2013
September 2013
August 2013
July 2013
June 2013
May 2013
April 2013
March 2013
February 2013
January 2013
December 2012
November 2012
October 2012
September 2012
August 2012
July 2012
June 2012
May 2012
April 2012
March 2012
February 2012
January 2012
December 2011
November 2011
October 2011
September 2011
August 2011
July 2011
June 2011
May 2011
April 2011
March 2011
February 2011
January 2011
December 2010
November 2010
October 2010
September 2010
August 2010
July 2010
June 2010
May 2010
April 2010
March 2010
February 2010
January 2010
December 2009
November 2009
October 2009
September 2009
August 2009
July 2009
June 2009
May 2009
April 2009
March 2009
February 2009
January 2009
December 2008
November 2008
October 2008
September 2008
August 2008
July 2008
June 2008
May 2008
April 2008
March 2008
February 2008
January 2008
December 2007
November 2007
October 2007
September 2007
August 2007
July 2007
June 2007
May 2007
April 2007
March 2007
February 2007
January 2007
December 2006
November 2006
October 2006
September 2006
August 2006
July 2006
June 2006
May 2006

about · archives · contact · register

Copyright © 2006-2020 Captain's Journal. All rights reserved.