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Posted: 9/8/2012 12:20:39 PM EDT
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I know that this is illegal in the U.S. unless its a registered machine gun, but what is the purpose of it?
Reason being, about a year ago I was in Afghanistan and our armorer tried putting a Type-56 (with an underfolder) back together, but he screwed up the trigger group, so after about 10min of fooling around with the trigger group I got the thing back together, but I remember seeing the third pin in there and just couldn't figure out what purpose it served. |
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Auto-sear pin? That. Auto disconnector. Works on the same principle as the auto sear on the M16 which you should be familiar with. On the AK, don't confuse it with the receiver reinforcement rivet or whatever its called though ya definitely didn't confuse that part, but honestly I am not familiar with how the auto sear works, if anybody could fill me in on that also: so if the third pin acts as a way of preventing OOB discharges on semi autos.... why does the ATF make some of the dumbest decisions ever? |
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Because without it the hammer will fall too soon, thus riding the rear of the bolt all the way up and not have enough force to reliably pop the primer.
This is assuming the FA disconnector is held out of battery with the FA selector being in the middle position. Every time you would fire a round and hold the trigger, the expended round would be expelled and the subsequent round would be loaded but you would have a decocked hammer. You would have to manually charge every shot AND you would be ejecting 50% of the live rounds. |
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Quoted:
Quoted:
Quoted:
Auto-sear pin? That. Auto disconnector. Works on the same principle as the auto sear on the M16 which you should be familiar with. On the AK, don't confuse it with the receiver reinforcement rivet or whatever its called though ya definitely didn't confuse that part, but honestly I am not familiar with how the auto sear works, if anybody could fill me in on that also: so if the third pin acts as a way of preventing OOB discharges on semi autos.... why does the ATF make some of the dumbest decisions ever? I have a very rudimentary knowledge of this but in semi-auto the hammer is held back until you squeeze the trigger again. There is enough time for the bolt to completely go into battery before you squeeze the trigger again so an OOB discharge is very unlikely to happen in a semi-auto only AK's. The next time you have your hands on a select fire AK, take off the top cover and run the action manually. Do it with the selector in semi-auto and full-auto and you'll see how it all works. There is a machine gun rental at the indoor range I shoot at occasionally. |
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Quoted: also: so if the third pin acts as a way of preventing OOB discharges on semi autos.... why does the ATF make some of the dumbest decisions ever? Because it holds the parts that allow proper FA fire. Using it to make a SA marginally safer is great, but it is an added feature on rifles that use the system. You could add a sear hole on an AR and use it to attach a side sling mount, but just because there is a legal use, that doesn't make it kosher in their eyes. You could make a perfectly good open bolt semi version of an SMG, but it is "too easy" to make full auto. I agree. I disagree that FA should even be regulated though. |
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The difference to the ATF is that if you already allow a "safety sear", all you need for FA fire is about 1/8" of a tail on the back of a disconnector.
The way they restrict it now, you have to drill the hole for the third pin, cut a hole in the top rail, and track down or fabricate the FCG parts. In short, it's a lot harder. The prior way would take about 5 minutes to convert, and the current way would take about an hour. Big difference apparently. |
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The tab that protudes from the back of the bolt carrier keeps the AK from firing OOB. If the bolt is not locked in the trunion the hammer will hit the tab this prevents the hammer from striking the firing pin. Kalashinkov designed it this way. A semi only AK is perfectly safe without the auto parts.
The auto sear on the thrid pin trips the hammer when the bolt closes when the selector is set to FA and the trigger is held back. One of the most simple designs for a select fire rifle. |
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