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Posted: 9/13/2016 11:59:43 PM EDT
| Correct me if I am wrong but it is my understanding that the bolt is kept in the extended position during cycling in way of the cam pin nob kept in the 12 o clock position by the walls of the trough in the upper receiver for the charging handle. If so wouldn't the bolt stop force the bolt to compress on last round bolt hold open which in turn would cause the steel nob to dig into the left side of the aluminum trough? Is that something that would happen? Or is that not how it works at all? |
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Yes, you are correct. During counter recoil, the left side of the cam pin head rubs against the left side of the slot in the upper receiver, and the right side of the carrier key rubs against the right side of the slot in the upper receiver. The side loading pressure on these components increases with any resistance to forward movement applied to the bolt, such as feeding rounds from the magazine, and engagement of the bolt stop.
Luckily, it is not something to be overly worried about. Engineers sized bearing surfaces and limited the cam pin free travel to prevent the cam pin impacts causing any significant damage to the upper. Lubricate the appropriate surfaces, and the upper receiver will probably outlast the barrel and bolt a few times. |
| I wasn't worried about the cam pin head dragging on the side of the trough as much as it repeatedly impacting one spot alongside the trough on last round bolt hold open. Thus the smaller bearing surface on the roller bearing would actually have me worry more. Also I'm on DI so correct me if I'm wrong but if I were to use this wouldn't I have to remove the gas key every time I disassemble the BCG? |
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the cam head will ride the interior of the upper, just like the base of the gas key will
the wear is negligible, simply lubricate the weapon in wear locations Quoted:
Thanks. I guess sometimes I just think too much. i'm down with it, it means you're thinking about how the weapon functions |
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