JB Compound

cw308 · June 27, 2020, 10:55 AM

Sorry for bringing this up again , I do use it on my barrels and never had problems , JB and washed out with kroil . I'm asking now only because my AR has a chrome lined barrel and chambered in 5.56 . Is chrome harder or softer then bare metal , can the CL wear faster then metal . It is a mil spec and when looking down the Darrel through a bore scope it looked rougher then my match and even my CZ452 stock Varmint barrel. Saw some gouges and pitting , may be normal I'm not sure . Only looked down the bores of fired rifles never brand new , ordered the scope after reading and shooting for many years. Things I'm sure look worse when highly magnified. . that's why I was thinking of using JB & Kroil treatment , wanted to hear the forums opinions .
PS : Again , I have used it in the past correctly and haven't scrubed the hell out of it , my give me a better look at the barrel condition ( it does shoot good for a AR)

Chris

Dfariswheel · June 27, 2020, 06:25 PM

Hard chrome is much harder then barrel steel.

In a chrome lined barrel you really shouldn't need to use JB since fouling won't adhere to the "slick" chrome nearly as bad as a bare steel barrel.
This is a major reason the military use chrome lined barrels.

In most cases you can clean a chrome lined barrel by just allowing the bore solvent some soak time.
READ THE SOLVENT LABEL. Some bore solvents can damage a bore if left in too long.
If you use ordinary Hoppe's #9 you can leave it in forever with no harm.

To clean my chrome bores I use whatever bore solvent I have to run a couple of wet patches through, give it 20 to 30 minutes to soak then run another wet patch through to check for copper fouling.
Usually by the time the third patch goes through the bore is clean unless it's really fouled.
In that case just keep waiting 20 minutes and running a wet patch through until one comes out clean. Then dry and oil the bore.

cw308 · June 27, 2020, 07:19 PM

Dfaris
Thank you for answering my post , the rifle does clean up pretty fast , I bought the rifle in the late 80's and I feel maybe 500 if that has be fired through the barrel , doesn't have a scratch n it . I now will be shooting it more for sure . I used KG-1 for carbon and KG-12 for copper then a few passes of old reliable #9 and last a patch with some Ballistol . After I see how fouled the barrel gets I may just use #9 and Ballistol .Thanks again for the helpful advice. Hope All is Well.

Chris

Shadow9mm · June 27, 2020, 09:30 PM

As stated above chrome it much harder and slicker than barrel steel. JB makes be nervous. I am actually waiting on a bore scope as i think i may have scratched a barrel during my last use, never had an issue before. Personally I would clean it real good at least twice and see how it looks. I just switched to Bore Tech Eliminator, a general purpose bore cleaner that is also supposed to remove copper. I took a gun that i though was clean except copper and got a lot of crud out I didn't even know was there in addition to the copper, barrel looked like new.

cw308 · June 27, 2020, 10:27 PM

Shadow
Don't get nervous looking down the bore when you get the bore scope .Looking down the bore the rifling looks sharp the barrel looks like a mirror . A bore scope you see every nook and cranny , if not a match grade lapped barrel through the scope they look not as pretty . How did you think you scratched the bore? Thanks for answering my post.

Chris

June 27, 2020, 10:55 AM	#1
cw308 Senior Member Join Date: September 2, 2010 Location: Plainview , Long Island NY Posts: 3,863	JB Compound Sorry for bringing this up again , I do use it on my barrels and never had problems , JB and washed out with kroil . I'm asking now only because my AR has a chrome lined barrel and chambered in 5.56 . Is chrome harder or softer then bare metal , can the CL wear faster then metal . It is a mil spec and when looking down the Darrel through a bore scope it looked rougher then my match and even my CZ452 stock Varmint barrel. Saw some gouges and pitting , may be normal I'm not sure . Only looked down the bores of fired rifles never brand new , ordered the scope after reading and shooting for many years. Things I'm sure look worse when highly magnified. . that's why I was thinking of using JB & Kroil treatment , wanted to hear the forums opinions . PS : Again , I have used it in the past correctly and haven't scrubed the hell out of it , my give me a better look at the barrel condition ( it does shoot good for a AR) Chris

June 27, 2020, 09:30 PM	#4
Shadow9mm Senior Member Join Date: March 21, 2012 Location: Indianapolis, IN Posts: 3,969	As stated above chrome it much harder and slicker than barrel steel. JB makes be nervous. I am actually waiting on a bore scope as i think i may have scratched a barrel during my last use, never had an issue before. Personally I would clean it real good at least twice and see how it looks. I just switched to Bore Tech Eliminator, a general purpose bore cleaner that is also supposed to remove copper. I took a gun that i though was clean except copper and got a lot of crud out I didn't even know was there in addition to the copper, barrel looked like new. __________________ I don't believe in "range fodder" that is why I reload.

June 27, 2020, 06:25 PM	#2
Dfariswheel Senior Member Join Date: May 4, 2001 Posts: 7,478	Hard chrome is much harder then barrel steel. In a chrome lined barrel you really shouldn't need to use JB since fouling won't adhere to the "slick" chrome nearly as bad as a bare steel barrel. This is a major reason the military use chrome lined barrels. In most cases you can clean a chrome lined barrel by just allowing the bore solvent some soak time. READ THE SOLVENT LABEL. Some bore solvents can damage a bore if left in too long. If you use ordinary Hoppe's #9 you can leave it in forever with no harm. To clean my chrome bores I use whatever bore solvent I have to run a couple of wet patches through, give it 20 to 30 minutes to soak then run another wet patch through to check for copper fouling. Usually by the time the third patch goes through the bore is clean unless it's really fouled. In that case just keep waiting 20 minutes and running a wet patch through until one comes out clean. Then dry and oil the bore.

June 27, 2020, 07:19 PM	#3
cw308 Senior Member Join Date: September 2, 2010 Location: Plainview , Long Island NY Posts: 3,863	Dfaris Thank you for answering my post , the rifle does clean up pretty fast , I bought the rifle in the late 80's and I feel maybe 500 if that has be fired through the barrel , doesn't have a scratch n it . I now will be shooting it more for sure . I used KG-1 for carbon and KG-12 for copper then a few passes of old reliable #9 and last a patch with some Ballistol . After I see how fouled the barrel gets I may just use #9 and Ballistol .Thanks again for the helpful advice. Hope All is Well. Chris

June 27, 2020, 10:27 PM	#5
cw308 Senior Member Join Date: September 2, 2010 Location: Plainview , Long Island NY Posts: 3,863	Shadow Don't get nervous looking down the bore when you get the bore scope .Looking down the bore the rifling looks sharp the barrel looks like a mirror . A bore scope you see every nook and cranny , if not a match grade lapped barrel through the scope they look not as pretty . How did you think you scratched the bore? Thanks for answering my post. Chris