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post #1 of 9 (permalink) Old 02-03-2014, 10:47 PM Thread Starter
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AR builds

I am a newbie to building ARs. Are there any advantages or disadvantages to using a semi auto or a full auto bolt carrier group? Also, I have not found anything to suggest a full auto BCG is illegal in PA so let me know if I am wrong on that! Thanks.
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post #2 of 9 (permalink) Old 02-03-2014, 11:44 PM
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Re: AR builds

the full auto BCG is legal.
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post #3 of 9 (permalink) Old 02-04-2014, 01:04 AM
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Re: AR builds

Does it come under NFA or BATF at that point?

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post #4 of 9 (permalink) Old 02-04-2014, 08:27 AM
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Re: AR builds

No, the full auto bcg is just a part, and on its own, can do nothing to affect the gun's ability to fire in semi auto vs full auto. It is necessary for a true full auto AR/m4/m16, but really it's just the same as any other random part, such as a gas tube, forearm, etc, and in a non full auto weapon, functions the same as it's non-full auto counterpart.
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post #5 of 9 (permalink) Old 02-05-2014, 12:01 PM
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Re: AR builds

Can you build a full auto if you have the federal stamp?

I always thought the gun had to of been manufactured before 1986 to be legal.

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post #6 of 9 (permalink) Old 02-05-2014, 03:16 PM
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Re: AR builds

Quote:
Originally Posted by HighCountry66
Can you build a full auto if you have the federal stamp?

I always thought the gun had to of been manufactured before 1986 to be legal.
Yes, you can. You need the ATF tax stamp, and the serialized, nfa registered pre-86 manufactured part..

Whether you are building a gun on a registered receiver, an rdias, or a registered ll, the only thing that matters is that the serialized part is NFA registered(and consequently would have been manufactured prior to 1986 in order to be).

There are still some virgin stripped registered receivers out there that pop up from time to time. Pick one of those up and you can build it into whatever you want.
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post #7 of 9 (permalink) Old 02-06-2014, 12:06 AM
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Re: AR builds

Quote:
Originally Posted by mike76er
I am a newbie to building ARs. Are there any advantages or disadvantages to using a semi auto or a full auto bolt carrier group? Also, I have not found anything to suggest a full auto BCG is illegal in PA so let me know if I am wrong on that! Thanks.
Advantage seems to be that there is more mass and more metal in the full auto carrier - seems most people building prefer to use them for these reasons, not that they want to go full auto. It takes a few more parts to go full auto beyond the bcg, including sear and fa lower. And the tax stamp to be legal. Seems most pro builders are using them too - I would follow their lead.

Read this - http://www.ar15.com/archive/topic.ht...f=118&t=354252
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post #8 of 9 (permalink) Old 02-06-2014, 09:58 PM Thread Starter
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Re: AR builds

Thanks! I am not interested in going full auto...I just got a good deal on one on gunbroker.
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post #9 of 9 (permalink) Old 02-06-2014, 10:20 PM
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Re: AR builds

One reason some builders use them is because for one reason or another they want to "slow the gun down". The extra weight helps with that. I would imagine most of us would probably never notice the difference though.

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