AR15.Com Archives
 Normal Cam-pin drag?
12_gauge  [Member]
1/24/2012 6:25:49 PM EST
I know the "ramp" behind (toward the stock from) the relief is "normal", but does this look normal? @ 250 rounds fired so far.
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Semper_Firearms  [Member]
1/24/2012 6:43:57 PM EST
It looks a little excessive to me. But if it shoots fine then I wouldnt worry about it, unless it gets worse.
Girthrockwel  [Team Member]
1/25/2012 2:44:57 PM EST
I've got one that looks about like that. I think it happened when it was new and the bolt was tight in the carrier. I haven't noticed it get any worse so I didn't worry. Is your's a new rifle?


ETA: I didn't notice that you said 250 rounds. I wouldn't worry. Once everything loosens up it'll be fine.
SouthPawPiston  [Member]
1/26/2012 4:14:17 AM EST
i am having the same issue on my new Stag 8L. Is this normal for a new rifle? remember this is first from left side of rifle and dust cover opens upward. the width of the "wear" is the same width as cam pin. This happened after ~ 200 rounds. All of the lint is after I stopped cleaning and was in the middle of freaking out. (sorry for the huge size. I am terrible at image hosting)

12_gauge  [Member]
1/26/2012 5:06:17 AM EST
Originally Posted By SouthPawPiston:
i am having the same issue on my new Stag 8L. Is this normal for a new rifle? remember this is first from left side of rifle and dust cover opens upward. the width of the "wear" is the same width as cam pin. This happened after ~ 200 rounds. All of the lint is after I stopped cleaning and was in the middle of freaking out. (sorry for the huge size. I am terrible at image hosting)

http://i.imgur.com/QlgDa.jpg http://i.imgur.com/Bs1jN.jpg


Todd from Noveske has seen my rifle and said it is normal. Yours has nearly identical markings. Rest easy.
SouthPawPiston  [Member]
1/26/2012 5:39:40 AM EST
thanks for the reassurance. I guess as long as it goes boom each time and cycles well.
12_gauge  [Member]
1/26/2012 2:07:49 PM EST
Originally Posted By SouthPawPiston:
thanks for the reassurance. I guess as long as it goes boom each time and cycles well.


Your's only goes "boom", not "boomboomboom"?

Mine too
SouthPawPiston  [Member]
1/27/2012 4:19:54 AM EST
ya...and I only get 10 rounds max per magazine and have to use a special tool to remove the magazine because it's "fixed"

I did enjoy the 80 degree SoCal weather yesterday though. I wore flip flops! Trade offs, I guess.
WI57  [Team Member]
1/27/2012 6:16:03 PM EST
Thats not so bad...



Blankwaffe98  [Member]
1/27/2012 9:37:51 PM EST




You know,that rifle looks so dry it made me thirsty.

Blankwaffe98  [Member]
1/27/2012 9:54:42 PM EST
Originally Posted By 12_gauge:
I know the "ramp" behind (toward the stock from) the relief is "normal", but does this look normal? @ 250 rounds fired so far.
http://i43.tinypic.com/w7eb5x.jpg


Like I said on TOS,looks normal to me as well.Just keep it lubed properly.
Speaking of which,I see you broke down and rubbed the Frog around in there.

As a personal observation,Ive noticed that having heavy extractor tension(XP extractor spring and/or o-ring) will tend to cause the cam pin to bear more against the upper(just before the cam pin recess) on the in battery stroke as the bolt is forced back attempting to following the carriers cam pin journal(rotation) as it tries to overcome the extractor and ride over the cartridge rim.

12_gauge  [Member]
1/28/2012 1:57:50 PM EST
Originally Posted By Blankwaffe98:
Originally Posted By 12_gauge:
I know the "ramp" behind (toward the stock from) the relief is "normal", but does this look normal? @ 250 rounds fired so far.
http://i43.tinypic.com/w7eb5x.jpg


Like I said on TOS,looks normal to me as well.Just keep it lubed properly.
Speaking of which,I see you broke down and rubbed the Frog around in there.

As a personal observation,Ive noticed that having heavy extractor tension(XP extractor spring and/or o-ring) will tend to cause the cam pin to bear more against the upper(just before the cam pin recess) on the in battery stroke as the bolt is forced back attempting to following the carriers cam pin journal(rotation) as it tries to overcome the extractor and ride over the cartridge rim.



Vicious lies!
Blankwaffe98  [Member]
1/28/2012 7:05:09 PM EST
Originally Posted By 12_gauge:
Originally Posted By Blankwaffe98:
Originally Posted By 12_gauge:
I know the "ramp" behind (toward the stock from) the relief is "normal", but does this look normal? @ 250 rounds fired so far.
http://i43.tinypic.com/w7eb5x.jpg


Like I said on TOS,looks normal to me as well.Just keep it lubed properly.
Speaking of which,I see you broke down and rubbed the Frog around in there.

As a personal observation,Ive noticed that having heavy extractor tension(XP extractor spring and/or o-ring) will tend to cause the cam pin to bear more against the upper(just before the cam pin recess) on the in battery stroke as the bolt is forced back attempting to following the carriers cam pin journal(rotation) as it tries to overcome the extractor and ride over the cartridge rim.



Vicious lies!


Can't lie...I see the wad of Frog poop left behind..
altopwescap  [Member]
1/28/2012 11:27:38 PM EST
M-16 uppers have similar bang marks
12_gauge  [Member]
1/29/2012 1:23:43 AM EST
Originally Posted By Blankwaffe98:
Originally Posted By 12_gauge:
Originally Posted By Blankwaffe98:
Originally Posted By 12_gauge:
I know the "ramp" behind (toward the stock from) the relief is "normal", but does this look normal? @ 250 rounds fired so far.
http://i43.tinypic.com/w7eb5x.jpg


Like I said on TOS,looks normal to me as well.Just keep it lubed properly.
Speaking of which,I see you broke down and rubbed the Frog around in there.

As a personal observation,Ive noticed that having heavy extractor tension(XP extractor spring and/or o-ring) will tend to cause the cam pin to bear more against the upper(just before the cam pin recess) on the in battery stroke as the bolt is forced back attempting to following the carriers cam pin journal(rotation) as it tries to overcome the extractor and ride over the cartridge rim.



Vicious lies!


Can't lie...I see the wad of Frog poop left behind..

It could be other things.

ranger396  [Member]
1/29/2012 9:44:05 AM EST
Same wear on my DPMS upper assembly after 200 rounds. I will still try and call them this week to make sure it is ok.
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