Lantac milspec AR BCG

zoo · September 27, 2020, 03:59 PM

Seeing how I’m frequently talking about how great Legend 350 AR uppers are, l thought I should report this issue.

After around 300 rounds of various kinds of factory Winchester and Hornady 350 ammunition through a particular 350 upper, I ran into a problem.

While cleaning the three month old Lantac bcg, I found what appears to be a hairline crack around about a third of the cam pin. One of their gold colored ones with the round heads. I guess bad parts can slip by on any company.

I sincerely doubt the pressures were anything out of the norm.

bfoosh006 · September 27, 2020, 09:14 PM

Do you happen to have any pictures ?

Sweet Shooter · October 12, 2020, 03:02 PM

Are you sure it's a crack. It's not unusual to have cam pins get all sorts of beat up, even the fancy ones.

zoo · October 19, 2020, 02:45 AM

Wasn’t a crack best I can tell. More like a scratch or wear. Turns out it is apparently not that unusual. Funny I’ve not noticed that on AR cam pins before though.

stagpanther · October 19, 2020, 05:06 AM

That's just your BCG trying to tell you "please don't make us cycle this dog of a cartridge in a gas gun system it doesn't work well in."

Seriously--I've seen this in BCGs before, what I think is going on is that the cam pin body is being scored as the bolt locks/unlocks by the slot where the pin goes through the carrier body. What I think is the cause is that the slot in some carriers' bodies often have what looks like a straight slot cut into it--and then a hole drilled into it offset to effect the bolt locking/unlocking. Sometimes that hole has a sharp edge or burr where it merges into the straight slot and that often corresponds to the scoring in the cam pin.

zoo · October 21, 2020, 08:26 PM

SP, frankly the 350L works quite well out of an AR platform but please don’t tell Walmart!

September 27, 2020, 03:59 PM	#1
zoo member Join Date: October 2, 2019 Posts: 414	Lantac milspec AR BCG Seeing how I’m frequently talking about how great Legend 350 AR uppers are, l thought I should report this issue. After around 300 rounds of various kinds of factory Winchester and Hornady 350 ammunition through a particular 350 upper, I ran into a problem. While cleaning the three month old Lantac bcg, I found what appears to be a hairline crack around about a third of the cam pin. One of their gold colored ones with the round heads. I guess bad parts can slip by on any company. I sincerely doubt the pressures were anything out of the norm.

October 19, 2020, 05:06 AM	#5
stagpanther Senior Member Join Date: March 2, 2014 Posts: 11,773	That's just your BCG trying to tell you "please don't make us cycle this dog of a cartridge in a gas gun system it doesn't work well in." Seriously--I've seen this in BCGs before, what I think is going on is that the cam pin body is being scored as the bolt locks/unlocks by the slot where the pin goes through the carrier body. What I think is the cause is that the slot in some carriers' bodies often have what looks like a straight slot cut into it--and then a hole drilled into it offset to effect the bolt locking/unlocking. Sometimes that hole has a sharp edge or burr where it merges into the straight slot and that often corresponds to the scoring in the cam pin. __________________ "Everyone speaks gun."--Robert O'Neill *I am NOT an expert--I do not have any formal experience or certification in firearms use or testing; use any information I post at your own risk!*

September 27, 2020, 09:14 PM	#2
bfoosh006 Senior Member Join Date: February 17, 2009 Posts: 1,089	Do you happen to have any pictures ?

October 12, 2020, 03:02 PM	#3
Sweet Shooter Senior Member Join Date: June 17, 2011 Posts: 672	Are you sure it's a crack. It's not unusual to have cam pins get all sorts of beat up, even the fancy ones.

October 19, 2020, 02:45 AM	#4
zoo member Join Date: October 2, 2019 Posts: 414	Wasn’t a crack best I can tell. More like a scratch or wear. Turns out it is apparently not that unusual. Funny I’ve not noticed that on AR cam pins before though.

October 21, 2020, 08:26 PM	#6
zoo member Join Date: October 2, 2019 Posts: 414	SP, frankly the 350L works quite well out of an AR platform but please don’t tell Walmart!