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I remember doing that once?. Ordered a set of nice punches and never looked back.

Mine has run fine without a hiccup right from the get go.

After breaking in my M4 I can run pretty much anything. The one I run the most in classes/matches/training is some low brass Winchester #6.

Anyone have any pictures of the CF mag tube actually on a M4?

I routinely run 1145 fps #7.5 1 &1/8 oz through both my m4's. You might have some hang ups in the very beginning but might not.

The first time out I had a few issues with light loads but once the gun had some rounds down it I've not had a problem since. I've mag dumped Federal LE low recoil which is only 1145fps without issue and have run enough through my M4 to be comfortable with it as my self defense load. I would suggest not getting discourage if it's picky to begin with and see how it performs once it's done some work.

From Briley regarding manufacture of the CF magazine tube: We do not make the carbon fiber tubing ourselves but purchase it from a company called Rock West Composites and this is what they say of the carbon we have selected: "The fabric weave "money layer" makes these carbon fiber tubes ideal for aesthetic applications. But this composite tube has all the structural qualities of unidirectional tubing with an outer woven fabric ply. Additionally, the carbon fabric outer layer helps minimize fraying and splintering during cutting and/or drilling operations." We have used this carbon fiber extensively to manufacture magazine extension in a variety of lengths for a number of different auto shotguns. We use this carbon as it is also machinable as we do not glue the carbon to it's steel or aluminum adapters but rather thread it. We use the same shallow thread technology we developed on our thin wall chokes to thread the carbon. The carbon is then threaded into it's individual adapters used for either magazine extensions or in the case of the Benelli M4 for the magazine. We know that carbon is very strong and tough as we have also experimented making barrels for our sub gauge tube sets. The carbon will retain the pressure when used as a shotgun barrel but the resin used to bond it is eroded by the heat over a period of time making it unsuitable for the application. The carbon used on magazine extensions is subject to repeated muzzle blasts without any adverse effects as they generally extend beyond the muzzle of the barrel. To date we have purchased several thousand feet of carbon tubing and converted it into magazine extensions. We have yet to have a complaint about the carbon discoloring to gold??? Our sponsored 3 gun shooters have never mentioned this problem. Either way we are always open to hearing of any issues related to our products but at this time we are unaware of any issues related to discoloring. Thanks. Claudio Salassa 1230 Lumpkin Road Houston, Texas 7704