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Posted: 11/16/2007 12:29:35 PM EDT
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did anyone see the open bolt ar on futureweapons. anyone know who the fire system in it is set up? futureweapons sucks they forgot to say that the saw takes ar mags |
| I don't understand the question either, but it is the LWRC IAR. And in Semi-auto it fires from a closed bolt. When the selector is switched to full-auto it fires the 1st round from a closed bolt and all the subsequent rounds are fired from an open bolt. Once the selector switch is moved to semi or safe the bolt closes. |
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here is a video of it showing it being fired from an open bolt youtube.com/watch?v=T-VX4M_jgSk |
If you want to know the exact mechanics of how it works, you're not going to find that out unless the military adopts the IAR and you enlist and end up with one. Open-bolt auto and closed-bolt semi out of the same gun is a pretty big deal, and LWRC isn't about to go blabbing about how exactly they accomplished it. |
| this seems like a stupid idea for a combat rifle to me, i understand the concept for better cooling for auto fire and what not, but what happens when you get mud or dirt, or debris thrown into the rifle from any number of things that can occur in a combat enviroment, or when you drop to go prone. |
Ok I get the cooling thing but if you watch the video, they guy keeps looking at his gun to see if he's out of ammo. When he is out of ammo he doesn't know it until he looks. Seems like a good way to get killed to me. |
Well open bolt machine gun, and submachine gun, designs have been used for over 100 years, so I'd say the .mil isn't too worried about it. 
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I am a machine gunner by trade and when I patrolled or went on a convoy in Iraq I kept my bolt forward, rounds ready on the feed tray. When I need to shoot it was a quick racking of the bolt to lock it to the rear. That kept out all the crap. That video was cool!  IMO you dont need an open bolt M16 rifle.
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| interesting...though I do see the one posters point about how stuff could get into the action and cause a jam/failure a lot more easily. open bolt designs still don't make sense to me...and by that I mean how they operate. does the hammer ride/follow the bolt or is it more of a latch holding the bolt back that drops out of the way when you pull the trigger? |
| Well, a true open-bolt like the Tommy gun has a fixed firing pin. The bolt is opened prior to firing and the trigger releases it to load and slam-fire. On this combination deal, it has to have exactly the same bolt/firing pin set-up as current M16 in order to fire from the closed bolt. That would mean it needs a disconnector to retard the hammer until the bolt is locked to fire from the open bolt along with another device to let the trigger release the bolt + hammer. I'm not a MG guy but I think this would be correct. |
All our machineguns are already open bolt so how is this any worse than what is currently being used? Plus you just flip past semi to safe when you want to move and the bolt closes. Drop to ground and go to full auto and it will be closed untill you fire and then be open bolt. The goal is to allow more fire power from a larger portion of the squad without resorting to exchanging riflemen for machine gunners. You get semi auto accuracy and light weight of a rifle with limited full auto machinegun ability in one package. A SAW will not be as accurate or as lightweight, a rifle not able to fire as much full auto. |
The FG42 is one that comes immediately to mind as firing closed-bolt semi, open-bolt auto. The bolt carrier had two notches, one front and centre, one to the rear and side. The selector lever acted to move the sear side to side. When the selector was set to semi, the sear was off-centre, and engaged the rear sear notch on the carrier, so the carrier was mostly forward and the bolt locked. Pulling the trigger dropped the carrier, which went forward the last few mm, and a ledge on the carrier struck the back of the firing pin, driving it forward to fire the rifle. When the selector was set to full, the sear was centered, and engaged the forward notch on the carrier so it was held almost all the way back and the bolt was open. Pulling the trigger dropped the carrier and it slammed forward, stripping and chambering a round, locking the bolt and striking the firing pin in one smooth motion. |
Dust cover? Now you know why. |
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