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Posted: 10/25/2013 4:19:12 AM EDT
| I have been learning more and more about these guns. Have a dumb question. I keep seeing where you can buy a full auto bolt carrier group. I'm not trying or wanting to make my gun automatic. Just curious as what these are for. There is obviously something else that needs done to make it automatic. |
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A full auto bolt carrier group just describes the profile of the carrier. It has a lug on the bottom that will trip the auto sear of a fully automatic rifle. The "semi auto" carrier groups do not have this lug. Both are fully legal to own and run in your ar. Most guys love the full auto carrier for a couple of reasons:
1.) They are typically heavier so most people like to run them to help keep the gun cycling smooth when it is over gassed. 2.) It is milspec and everything milspec is supposedly better 
Either will run fine in your gun 
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| ... the advantage of using a M16 carrier for me, was that you get a shrouded firing pin... some of the commercial carriers are under cut just below the firing pin, so that when the bolt carrier is in recoil,the entire cocking force applied by the carrier to the hammer bears on the firing pin... I had excessive wear on the shoulder of the firing pin on my Colt... there are pics somewhere in the forum... the rear of the carrier has more material so it is heavier than an AR carrier |
This pic shows the basic difference between FA BCGs and others: FA BCG's have nearly the same amount of material removed on the top and bottom for access to the firing pin. Semi- BCGs can have any amount of steel machined off the bottom side. To make an FA AR-15 you need a FA sear/Fire Control Group and those are quite difficult and risky to acquire... |
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Quoted:
This pic shows the basic difference between FA BCGs and others: FA BCG's have nearly the same amount of material removed on the top and bottom for access to the firing pin. Semi- BCGs can have any amount of steel machined off the bottom side. http://ar15barrels.com/tech/ar15carriers.jpg To make an FA AR-15 you need a FA sear/Fire Control Group and those are quite difficult and risky to acquire... No desires for full auto. I live in maryland lol. I just wondered what the difference was. Thanks |
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