300 Whisper Feed Problem

[cpd23]

Hello all
I have a feed problem with my new ar-15 build. I have read a lot and seems to be a few standard ideas going to fix the issue. Increase the gas port size to match the block. Work with the loads for the gun. Change to a pistol gas port system. I have found info about everything but how to do the pistol gas pot. So what would you suggest to do next. Thanks in advance

[Spook]

open the port you have to.120 and use AA 1680 powder. should function with any of the slower fast powders.

[rsilvers]

Is this a 16 inch barrel?

[cpd23]

Is this a 16 inch barrel?

Yes it is silver.

[Titleiiredneck]

Yes it is silver.

Is the port in the carbine or pistol location?

[cpd23]

Is the port in the carbine or pistol location?

I do not know the difference Titleiiredneck. Been trying to figure that one out.

[cpd23]

open the port you have to.120 and use AA 1680 powder. should function with any of the slower fast powders.

Thanks Spook what load recipes are you running withe the .120 port?

[Sami]

Thanks Spook what load recipes are you running withe the .120 port?

I drilled my gas block with 7/64" bit. Carbine length position, 16" barrel. 11gr of AA1680 is around 1050fps and cycles the action.

[Titleiiredneck]

Glad it works!

[cpd23]

I drilled my gas block with 7/64" bit. Carbine length position, 16" barrel. 11gr of AA1680 is around 1050fps and cycles the action.

Thanks for the info Sami. The load info really helps at least I have one that I know that works.

[Shadow 300]

I do not know the difference Titleiiredneck. Been trying to figure that one out.

So if you have a AR 15 chambered in 300 BLK shooting subsonic Remington ammo will it matter where the gas port is positioned? Will barrels currently available be drilled to a port size that results in reliable operation of the weapon in semi-auto, full auto? I guess what I am asking is if the apparent mystery of assembling a bunch or purchased parts and having them cycle reliably is over?

[kdiver58]

With my gas port in the normal position and drilled to .120 it runs fine and feeds fine with 11 grains of AA1682 .

Here is some old video with even less

http://www.youtube.com/watch?v=zn8gl13XdZ0

[rsilvers]

So if you have a AR 15 chambered in 300 BLK shooting subsonic Remington ammo will it matter where the gas port is positioned?

No, Remington subsonic ammo works with both gas port positions.

[Shadow 300]

No, Remington subsonic ammo works with both gas port positions.

Thank you! That is the answer I have been looking for. I really do not have time for reloading nowadays so Remington / AAC coming out with this cartridge, for me, is a great thing.

[cpd23]

With my gas port in the normal position and drilled to .120 it runs fine and feeds fine with 11 grains of AA1682 .

Here is some old video with even less

http://www.youtube.com/watch?v=zn8gl13XdZ0

Thanks guess its time to drill.

[cpd23]

Thanks everyone. Here is a list of what I have done to get things working great.

1 Drilled the barrel gas port to .120
2 Replaced gas block with adjustable gas block.
2 Load 11.8 grains for accurate 1680 Sierra 220 grain match bullets

Results 1042 fps 3.49 deviation on 10 rounds with a 1 inch group at 100 yards. Cycled with out any problems slow or as fast as I could pull the trigger.

[Hoser]

Cool.

Glad to know it all got worked out.