There are several reasons regular joes can own M16 FCG. Repairing exisiting FA weapons, making dealer samples, etc. Now owning the FCG and an AR-15 is asking for trouble unless you have proper permits. I've heard stories of people getting in trouble (don't remember how much trouble) for having spare M16 parts to repair/replace worn parts on their legal FA guns when they have seperate AR-15s as well.
As for the Ruger being converted to FA, some methods are simple and some are very complicated. The norrels actually uses a modified hammer, trigger and bolt. The trigger packs gets slightly modified and a spring loaded detent is added to the bolt. A trip is milled into the bolt and an autosear placed into the trigger pack. I believe the Norrel's group doesn't modify the receiver. There are at least four other FA mods that I know about for the Ruger 10/22. One is an open bolt and uses a special humped sear and trigger pack inards. Another uses a lever on the side of the receiver (this sounds like the one mentioned earlier). Another uses a selector lever on the side of the trigger and is essentially very similar to the Norrel's but the lever adjust sear engagment to force the sear to stop on semi-auto or trip for full-auto.
I remember reading part of a gun designing book once, and the author made an interesting statement. Making a firearm go full auto is VERY easy, in fact, most FA FCGs are more simple than their semi-auto FCG (due to lack of a disconnect and other essential semi-auto parts). The hardest task in designing a FA weapon is making on that can be easily controled, especially if you want select fire capabilities. It's quite true. Look at the PPSH; it's a trigger with a 90 degree bend and a straight bar as a sear with a hole on each end. That's it. Pull the trigger, the bend pulls the sear down out of the way of the bolt, the bolt flys home under spring tension, fixed firing pin sets off round, bolt cycles to the rear and continues. When the trigger is released the sear gets pushed back up and catches the bolt's forward travel. A trigger, a sear, a bolt, and three springs. The same design but semi-auto would require about 5 parts and several specialty springs.
As for the Ruger being converted to FA, some methods are simple and some are very complicated. The norrels actually uses a modified hammer, trigger and bolt. The trigger packs gets slightly modified and a spring loaded detent is added to the bolt. A trip is milled into the bolt and an autosear placed into the trigger pack. I believe the Norrel's group doesn't modify the receiver. There are at least four other FA mods that I know about for the Ruger 10/22. One is an open bolt and uses a special humped sear and trigger pack inards. Another uses a lever on the side of the receiver (this sounds like the one mentioned earlier). Another uses a selector lever on the side of the trigger and is essentially very similar to the Norrel's but the lever adjust sear engagment to force the sear to stop on semi-auto or trip for full-auto.
I remember reading part of a gun designing book once, and the author made an interesting statement. Making a firearm go full auto is VERY easy, in fact, most FA FCGs are more simple than their semi-auto FCG (due to lack of a disconnect and other essential semi-auto parts). The hardest task in designing a FA weapon is making on that can be easily controled, especially if you want select fire capabilities. It's quite true. Look at the PPSH; it's a trigger with a 90 degree bend and a straight bar as a sear with a hole on each end. That's it. Pull the trigger, the bend pulls the sear down out of the way of the bolt, the bolt flys home under spring tension, fixed firing pin sets off round, bolt cycles to the rear and continues. When the trigger is released the sear gets pushed back up and catches the bolt's forward travel. A trigger, a sear, a bolt, and three springs. The same design but semi-auto would require about 5 parts and several specialty springs.
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