BCG question

frigate88 · March 7, 2012, 11:17 AM

Just picked up a bushmaster off this old man for pretty much nothing. When I was checking it out I pulled the bcg out and he had it lubed with grease. Never seen that. I never use grease in any of my AR's. Does any one else do that or seen it? I somewhat remember reading something like this, but not quite sure if it was in an AR.

BigJerm79 · March 7, 2012, 11:30 AM

I'm not much help since I don't have an AR, BUT it sounds like people DO use grease. It's talked about in the "AR15 Chamber" thread...just a few threads down from yours.

J

Crow Hunter · March 7, 2012, 11:32 AM

I used to use wheel bearing grease. Until I was shooting in really cold weather. (for us anyway

)

A little bit of grease came off the cam pin and it slowed down the firing pin travel enough that it wouldn't ignite the primers on XM193.

It took me about 15 min of sticking the FP in and taking it out and wiping it off to get enough of it gone that the rounds would ignite. I never had that happen in warmer weather.

I don't use grease now on ARs.

I just use CLP or motor oil.

Slip EWL is highly recommended by people who know more than me, but I have never used it.

frigate88 · March 7, 2012, 11:45 AM

That's what I was concerned about was the grease blocking the firing pin. I'll leave it and see what happens when I take it out for our first date.

.

Hansam · March 7, 2012, 11:54 AM

I grease the BCG but its only very lightly greased. Basically I apply the grease then wipe it down till I can barely feel the presence of the grease. Thousands of rounds through my AR rifles and no problems with it regardless of weather conditions.

Crow Hunter · March 7, 2012, 12:07 PM

Quote:

I grease the BCG but its only very lightly greased. Basically I apply the grease then wipe it down till I can barely feel the presence of the grease. Thousands of rounds through my AR rifles and no problems with it regardless of weather conditions.

I think I got sloppy putting it on and a glob got into the hole through the cam pin and I didn't notice it. I still sometimes put some grease on the BCG rails, but I don't use it to lube the BCG internals.

**Mike Irwin** · March 7, 2012, 12:27 PM

BCG?

Que?

I've got an AR, but I have no clue what the BCG is...

RT · March 7, 2012, 12:30 PM

Bolt Carrier Group.

Clean the grease off and drench it in CLP, or Slip 2000, or Mobil 1. Save the grease for a Garand

btmj · March 7, 2012, 12:39 PM

It seems there are a lot of different approaches and techniques for lubricating an AR-15..... And most seem to work. The common theme seems to be that the weapon will function as long as there is some lube, of some kind, on the BCG bearing (sliding) surfaces, the cam pin, the locking lugs, and the gas rings.

A fair number of people do use grease. If grease did not work, people would not use it. However.....

Crow Hunter's experience with cold weather is very informative. If I was going to use a grease, I would do what he did and verify my weapon's capability at low temperature..... which is why I use CLP. It may not be the best, but it has been battle tested for many years by hundreds of thousands of soldiers and marines.

TacticalDefense1911 · March 7, 2012, 01:26 PM

This should help. http://m4carbine.net/showthread.php?t=35490

**Mike Irwin** · March 7, 2012, 01:59 PM

Oh. OK.

Uhm... I knew that.... yeah....

Thanks!

frigate88 · March 7, 2012, 10:35 PM

Oh silly mikey

Tac-defence
Thanks, that link was really informative for me.

madcratebuilder · March 8, 2012, 09:13 AM

Quote:

Originally Posted by Mike Irwin

Oh. OK.

Uhm... I knew that.... yeah....

Thanks!

Mike, was that your first senior moment? Heck, I have them every day!

I use either Tetra grease or Lubriplate 135A on the bolt carrier rails that contact the upper receiver. In cold weather I stiffen up and stop functioning before the gun does.

March 7, 2012, 11:17 AM	#1
frigate88 Senior Member Join Date: June 30, 2011 Location: LOXAHATCHEE, FL Posts: 204	BCG question Just picked up a bushmaster off this old man for pretty much nothing. When I was checking it out I pulled the bcg out and he had it lubed with grease. Never seen that. I never use grease in any of my AR's. Does any one else do that or seen it? I somewhat remember reading something like this, but not quite sure if it was in an AR.

March 7, 2012, 11:32 AM	#3
Crow Hunter Senior Member Join Date: January 27, 2012 Posts: 1,078	I used to use wheel bearing grease. Until I was shooting in really cold weather. (for us anyway) A little bit of grease came off the cam pin and it slowed down the firing pin travel enough that it wouldn't ignite the primers on XM193. It took me about 15 min of sticking the FP in and taking it out and wiping it off to get enough of it gone that the rounds would ignite. I never had that happen in warmer weather. I don't use grease now on ARs. I just use CLP or motor oil. Slip EWL is highly recommended by people who know more than me, but I have never used it.

March 7, 2012, 12:27 PM	#7
Mike Irwin Staff Join Date: April 14, 2000 Location: Northern Virginia Posts: 41,642	BCG? Que? I've got an AR, but I have no clue what the BCG is... __________________ "The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza Baby Jesus cries when the fat redneck doesn't have military-grade firepower.

March 7, 2012, 01:59 PM	#11
Mike Irwin Staff Join Date: April 14, 2000 Location: Northern Virginia Posts: 41,642	Oh. OK. Uhm... I knew that.... yeah.... Thanks! __________________ "The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza Baby Jesus cries when the fat redneck doesn't have military-grade firepower.

March 7, 2012, 11:30 AM	#2
BigJerm79 Member Join Date: September 30, 2010 Location: Bay Area Posts: 53	I'm not much help since I don't have an AR, BUT it sounds like people DO use grease. It's talked about in the "AR15 Chamber" thread...just a few threads down from yours. J

March 7, 2012, 11:45 AM	#4
frigate88 Senior Member Join Date: June 30, 2011 Location: LOXAHATCHEE, FL Posts: 204	That's what I was concerned about was the grease blocking the firing pin. I'll leave it and see what happens when I take it out for our first date. .

March 7, 2012, 11:54 AM	#5
Hansam Senior Member Join Date: February 21, 2012 Location: Wisconsin Posts: 763	I grease the BCG but its only very lightly greased. Basically I apply the grease then wipe it down till I can barely feel the presence of the grease. Thousands of rounds through my AR rifles and no problems with it regardless of weather conditions.

March 7, 2012, 12:30 PM	#8
RT Senior Member Join Date: September 10, 2000 Location: San Antonio, TX Posts: 2,194	Bolt Carrier Group. Clean the grease off and drench it in CLP, or Slip 2000, or Mobil 1. Save the grease for a Garand

March 7, 2012, 12:39 PM	#9
btmj Senior Member Join Date: November 1, 2011 Location: Near St. Louis, Missouri Posts: 864	It seems there are a lot of different approaches and techniques for lubricating an AR-15..... And most seem to work. The common theme seems to be that the weapon will function as long as there is some lube, of some kind, on the BCG bearing (sliding) surfaces, the cam pin, the locking lugs, and the gas rings. A fair number of people do use grease. If grease did not work, people would not use it. However..... Crow Hunter's experience with cold weather is very informative. If I was going to use a grease, I would do what he did and verify my weapon's capability at low temperature..... which is why I use CLP. It may not be the best, but it has been battle tested for many years by hundreds of thousands of soldiers and marines.

March 7, 2012, 01:26 PM	#10
TacticalDefense1911 Senior Member Join Date: April 4, 2006 Location: Ohio Posts: 1,277	This should help. http://m4carbine.net/showthread.php?t=35490

March 7, 2012, 10:35 PM	#12
frigate88 Senior Member Join Date: June 30, 2011 Location: LOXAHATCHEE, FL Posts: 204	Oh silly mikey Tac-defence Thanks, that link was really informative for me.