M16 Selector on Semi AR15

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t_102

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Is it legal to put a selector on an AR15 which allows you to switch the the "full auto" position? Even though it will still be a semi-auto mode?
 
fenceline said:
Yes. In full auto it will be on safe though. Won't fire.
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This is not true, unless you have an early semi auto trigger that has a block on the rear portion. These are not very common.



I found this on AR15DOTCOM. The rear portion of the closed one blocks the disconnect cam on a standard three position selector. These, or similar, were required on some rifles in the US at one time. Not so in Canada.
 
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C77 said:
This is not true, unless you have an early semi auto trigger that has a block on the rear portion. These are not very common.



I found this on AR15DOTCOM. The rear portion of the closed one blocks the disconnect cam on a standard three position selector. These, or similar, were required on some rifles in the US at one time. Not so in Canada.
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It is true of the one I have. Won't fire when the selector is in the "full" position.
 
I use the "Full Auto" change lever on several of my AR's as being left handed I find the end of the lever sitting on top of my trigger finger when in the fire position somewhat distracting. Swinging it up and out of the way simply feels better.

Scott
 
I have one in one of my AR's. It became SAFE-SEMI-SAFE (as I have no other M16 parts). To get it to fire in the FA position (SEMI) I hear you grind the centre cam off of the selector.

**PIC taken from ARFCOM**

 
wildphil24 said:
I understand the full-auto carrier are common but isn't any parts of an automatic a prohibited device?
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The trigger parts of an AR can be switched with FA M16 parts, including the hammer and an FA BCG is OK too - you may not have an auto sear, and it's just plain dumb to drill the receiver to accept one, but the legality is questionable.
 
The US gets bent out of shape due to "constructive intent" laws. Hence, they seem to shy away from M16 parts in AR15's. I may be mistaken, but here the only parts that would be no-no would be the auto sear, or a DIAS or lightning link (which I think only work on the older SP1 type of BCG's).
 
I would suggest that it is the so-called "drop in auto sear" that might be a prohibited device. It was intended to fit a semi auto AR-15, to produce auto fire when the rest of the trigger parts and bolt carrier were replaced with M-16 parts. A genuine M-16 auto sear will not fit a semi auto AR-15, and cannot be used to convert it to auto without milling out the trigger pocket and drilling the pivot hole, in addition to swapping out the parts.
The "Lightning Link" would be a prohibited device.
 
Brordo said:
The US gets bent out of shape due to "constructive intent" laws. Hence, they seem to shy away from M16 parts in AR15's. I may be mistaken, but here the only parts that would be no-no would be the auto sear, or a DIAS or lightning link (which I think only work on the older SP1 type of BCG's).
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Wondering about this too.

Many commercial AR15's use FA M16 carriers, the use of M16 parts in AR15's stops there in the U.S. because after that they have to deal with "constructive intent" laws.


If you really want to make an M4Gery here, since we don't have all that constructive intent stuff. Could you not use everything short of an M16 auto sear.

Like M16 fire control group, trigger parts, etc...? Hell even drill the third hole/mill out the lower. Until you have an auto sear and install it it would still be semi-auto only.
 
Why would you go through the effort of machining your lower unless you had the intent of installing an auto sear? That is the question that would be asked.
Like most things in life if you can think up a reason that won't make you look like an idiot in front of a judge have at it.
 
The auto sear is one prohibited part.
A lower receiver that has been milled out and drilled for the installation of the auto sear is the other prohibited part as it would be considered a FA firearm.

An auto bolt, hammer with the auto sear notch or auto selector are not prohibited items. Even when all 3 are assembled in a semi only receiver, it still can not go full auto obviously.

In order to have the selector actually function as semi automatic on the "auto" setting in a semi auto receiver, you would also need the auto capable hammer installed with the auto selector no?
 
Brordo said:
I have one in one of my AR's. It became SAFE-SEMI-SAFE (as I have no other M16 parts). To get it to fire in the FA position (SEMI) I hear you grind the centre cam off of the selector.

**PIC taken from ARFCOM**
Click to expand...

you also need the other parts that won't fit as you have to grind out the receiver ie the full auto cuts... It's more then just a switch. Its a few more moving parts plus the space to fit them and holes on the side to hold them in place. I've hand both of them side by side to compare them before and they're very differen't in the way they work now this is a shop that makes guns for the military and they wanted me to see the difference so they showed me. You can also just look it up online as many people have m16 in the Usa. Just search m16 field strip then do the same with an ar 15. You need the right hammer as well it's differen't in how it works.
 
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