MP15 jammed up - Page 2 - Gun Hub
Gun Hub

Go Back   Gun Hub > Battle Rifles > AR15

LinkBack Thread Tools Display Modes
Old 09-29-2013, 05:24 PM   #21
Senior Member
Join Date: Dec 2002
Posts: 1,428
I'm not 100% sure, but I think the current USGI cold weather lubricant is the standard issue G96 CLP that's issued for all other conditions.

CLP Breakfree is not THE official issue lube now but is allowed, and it's good down to 53 below.
dfariswheel is offline  
Old 09-30-2013, 01:54 AM   #22
Senior Member
Skeptic49's Avatar
Join Date: Mar 2006
Location: St. Augustine, FL
Posts: 2,482
I tried searching around PEO SOLDIER LIVE - Soldiers Are Our Strength And Purpose

But they seem a little slow at 0450 hours. If you have more time than us working stiffs, you might try some questions. Or their Twitter and other interactive systems.

Who is amazed at how difficult it is to get the simplest information.
Skeptic49 is offline  
Old 09-16-2015, 03:43 PM   #23
Junior Member
Join Date: Sep 2015
Location: florida
Posts: 1
got an S/W m&p 15 too. have no problems with it. very happy with it.
ventgunner is offline  
Old 09-17-2015, 12:52 PM   #24
Senior Member
Join Date: Dec 2004
Location: Northern Nevada
Posts: 5,678
The last I read was they were supposed to use the old LSA in the arctic, and CLP everywhere else. There's what's referred to as the "Gunny's Lube" which is a 50% mix of CLP and automatic transmission fluid which is reported to work very well in the sand. I think its not so much what you lubricate with in the sand, as it is to just lubricate. If you liberally apply 10w-40 motor oil you'll have very good results, and I imagine it would even work well in the arctic since 10w-40 is rated to something like -60 for automobiles.

You just want to be careful to keep the lubricant out of the chamber where it can make life unnecessarily exciting.
Kevin Gibson is offline  
Old 01-01-2016, 07:08 AM   #25
Senior Member
billt's Avatar
Join Date: May 2008
Location: Glendale, Arizona
Posts: 118
Try using Mobil 1 in 0W-20. It flows in the coldest weather, Run your gun VERY WET, (especially the bolt carrier group), and use a good, quality high end ammunition. I'm willing to bet your problems will disappear. Don't go by what soldiers in Iraq do or use. It has no bearing for civilians who shoot in the cold, wet woods of Oregon.
billt is offline  
Old 01-01-2016, 07:18 AM   #26
Senior Member
billt's Avatar
Join Date: May 2008
Location: Glendale, Arizona
Posts: 118
This is a good guide to follow when lubricating most direct impingement AR-15 platform weapons. In the case of most AR's, more lube is better than less. Simply because the direct impingement gas operation of the weapon tends to blow excess lubricant out the ejection port over a period of just a few rounds.

"L" means lightly lubricate. "1" means 1 drop. "G" means use a generous amount.

billt is offline  
Old 01-01-2016, 05:09 PM   #27
Senior Member
Join Date: Sep 2005
Posts: 2,541
I'm going to admit up front I have little experience with the AR system in sand. Having said that, one of the things that has always puzzled me is that after 40+ years, lubrication of the system has so many variants flying about.

Whats worked for me since 1970 or so is lubrication almost per the drawing bilt included. Especially if using conventional oil based lubes, don't lube the firing pin, gas rings or the gas chamber area of the carrier as it will form carbon when exposed to combustion gases. I've used Mil-Tec, LSA and Dri-Slide with good results, I prefer the Dri-Slide. Now that I've got my own, I generally use a little dab of moly chassis lube on the cam pin area of the carrier and the rear of the bolt locking lugs. What you use seems to be less important than regularity.

The only thing that requires regular lube on the lower is the trigger mechanism. The rest of that stuff is an occasional thing, largely dependent upon weather.

BTW, in my experience "wet" shouldn't mean sopping, dripping lubricant.

My former employer bought oodles of the M&P15 and they work right along with the older Colts with a much better warranty.

Last edited by William R. Moore; 01-01-2016 at 05:12 PM.
William R. Moore is offline  
Old 01-02-2016, 01:59 PM   #28
Senior Member
Hummer's Avatar
Join Date: Feb 2007
Location: South Carolina
Posts: 1,186
1. never use graphite on anything, anytime, anywhere. It is erosive in dry atmosphere. Correction make that very erosive. Question: If graphite is such a great lubricant why is it used in brake shoes? Why do brakes fail after running through puddles? Because they are wet and wet graphite is nice and slick.
2. LSA is good to about ZERO
3. At Aberdeen Proving Ground the only lubricant that worked at 50 below zero was LAW Lubricant Arctic Weapons

I suspect Mobil 1 0W20 would work to around 40 below zero. Maybe some of the guys from Alaska can enlighten us on Mobil 1 below zero.

My personal lubes are Ed's Red, make it yourself. 1/3 Mercon Dexron Trans Fluid, 1/3 K1 Kerosene (I have used off road diesel), 1/3 mineral spirits or paint thinner.

The other is Mobil 1 and I have used 0W20, 0W30 and 5W20 with good results in ambient temps.

Insofar as the original problem goes tends to sound like a pitted chamber or a rust build up. I would not shoot steel case ammo but its your rifle.

Do you have access to another lower? If so try your upper on that lower and the other upper on yours.

Does it malfunction with white box commercial Federal?

Check for galling in the bolt carrier where the pin slides in the channel.

The M16 was tested to operate bone dry for 600 rounds at Aberdeen many times.

Last edited by Hummer; 01-02-2016 at 02:14 PM.
Hummer is offline  
Old 01-07-2016, 07:15 AM   #29
Senior Member
Join Date: Dec 2004
Location: Northern Nevada
Posts: 5,678
The reason steel case has problems in AR carbines comes down to gas port pressure and the fact that steel is less ductile than brass. Most full length AR rifles work much better with steel cases because the pressure on the case walls is 4-6kpsi lower than the carbine's short gas system.
Kevin Gibson is offline  
Old 01-07-2016, 07:44 AM   #30
Senior Member
shep854's Avatar
Join Date: Dec 2004
Location: Birmingham AL
Posts: 2,168
One theory, discussed here, is that steel cases do not damage a rifle, but allow fouling to flow into the chamber, which can lead to increased case sticking as compared to brass:

shep854 is offline  

  Gun Hub > Battle Rifles > AR15

Search tags for this page
how to clesr a jammed m&p15
jammed s&w 15
m&p 15 bolt direction
m&p ar15 jammed

mp15 bolt jammed

shimming an m&p 15
smith & wesson m&p ar 15 bolt jammed in barrel
smith and wesson m&p 15 bolt stuck
smith and wesson m&p ar 15 sport bolt locked
Click on a term to search for related topics.

Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
jammed case & torn extractor El Capitan M14 5 06-15-2009 11:41 AM
Swapping S&W MP15 Collapsible stock--Any secrets? Amanda4461 AR15 8 05-03-2009 09:30 PM
Trade Good Deal ? S&W MP15 for Springfield MC Operator usmc-nav Handguns 3 03-06-2008 08:10 PM
MP15: S&W to Roll Out AR-15 Rifles LIProgun Gun Talk 41 02-14-2006 03:30 AM

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Copyright © 2002 - 2021 Gun Hub. All rights reserved.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.