Lwrc Piston Iar

[mohica]

The text at the end of the video is great! LWRC Semi - closed bolt Auto - open bolt. This could be the next latest and greatest.


http://www.youtube.com/watch?v=T-VX4M_jgSk (http://www.youtube.com/watch?v=T-VX4M_jgSk)

[bvvelzen]

What does open and closed bolt action mean?

[jonosk]

This is a german song, but ok video, what are they shooting at.

[ZoneOne]

http://www.lwrifles.com/tech.php

Interesting

[kutter]

What does open and closed bolt action mean?

Open bolt means that the bolt is in the rearwards position and the round is still in the magazine until you need to fire it (after which the bolt moves forward and chambers the round). With a closed bolt the bolt is in the forward position and a round is in the chamber.

The reason for the two firing methods is that a closed bolt is suppose to result in greater accuracy due to the shorter lock time and generally less movement when the gun is fired. When accuracy isn't as much of an issue an open bolt is often used since it helps prevent cook off of a round (i.e. a bullet firing prematurely)due to a hot chamber.

Probably one of the best known rifles to use the closed bolt-semi, open bolt-auto principle was the FG42.

[Sneeker]

Thats why I love this place, you learn somthing new every day.

[John Crighton]

Why the heck would you want a open bolt version of something that is already a dirt trap?

Sounds like an answer to a question that should never have been asked.

[Durandal]

Why the heck would you want a open bolt version of something...?

Sounds like an answer to a question that should never have been asked.

Because it is a VERY simple design. Its used in the M249 SAW and the Thompson. Its been in use for 100 years...maybe a bit more.


Edit: I honestly do not know when the first open bolt design was.

[John Crighton]

Because it is a VERY simple design. Its used in the M249 SAW and the Thompson. Its been in use for 100 years...maybe a bit more.


Edit: I honestly do not know when the first open bolt design was.

I think the first open bolt was some Italian Sub-gun in 9mm towards the end of WWI. I may be wrong though.


I understand the concept of the open bolt, I have an Mp-40, PPsh, and PPS-43.

Quote me properly and you will the the reason for my dis-interest in the design.

(Resident AR-15/M-16 hater who owns 4)

[Durandal]

I think the first open bolt was some Italian Sub-gun in 9mm towards the end of WWI. I may be wrong though.

Maybe, though I think the Lewis Gun was an open bolt not too sure when the first model of each was prototyped though.


I understand the concept of the open bolt, I have an Mp-40, PPsh, and PPS-43.

Not a pissing contest here, but what the heck, have fun.


Quote me properly and you will the the reason for my dis-interest in the design.

I think even if I quoted you completely getting to the exact meaning of your comments will require some deciphering.

[John Crighton]

Maybe, though I think the Lewis Gun was an open bolt not too sure when the first model of each was prototyped though.



Not a pissing contest here, but what the heck, have fun.

I think even if I quoted you completely getting to the exact meaning of your comments will require some deciphering.

Not sure about the Lewis. Never really looked at one close enough. I will be at a WWI reenactment this weekend to watch. I'll take a look at one there.

My main 'complaint" is that the AR/M-16 system craps where it eats. Direct gas back into the bolt, thus causing the need to spend way to much time cleaning the damn thing. I could never trust my life to one.

The open bolt would have a better feel when firing if it feels anything like a sub-gun. Still, I just don't see the need. In the middle east I would think it would be more chance for dirt and dust to get in adding more down time and unreliability to the weapon. For SWAT, it might be a good weapon, but again I just don't see the need.

Just my opinion, take it for what opinions are worth.

[dobrodan]

Not sure about the Lewis. Never really looked at one close enough. I will be at a WWI reenactment this weekend to watch. I'll take a look at one there.

My main 'complaint" is that the AR/M-16 system craps where it eats. Direct gas back into the bolt, thus causing the need to spend way to much time cleaning the damn thing. I could never trust my life to one.

The open bolt would have a better feel when firing if it feels anything like a sub-gun. Still, I just don't see the need. In the middle east I would think it would be more chance for dirt and dust to get in adding more down time and unreliability to the weapon. For SWAT, it might be a good weapon, but again I just don't see the need.

Just my opinion, take it for what opinions are worth.

The LWRC IAR is a piston-gun... Not DI.

Well, both the M249 and the M240 are open-bolt guns, so I can´t really see why the IAR should be any worse off, especially as it is carried locked and loaded with the bolt in closed position until the action starts... Also, it is not open to the environment the same way as a beltfed necessarily has to be. The mag is in the magwell, the dustcover is locked, and you could have something like a condom on the muzzle... A

[yiorgo]

http://lightfighter.net/eve/forums/a/tpc/f/7206084761/m/2161012243?a=tpc&s=7336015661&m=2161012243&f=7206084761&ORIGINAL_REFERRER_URL=http%3A%2F%2Flightfighter.net%2Feve%2Fforums%2Fa%2Ffrm%2Ff%2F7206084761



read up

[John Crighton]

I missed the gas piston part. [:(] I find this interesting and am looking into converting my rifles into gas piston. Don't know if it is worth the price though.

I still just don't see what NEED this fills.

[11B101ABN]

I missed the gas piston part. [:(] I find this interesting and am looking into converting my rifles into gas piston. Don't know if it is worth the price though.

I still just don't see what NEED this fills.

Its an entry into the USMC automatic rifleman trials. Supplements the SAW. Sort of.

[dobrodan]

According to LWRC, their IAR-candidate weighs in at 8.75lbs without optics (and probably magazine and bipod as well) Not exactly what I would call heavy!

Compare that to the Ultimax which weighs 10.5lbs...

[maw]

According to LWRC, their IAR-candidate weighs in at 8.75lbs without optics (and probably magazine and bipod as well) Not exactly what I would call heavy!

Compare that to the Ultimax which weighs 10.5lbs...

ultimax a switchable barrel, that'll add some weight. iar barrel is fixed. the Marines are looking at 4 column stacked magazines as opposed to a drum (like a c-mag). magpul has some in the works.

ultimax vs. iar. tough call.

[FromanMD]

The Ultimax is arguably the most user friendly and fast handling LMG ever devised but it's still no M4 in the handling department.

The Open Bolt Colt LMG was the first attempt at allowing the M16 platform to run hard without cookoffs(rounds detonating upon exposure to the heat of a orange hot chamber) but it still used the dirty direct impingement gas tube through a tiny steel straw that would actually melt with enough continuous firing!

A piston system,a heavy duty extractor and an open bolt trigger mech would take the M16 squarely into LMG territory and if they could keep the weight down they could have a real winner on their hands.

Sustained fire coupled with the superior handling and controls of the M16 and the reliability of a Kalshnikov or SIG550 would allow every man on a fire team to take up the suppressive fire role from the most advantageous position without having to set up for your suppression.

Hot stuff if you ask me but I'd still like to see a stronger bolt and extractor system in a weapon expected to work that hard continuously.

[Andy-M]

LWRC IAR photos

http://www.lwrifles.com/forum/viewtopic.php?t=1138&highlight=

[FromanMD]

LWRC IAR photos

http://www.lwrifles.com/forum/viewtopic.php?t=1138&highlight=

Thanks for the link!!

That's a great looking system with a barrel that looks like it could be a driveline component in a battelship :)

I might have to look these guys up..

[loganinkosovo]

The Johnson was also a closed-bolt open-bolt design.