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BCM Bolt Carrier Group (MPI) - Auto

This is a discussion on BCM Bolt Carrier Group (MPI) - Auto within the AR Talk forums, part of the Long Gun Talk category; In stock. BCM Bolt Carrier Group MPI Auto M16...

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Old 06-03-2009, 07:05 PM   #1
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BCM Bolt Carrier Group (MPI) - Auto

In stock.

BCM Bolt Carrier Group MPI Auto M16
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Old 06-03-2009, 08:31 PM   #2
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And they are still there... Nice to see things are calming down a bit
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Old 06-03-2009, 08:40 PM   #3
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just bought one.
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Old 06-03-2009, 09:01 PM   #4
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Good to see, I missed out on the last batch.
Just got a LMT BCG on a notice from Ranier, so all is good.
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Old 06-04-2009, 07:21 AM   #5
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out of stock
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Old 06-23-2009, 03:25 PM   #6
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Back in stock...
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Old 06-23-2009, 04:46 PM   #7
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man!! i've missed that three times! even with the email notification.
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Old 06-23-2009, 05:05 PM   #8
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Newbie questions.

Why does it say (auto) I noticed they have a (semi) on their website.

Does it have all components in it or do I still need to buy firing pin extracted etc?

Thanks
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Old 06-23-2009, 05:29 PM   #9
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auto BCG are supposed to be more reliable than semi BCGs, bolt alone doesnt make it automatic
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Old 06-23-2009, 05:33 PM   #10
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Quote:
Originally Posted by BoltsFan View Post
Newbie questions.

Why does it say (auto) I noticed they have a (semi) on their website.

Does it have all components in it or do I still need to buy firing pin extracted etc?

Thanks
The auto is an M-16 bolt carrier while the semi is the AR-15. The auto is preferred in the carbine variants do to the faster cyclic rate of the carbine gas system (the auto carrier is heavier). The higher pressure= faster cyclic which is harder on the bolt and may reduce reliability. The faster unlock time in the bolt causes increased centrifugal force on the extractor which could cause the extractor to slip off the case rim.

Several things can be done to avoid this. A stronger extractor spring, auto carrier to increase the mass that is moved which will slow down the cyclic speed and heavier buffers.

No (before you ask) it is not illegal to install an auto carrier in a semi auto rifle.

BTW: the bolt is exactly the same, the carrier is different.

Hope this helps!
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