POF Roller cam pin

scottmilk9

scottmilk9

New member
Here are pictures of POF's roller cam pin and roller cam upgrade kit.

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223/556 Roller Cam Pin Upgrade Kit
• Roller Cam Pin with hard chromed pin body and NP3 coated roller
• Hard chrome replacement gas key with relief cut for roller
• Hardened replacement gas key bolts
Installation of the Roller Cam Pin Upgrade kit replaces the standard cam pin’s engagement surface with a NP3 coated roller, reducing the friction and drag and increasing the smoothness of the operation of the bolt and carrier. The hard chrome and NP3 coating of these parts reduces the need for lubrication on these parts.
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Scott, can you talk a bit about what kind of performance differences we could expect by installing this kit and the price?

Thanks.
 
We've noticed that on a lot of the upper receivers the regular cam pin tends to gouge the inside of the receiver.
It also increases the smoothness of operation in the bolt carrier and reduces the drag from the normal cam pin. which is rectagle.

Think about how it unlocks and a straight surface has to turn 90 degrees, it has to cause drag inside the receiver with the bolt carrier, the cam pin is a roller which moves along the groove in the upper receiver causing less drag.

It enhances reliability especially when the gun is dirty or shooting supressed.



 
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Quote: It enhances reliability especially when the gun is dirty or shooting supressed.

Yep, in those conditions I can see where it could give you some reliablilty gains.

I was pretty much just joking around with my comment, from a predator hunter point of view.
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It is a cool design.
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The cam pins do wear which can be minimized by lubing them with grease. Replace when there is visible wear (couple thousand rounds). They are cheap.

Jack
 
Originally Posted By: scottmilk9We've noticed that on a lot of the upper receivers the regular cam pin tends to gouge the inside of the receiver.
It also increases the smoothness of operation in the bolt carrier and reduces the drag from the normal cam pin. which is rectagle.

Think about how it unlocks and a straight surface has to turn 90 degrees, it has to cause drag inside the receiver with the bolt carrier, the cam pin is a roller which moves along the groove in the upper receiver causing less drag.

It enhances reliability especially when the gun is dirty or shooting supressed.





Scott, I rarely to never deal with AR's that have ever been used in combat situations, but I've never seen damage to the inside of an upper receiver from the cam-pin. The cam-pin is actuated by the curved slot in the carrier, not by the rectangular head of the pin running in the upper receiver. I have an upper that is on it's third barrel, and the bolt in it is on it's third set of gas-rings. The receiver is still pristine, but the cam-pin shows plenty of wear where it is operated by the slot in the carrier.

The bolt will cam open and closed without running in the receiver, so I'm just trying to wrap my head around the roller VS. the regular cam-pin.
 
Mike,

It might be more prevalent in gas piston guns, but i see it quite often where the upper receiver is gouged on the inside. It might also because we do deal with a lot of military/law enforcement guns instead of hunters.

The roller will definitely reduce drag of the bolt carrier on the inside of the upper.

I had a brain cramp and said the cam pin rotates 90 degrees, which during operation is incorrect. I was thinking about when installing it I guess.
 
When i come back from vacation on tuesday, I'll take photos or a small video of our cutout upper and show how the roller works.

The cost of the cam pin is $20 and the upgrade kit which comes with a new chromed carrier key is $45.

For the .223 you'll have to notch your gas key or buy the upgrade kit, but for .308's they'll drop right into any of the existing systems.
 
I'm always the skeptic on "New and Improved". Being a hunter/paper puncher, what will I benefit from this POF roller cam pin system other than being able to say "Hey, I got a new POF roller cam pin system in my rifle". People will want to know. Sorry to sound hateful, $65 bucks is $65 bucks.
 
Originally Posted By: doggin coyotesWhat happened to the small video of the cutout upper showing how this thing works?

My I-phone is an older one without a video camera, I'm looking into borrowing one, i got the cut out and very clear how it works and rolls inside the upper. Stay tuned.........
 
Those are nice looking and nicely finished parts. I guess I don't understand why the cam pin needs a head at all either square or round. It seems to me that when the carrier starts rearward from gas pressure the cam track in the carrier causes the pin to rotate and unlock the bolt lugs from their seats in the barrel extention. Seems to me the only purpose of the head is to have a handle to get hold of when disassembling the bolt. After all the firing pin going through the cam pin secures it. Someone explain it to me. TnTnTn
 
Originally Posted By: TnTnTn ....Seems to me the only purpose of the head is to have a handle to get hold of when disassembling the bolt. After all the firing pin going through the cam pin secures it. Someone explain it to me. TnTnTn

It has nothing to do with securing the cam pin. It has a roller head which rides on the inside of the upper receiver, the flat, rectangle shaped cam pin slides inside of it, this with a roller helps it along, therefore creating less drag.

I do have to admit, its probably not for the hunting crowd, its more geared towards the tactical crowd where thousands of rounds are fired through the guns.

I'm still working on getting a video of it.
 
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Thanks for the reply scottmilk. Thinking more about it, I figure the reason for the square or round head on the cam pin that rides in a groove in top of the receiver as the bolt opens and closes is to more precisely align the locking lugs as they pass through the cuts in the barrel extension. The width of the cam slot in the bolt carrier has some relief/clearance that may not allow as precise an alignment as the headed pin would. A headless cam pin would probably work but I imagine tolerances would have to be very precise to avoid broken bolt lugs or extension seats. I am beginning to see the light-I think. LOL TnTnTn
 
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