LWRC gas piston IAR candidate

3 · Post by 3 » Sun Oct 07, 2007 8:27 pm

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

JohnnyC · Post by **JohnnyC** » Sun Oct 07, 2007 8:45 pm

That's kinda interesting.

Blaster7Romeo · Post by **Blaster7Romeo** » Sun Oct 07, 2007 8:46 pm

So what are the advantages to having it shoot auto with an open bolt and semi with a closed bolt??

3 · Post by 3 » Sun Oct 07, 2007 8:47 pm

cook off

ArevaloSOCOM · Post by **ArevaloSOCOM** » Sun Oct 07, 2007 8:54 pm

http://www.m4carbine.net/showthread.php?t=3982

Doc has one and I'd love to get my upper done by them, they charge 600 bucks to convert your AR.

Seems like the people that have them love them and some people just flat out don't like them.

Who knows.

aarudd · Post by **aarudd** » Sun Oct 07, 2007 8:55 pm

Very interesting, I really like how it goes to open bolt for full auto then back to close bolt for semi.

I wonder what modifications LWRC did to the lower? The hammer, sear, disconector and trigger in relationship to the bolt carrier to comadate the open bolt.

3 · Post by 3 » Sun Oct 07, 2007 9:45 pm

The german FG-42 was open/closed bolt.

Wilder · Post by **Wilder** » Sun Oct 07, 2007 10:07 pm

3 wrote:cook off

EXPLAIN!

gunn24 · Post by **gunn24** » Sun Oct 07, 2007 10:12 pm

Wilder wrote:
3 wrote:cook off
EXPLAIN!

Tempature to high in the chamber and igniting the round off!

Wilder · Post by **Wilder** » Sun Oct 07, 2007 10:39 pm

gunn24 wrote:
Wilder wrote:
3 wrote:cook off
EXPLAIN!
Tempature to high in the chamber and igniting the round off!

Got it. I knew that could happen but had not heard it refered to using that term.

mcmillanman5 · Post by **mcmillanman5** » Sun Oct 07, 2007 10:58 pm

How hot would your chamber have to be in order for a cookoff occur? I have seen some m16's ran pretty hard and never seen this happen, however I will say that most of the time no one I have been around leaves a round chambered after doing so.

JustAnotherName · Post by **JustAnotherName** » Mon Oct 08, 2007 12:08 am

it's pretty scary when a cook off happens, believe me i seen it in africa when i training there.

that why you should never point your weapon at anything you don't intend to shoot.

aarudd · Post by **aarudd** » Mon Oct 08, 2007 12:16 am

When I shoot long bursts with the M16 I am very conscious that cook off could happen. Never happen to me but I always make sure a live round is not in a hot chamber.

Open bolt is very nice for LMG, you shoot beta after beta mag stop the bolt is open, still ready to shoot and the chamber is hot and safe, also the barrel is cooling down with a chamber open.

3 · Post by 3 » Mon Oct 08, 2007 10:34 am

A cook off can occur in as few as 210 rounds fired one round per second on a 14.5 in M4 with standard double heat-shield handguards.

mcmillanman5 · Post by **mcmillanman5** » Mon Oct 08, 2007 6:21 pm

3 wrote:A cook off can occur in as few as 210 rounds fired one round per second on a 14.5 in M4 with standard double heat-shield handguards.

Thanks Trey

66yellow · Post by **66yellow** » Mon Oct 08, 2007 6:34 pm

3 wrote:The german FG-42 was open/closed bolt.

So did the FG-42 transition between open and closed bolt just by manipulation of the selector like on this rifle? It's really slick the way the bolt closes when he puts the gun on semi.

It also looked like the bolt-stop continued to work even when it was in open bolt mode. That's way cool!

kalikraven · Post by **kalikraven** » Mon Oct 08, 2007 6:48 pm

Very Interesting....

dflicker · Post by **dflicker** » Mon Nov 12, 2007 1:22 pm

The purpose of this system is a combination of high sustained rate of fire (75 rpm indefinitely) and first shot reliability, which a standard open bolt gun does not have due to the open bolt allowing all kinds of dust and dirt to enter. On conventional open bolt guns 90% first shot reliability is the norm. That is why a SAW gunner is never leads a stack team.