malfunctioning BCH

GunNut365 · September 14, 2018, 03:39 PM

I recently finished building a 300 blackout and after cycling 3-4 rounds it wants to jam to the point I have to force the bolt back. First I thought it may be bad head spacing but swapped out another BCH and it functioned fine, I know BCH aren't very expensive but I was curios if there was something to look at with the one I have to figure were it may be causing my issue before I do purchase another.

**44 AMP** · September 14, 2018, 05:22 PM

What is a BCH??

KEYBEAR · September 14, 2018, 06:21 PM

BCH I am guessing but I think it is some kind of Chinese lunch . But that could be wrong ?

Dufus · September 14, 2018, 06:57 PM

BCH = Big Cross Hair

tango1niner · September 14, 2018, 07:04 PM

Let the games begin...

T. O'Heir · September 15, 2018, 12:43 PM

"...swapped out another BCH..." Another BCH what?(whatever a 'BCH' is.) If you just changed the bolt you may, and probably have, created bad headspace. Bolts are not interchangeable.
"...have to force the bolt back..." A failure to extract is an indicator of bad headspace, but that's not the only cause of extraction issues. You assemble the barrel and receiver using proper headspace gauges or just screw the barrel in and hope?

Mobuck · September 16, 2018, 09:19 PM

My opinion is your cam pin is galled and binding in it's track due to lack of lubrication.

"If you just changed the bolt you may, and probably have, created bad headspace. Bolts are not interchangeable."
Referring to an AR 15: Headspace of a low round count bolt and barrel extension most likely will not be adversely affected by exchange of another low round count bolt. I know this is counter to all the stuff we've heard BUT it's common practice for military units to dunk a handful of bolts/carriers in a tub of solvent or diesel before cleaning. After cleaning, the bolts/carriers go back in whichever rifle is being re-assembled next.
I don't do it that way but apparently it's not such a big deal.

arquebus357 · September 16, 2018, 10:22 PM

How provincial. OP thinks everyone knows the acronyms he and his friends use when texting. hahahahaha.

An example of "provincialism" .... A guy from Spirit Lake, Iowa walks into a Brooklyn, NY Italian deli and orders a "vinny's big dago sub".

DnPRK · September 16, 2018, 11:37 PM

Take the bolt carrier group out and grease (not oil) the cam pin and the backs of the 7 bolt lugs. Shoot 5 rounds and grease the backs of the bolt lugs again. Shoot 10 rounds and oil the bolt so it is sloppy wet. An AR-15 bolt carrier group may need to run wet with oil until it breaks in. Once broken in, you can back off on the amount of oil.

Mobuck · September 17, 2018, 06:55 AM

"Take the bolt carrier group out and grease (not oil) the cam pin and the backs of the 7 bolt lugs. Shoot 5 rounds and grease the backs of the bolt lugs again. Shoot 10 rounds and oil the bolt so it is sloppy wet. An AR-15 bolt carrier group may need to run wet with oil until it breaks in. Once broken in, you can back off on the amount of oil."

Yupper. Oil oozing out of every hole and smoking like it's on fire for the first 10-20 shots. That's the way I do it. No joking, it works.

gwpercle · September 17, 2018, 03:14 PM

BCH .... Bitcoin Cash

tango1niner · September 17, 2018, 03:54 PM

Maybe he meant to type "BCG" = bolt carrier group...

The "g" and "h" are right next to each other on the keyboard...

September 14, 2018, 03:39 PM	#1
GunNut365 Junior Member Join Date: October 28, 2013 Posts: 1	malfunctioning BCH I recently finished building a 300 blackout and after cycling 3-4 rounds it wants to jam to the point I have to force the bolt back. First I thought it may be bad head spacing but swapped out another BCH and it functioned fine, I know BCH aren't very expensive but I was curios if there was something to look at with the one I have to figure were it may be causing my issue before I do purchase another.

September 14, 2018, 05:22 PM	#2
44 AMP Staff Join Date: March 11, 2006 Location: Upper US Posts: 28,791	What is a BCH?? __________________ All else being equal (and it almost never is) bigger bullets tend to work better.

September 15, 2018, 12:43 PM	#6
T. O'Heir Senior Member Join Date: February 13, 2002 Location: Canada Posts: 12,453	"...swapped out another BCH..." Another BCH what?(whatever a 'BCH' is.) If you just changed the bolt you may, and probably have, created bad headspace. Bolts are not interchangeable. "...have to force the bolt back..." A failure to extract is an indicator of bad headspace, but that's not the only cause of extraction issues. You assemble the barrel and receiver using proper headspace gauges or just screw the barrel in and hope? __________________ Spelling and grammar count!

September 17, 2018, 03:54 PM	#12
tango1niner Senior Member Join Date: March 5, 2009 Location: NY Posts: 317	Maybe he meant to type "BCG" = bolt carrier group... The "g" and "h" are right next to each other on the keyboard... Last edited by tango1niner; September 17, 2018 at 04:22 PM.

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September 14, 2018, 06:21 PM	#3
KEYBEAR Senior Member Join Date: January 11, 2012 Location: Indiana Posts: 1,059	BCH I am guessing but I think it is some kind of Chinese lunch . But that could be wrong ?

September 14, 2018, 06:57 PM	#4
Dufus Senior Member Join Date: December 10, 2014 Posts: 1,965	BCH = Big Cross Hair

September 14, 2018, 07:04 PM	#5
tango1niner Senior Member Join Date: March 5, 2009 Location: NY Posts: 317	Let the games begin...

September 16, 2018, 09:19 PM	#7
Mobuck Junior member Join Date: February 2, 2010 Posts: 6,846	My opinion is your cam pin is galled and binding in it's track due to lack of lubrication. "If you just changed the bolt you may, and probably have, created bad headspace. Bolts are not interchangeable." Referring to an AR 15: Headspace of a low round count bolt and barrel extension most likely will not be adversely affected by exchange of another low round count bolt. I know this is counter to all the stuff we've heard BUT it's common practice for military units to dunk a handful of bolts/carriers in a tub of solvent or diesel before cleaning. After cleaning, the bolts/carriers go back in whichever rifle is being re-assembled next. I don't do it that way but apparently it's not such a big deal.

September 16, 2018, 10:22 PM	#8
arquebus357 Senior Member Join Date: December 19, 2016 Location: Atlanta, Georgia area Posts: 455	How provincial. OP thinks everyone knows the acronyms he and his friends use when texting. hahahahaha. An example of "provincialism" .... A guy from Spirit Lake, Iowa walks into a Brooklyn, NY Italian deli and orders a "vinny's big dago sub".

September 16, 2018, 11:37 PM	#9
DnPRK Senior Member Join Date: August 24, 2001 Location: LC, Ca Posts: 1,917	Take the bolt carrier group out and grease (not oil) the cam pin and the backs of the 7 bolt lugs. Shoot 5 rounds and grease the backs of the bolt lugs again. Shoot 10 rounds and oil the bolt so it is sloppy wet. An AR-15 bolt carrier group may need to run wet with oil until it breaks in. Once broken in, you can back off on the amount of oil.

September 17, 2018, 06:55 AM	#10
Mobuck Junior member Join Date: February 2, 2010 Posts: 6,846	"Take the bolt carrier group out and grease (not oil) the cam pin and the backs of the 7 bolt lugs. Shoot 5 rounds and grease the backs of the bolt lugs again. Shoot 10 rounds and oil the bolt so it is sloppy wet. An AR-15 bolt carrier group may need to run wet with oil until it breaks in. Once broken in, you can back off on the amount of oil." Yupper. Oil oozing out of every hole and smoking like it's on fire for the first 10-20 shots. That's the way I do it. No joking, it works.

September 17, 2018, 03:14 PM	#11
gwpercle Senior Member Join Date: November 30, 2012 Location: Baton Rouge, Louisiana Posts: 1,748	BCH .... Bitcoin Cash