AR15-M16 receiver difference.

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MarkdevCanada

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Hello all:

Just picked up an unfinished AR15 lower for my 2nd build project (my first was a semi 1919A4 which had been tested fired and registered). All I have to do to this “80% receiver” is to engrave the s/n, register it and then machine out the pocket for the trigger group.

My problem is that I was told last week from an RCMP officer with INEST, that the trigger pocket on the full auto version was a bit bigger than the semi version and to be careful not to machine the wrong size pocket. Is this true? All the plans I’ve downloaded seam to have the same size pocket for the trigger group. I was also under the impression that the only difference between the semi auto AR15 receiver and full auto M16 was an extra hole for the auto sear on the full auto versions. Can some one clarify the differences between the two receivers? Photos would be awesome.

Thanks Mark
 
yes they are correct the opening above the selector is wider for a fullauto gun (so the auto trip sear can fit)

just measure a ar15 to be sure and use that width

Im sure you can google it and find pics i know i saw some somewhere online
 
From Quarterbore:

nfa-ar-m16-01.jpg


On the right is an M-16, on the left is an AR-15.

http://www.quarterbore.com/nfa/registeredreceiver.htm

Oh, and try here too:

http://lmgtfy.com/?q=AR15+M16+Receiver+Difference

NS
 
It would seem to me that a receiver that is not drilled for the auto sear pin would be an AR15 receiver, not an M16 receiver. That said, I wouldn't bother locking horns with the RCMP over the matter.

Many AR15 receivers are machined differently from the on in the above picture so as to prevent a drop-in auto sear from being installed. This takes the place of a regular auto sear and requires an M16 bolt carrier and fire control parts to work.

http://www.quarterbore.com/nfa/dias.html
 
It was my understanding that one could machine an AR15 from an 80%with the M16 FCG pocket and everything would be fine as long as it wasn't assembled into a firearm capability of automatic fire.

Perhaps even drill the auto sear hole? The law says it can't be able to fire full auto, it says nothing about if the parts can fit, as far as I know. As long as no full auto-parts are installed, its not full auto and would not be prohibited.

Am I out to lunch on this line of thought?
 
Armedsask said:
It was my understanding that one could machine an AR15 from an 80%with the M16 FCG pocket and everything would be fine as long as it wasn't assembled into a firearm capability of automatic fire.

Perhaps even drill the auto sear hole? The law says it can't be able to fire full auto, it says nothing about if the parts can fit, as far as I know. As long as no full auto-parts are installed, its not full auto and would not be prohibited.

Am I out to lunch on this line of thought?
Click to expand...

In theory that may be correct. But I would stop short of drilling the sear hole. Maybe if you wanted an authentic look, drill the hole and epoxy a pin in place, or something like that. The RCMP has reputation for going a little bit farther than needed.... (*cough* M203 *cough*)

I wouldn't want to mess with it tho...


ETA

oh oh, post 666! :(
 
I talked to the RCMP and forget trying to get a straight answer. It is "not in their mandate" to tell you how you should/shouldn't make the FCG pocket. I was told that if an auto sear CAN fit, its a full auto/prohib reciever. YMMV.
 
Colt RO934 SMG's came from the factory with the rear opened and the sear hole drilled.
It was marked SAFE and SEMI - no engraving for auto

They are on the FRT as restricted -- I owned one and it effectively really was a Full Auto gun without the parts in it.

However from my understanding they will no longer accept that.
It can have a sear hole (for looks)
Or the back opened up

Not both.
 
ya those are the pics i was thinking of


personally id just make it exactly like and ar15 no fake hole or anything


why invite any hassels
 
Does anyone have any pics of lowers that they've machined and have been approved. Most I've seen look like stag's lowers, but I have seen versions that look somewhat like the ar15 pic posted further above (except without the round cutout).
 
Thanks guys. I don’ want ANY problems with the CFC. As it seams that the rear part of the AR15’s trigger pocket I is little narrower, not as deep and the AR15 omits the auto sear hole, that’s how I’ll machine my AR15 lower.

Now about markings, does anyone have any advice on that?
 
I think ATR was told they couldn't engrave "auto" (or a reasonable facsimile) even if it didn't actually go f/a, however, it seems that Dlask has done some s/a lowers with 'auto' engraved on them........so again, YMMV.
I was told (and take this for what it's worth) by the RCMP that all it HAD to have was a serial number. But depending on who you talk to and what day of the week it is, you could get a different answer.
 
Yes, the firearm must have a serial number. The best part is you can make it up.

My aluminum AR180 has the serial number FUC68. Next one will be ####U WENDY.
 
Your question can be divided into two parts. 1 you are walking the line of either building a restricted semi-auto which is close to a full auto. 2 If it isn't in the full auto range then it could be in the converted auto range. Either way, you had better have the money available for court dates if you make an error. People who read the criminal code with the "best" of intention and try to follow it, risk having the whole canadian justice system come crashing down on them! Right now, with the defeat in 2nd reading of the gun bill, they will be looking for something like this.
I have been to court over smg's, and they have lots of matching monies from the tax payer to play with.
 
can14 said:
Your question can be divided into two parts. 1 you are walking the line of either building a restricted semi-auto which is close to a full auto. 2 If it isn't in the full auto range then it could be in the converted auto range. Either way, you had better have the money available for court dates if you make an error. People who read the criminal code with the "best" of intention and try to follow it, risk having the whole canadian justice system come crashing down on them! Right now, with the defeat in 2nd reading of the gun bill, they will be looking for something like this.
I have been to court over smg's, and they have lots of matching monies from the tax payer to play with.
Click to expand...

I was under the impression C391 passed second reading.
 
can14 said:
Your question can be divided into two parts. 1 you are walking the line of either building a restricted semi-auto which is close to a full auto. 2 If it isn't in the full auto range then it could be in the converted auto range. Either way, you had better have the money available for court dates if you make an error. People who read the criminal code with the "best" of intention and try to follow it, risk having the whole canadian justice system come crashing down on them! Right now, with the defeat in 2nd reading of the gun bill, they will be looking for something like this.
I have been to court over smg's, and they have lots of matching monies from the tax payer to play with.
Click to expand...
A firearm that has not previously fired full auto can not be a converted auto.
 
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