How to make AR15 selector point at full auto spot?

sky52 said:
make expensive noises with 300blk match ammos. HOWEVER, 300blk were meant to run in a short barrel setup, 14" and below. Most 16" 300blk barrels run a pistol length even though the real estate is there to allow for a carbine or even mid length. problem is the powder burn rate, by the time it gets to the 7inch mark. Most gas pressure have been lost already.
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Peak pressure is reached at around 7-10" in most cartridges. As long as the pressure after that is enough to overcome friction between the bullet and the barrel, it will continue to accelerate.

Similar to how .22lr gets max velocity out of 16-18" barrels. Any longer, and the small propellant charge doesn't produce enough gas volume to fill a 20'+ barrel and keep accelerating the bullet at the end of it.
 
MkivSupra said:
my 9" 300 blk looks tiny, interested to see how this turns out
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Pics bro? :)

You ever try and run it on subsonics? If so how'd she do?

Thanks!

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JoeShmow said:
What's the advantage of a full auto selector when the full auto option is unavailable?
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Only because the receiver is marked for full auto, so I'd like the selector to be able to point at that. If it wasn't marked I wouldn't care. I did see a trigger group that offered an extra feature when the selector is set to full auto (forceful trigger reset) but I don't think that's the trigger group I'll be running.
 
dirtygrandpa said:
Only because the receiver is marked for full auto, so I'd like the selector to be able to point at that. If it wasn't marked I wouldn't care. I did see a trigger group that offered an extra feature when the selector is set to full auto (forceful trigger reset) but I don't think that's the trigger group I'll be running.
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Will hammer not follow the bolt if you do not file down the disconnector rib on the full auto selector?
 
Suther said:
Why would it shoot bad? 5" is common, or even long for a pistol barrel and they shoot just fine? 2" pistol barrels put enough spin to stabilize bullets...?
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To each their own, I have a 4.5" .223/.5.56 setup with the barrel made by the same company Veritas. I personally do my restricted shooting indoors at a 25M range, so for those that think my 4.5" barrel is useless, I say the same for ones bringing 20" barreled rifles to shoot at 25M, not useless but a bit overkill for that range. Above all its a range toy, I enjoy shooting it. And at 25M it still makes round holes and the bullets aren't tumbling

One thing to keep in mind when your comparing short barrels for pistols vs rifle cartridges is the length of the ammo. A 9mm round in a 4.5" barrel is going to have more rifling after the chamber then a .233/5.56 or .300 because the rifles cartridges are much longer then most pistol calibers. For instance with my 4.5" there is very little barrel and rifling after the chamber
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Take into account if you have a lower marked for full auto it is considered or can be considered a prohib item, even if it can’t accept a full auto trigger group.
 
R711 said:
Take into account if you have a lower marked for full auto it is considered or can be considered a prohib item, even if it can’t accept a full auto trigger group.
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How, exactly. Also please provide an example of this ever happening. As long as the receiver is a semi and has no (incorrectly, or otherwise) placed mark for the auto sear, it's a semi.
 
R711 said:
Take into account if you have a lower marked for full auto it is considered or can be considered a prohib item, even if it can’t accept a full auto trigger group.
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I looked all through the regs and can't see this. It says if it's semi it's semi, if it's full it's full, doesn't matter how it's marked, just how it functions. I'm sure a z tech armory wouldn't import them if they were prohib.
 
Ask Bartok5 he had to hand in a receiver which had the Full-auto engraved on it and a fake pin engraved as well, still a semi only receiver. Plus, there have been numerous posts about it here on CGN
 
R711 said:
Ask Bartok5 he had to hand in a receiver which had the Full-auto engraved on it and a fake pin engraved as well, still a semi only receiver. Plus, there have been numerous posts about it here on CGN
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It was the fake (and incorrectly placed) pin engraving, not the fire control positions that were the issue - apparently the concept of timing a full auto is lost on the lab. There have been a fair number of 3 position marked receivers sold in Canada, none of which were prohibited.
 
enefgee said:
It was the fake (and incorrectly placed) pin engraving, not the fire control positions that were the issue - apparently the concept of timing a full auto is lost on the lab. There have been a fair number of 3 position marked receivers sold in Canada, none of which were prohibited.
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Yep, this is what it was. For quite a while the false autosear pin location has been a deal breaker, supposedly it makes it easier to locate and drill the pin, even if your lower is the high shelf lowers that won't accept the auto sear... excessively stupid but it's what we have to deal with.
 
enefgee said:
It was the fake (and incorrectly placed) pin engraving, not the fire control positions that were the issue - apparently the concept of timing a full auto is lost on the lab. There have been a fair number of 3 position marked receivers sold in Canada, none of which were prohibited.
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I know of a Canadian online store that has 6 different 3 position marked lowers for sale on their site. Most Ranier Arms lowers and Sharps Bros lowers are 3 position marked, and like you said have been sold in Canada
 
Oh baby, thanks Rangeview Sports!!

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irunguns is going to import a 4.75" barrel for me, and I have a beautiful 4" handguard/barrel nut on the way for it, should be super tight.
 
JohnnyP636 said:
I know of a Canadian online store that has 6 different 3 position marked lowers for sale on their site. Most Ranier Arms lowers and Sharps Bros lowers are 3 position marked, and like you said have been sold in Canada
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I had a Spikes lower with the 3 position markings too.

As long as it's not a low shelf lower, or has the third pin hole marked on it, you're GTG.
 
R711 said:
Take into account if you have a lower marked for full auto it is considered or can be considered a prohib item, even if it can’t accept a full auto trigger group.
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WOW, this is an unbelievable crock of horse ####. Please provide a link to where this is indicated in the CCC or the FAA?

Perhaps in future if you choose to post such a bold statement, have some more information available to back up such a statement.
 
I bought an FN M16 collector series last year and it has the full auto marking on the reciever
The switch doesn’t move to the full auto spot however
I remember the gun coming with a separate notice saying that the full auto was non functioning and basically there just for the appearance, I’m guessing that paper is there to prove to the authorities that that’s how the firearm was made and shipped and it’s perfectly legal
 
Twan said:
Nope, an auto selector just allows the safety to function as Fire - Safe - Fire.
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Incorrect. faizi is correct. If you use a FA disconnector with a three position safety the hammer will follow the bolt. You must either mod the safety, the disconnector or both. This is not an issue with a standard semi disconnector like the OP is using but some may simply buy a complete FA trigger group.
 
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