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 Is it normal for the cam pin to be drilled opposite how a AR15 cam pin is?
TheTracker  [Team Member]
10/20/2011 10:30:22 AM
I noticed on my Armalite that the cam pin on the bolt carrier group has it's firing pin hole opposite sides.

When I disassemble a AR15 I turn the cam pin to take it out .
On my AR10 I don't have to. there is no rotating of the pin.


Normal or did I get a cam pin drilled wrong?

thanks

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DavidGCalderone  [Member]
10/20/2011 11:42:40 AM
All I can tell you is my two Ar-10'S are the same as yours.
Southrnshooter  [Member]
10/20/2011 2:35:48 PM
Goes to the safe to look at mine.
DaveS  [Team Member]
10/20/2011 3:40:42 PM


Your's is the same as everyone else's.

ArmaLite  [Site Sponsor]
10/20/2011 3:45:59 PM
Originally Posted By TheTracker:
I noticed on my Armalite that the cam pin on the bolt carrier group has it's firing pin hole opposite sides.

When I disassemble a AR15 I turn the cam pin to take it out .
On my AR10 I don't have to. there is no rotating of the pin.


Normal or did I get a cam pin drilled wrong?

thanks



It's normal. The AR-10 has a larger cam pin (.375 dia - .400 X .500 head) as opposed to the M-15/AR-15 (.310 dia - .317 X .400). The cam pin in the AR-10 is beefier because there's much more thrust with the AR-10 than the M-15/AR-15. The M-15/AR-15 cam pin in an AR-10 would break under the hard recoil.

That being said, the AR-10 cam pin cannot rotate within the upper receiver under the picatinny rail (same size as the M-15/AR-15)because of it's head size whereas the M-15/AR15 can and was designed to do so. Why I don't know. The AR-10 was designed first and the cam pin was never designed to rotate.

TR
Southrnshooter  [Member]
10/20/2011 5:09:08 PM
Originally Posted By DaveS:


Your's is the same as everyone else's.



Sorry, wife made brownies and I got lost going to the safe.
TheTracker  [Team Member]
10/20/2011 9:02:25 PM
thanks guys

Southrnshooter  [Member]
10/20/2011 11:31:15 PM
Originally Posted By ArmaLite:
Originally Posted By TheTracker:
I noticed on my Armalite that the cam pin on the bolt carrier group has it's firing pin hole opposite sides.

When I disassemble a AR15 I turn the cam pin to take it out .
On my AR10 I don't have to. there is no rotating of the pin.


Normal or did I get a cam pin drilled wrong?

thanks



It's normal. The AR-10 has a larger cam pin (.375 dia - .400 X .500 head) as opposed to the M-15/AR-15 (.310 dia - .317 X .400). The cam pin in the AR-10 is beefier because there's much more thrust with the AR-10 than the M-15/AR-15. The M-15/AR-15 cam pin in an AR-10 would break under the hard recoil.

That being said, the AR-10 cam pin cannot rotate within the upper receiver under the picatinny rail (same size as the M-15/AR-15)because of it's head size whereas the M-15/AR15 can and was designed to do so. Why I don't know. The AR-10 was designed first and the cam pin was never designed to rotate.
TR


I love to learn stuff like this. I knew the AR-10 was first, but not that a change like that was made to the AR-15.
geskorup  [Member]
10/21/2011 1:35:54 AM
Originally Posted By ArmaLite:
Originally Posted By TheTracker:
I noticed on my Armalite that the cam pin on the bolt carrier group has it's firing pin hole opposite sides.

When I disassemble a AR15 I turn the cam pin to take it out .
On my AR10 I don't have to. there is no rotating of the pin.


Normal or did I get a cam pin drilled wrong?

thanks



It's normal. The AR-10 has a larger cam pin (.375 dia - .400 X .500 head) as opposed to the M-15/AR-15 (.310 dia - .317 X .400). The cam pin in the AR-10 is beefier because there's much more thrust with the AR-10 than the M-15/AR-15. The M-15/AR-15 cam pin in an AR-10 would break under the hard recoil.

That being said, the AR-10 cam pin cannot rotate within the upper receiver under the picatinny rail (same size as the M-15/AR-15)because of it's head size whereas the M-15/AR15 can and was designed to do so. Why I don't know. The AR-10 was designed first and the cam pin was never designed to rotate.

TR


How would the AR-15 cam pin rotate inside the upper if the firing pin goes straight through it?
Southrnshooter  [Member]
10/21/2011 11:14:42 AM
Originally Posted By geskorup:
Originally Posted By ArmaLite:
Originally Posted By TheTracker:
I noticed on my Armalite that the cam pin on the bolt carrier group has it's firing pin hole opposite sides.

When I disassemble a AR15 I turn the cam pin to take it out .
On my AR10 I don't have to. there is no rotating of the pin.


Normal or did I get a cam pin drilled wrong?

thanks



It's normal. The AR-10 has a larger cam pin (.375 dia - .400 X .500 head) as opposed to the M-15/AR-15 (.310 dia - .317 X .400). The cam pin in the AR-10 is beefier because there's much more thrust with the AR-10 than the M-15/AR-15. The M-15/AR-15 cam pin in an AR-10 would break under the hard recoil.

That being said, the AR-10 cam pin cannot rotate within the upper receiver under the picatinny rail (same size as the M-15/AR-15)because of it's head size whereas the M-15/AR15 can and was designed to do so. Why I don't know. The AR-10 was designed first and the cam pin was never designed to rotate.

TR


How would the AR-15 cam pin rotate inside the upper if the firing pin goes straight through it?


He is talking about it rotating when you install it. When you drop the AR-10 cam pin in, the firing pin hole is already lined up. When you drop in the AR-15 cam pin in, you rotate it to line the hole up and then insert the firing pin.
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