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My Background The M4 is my first shotgun, and I have never taken a formal training class with it. My M4 haD less than 200 rounds through it before this class. My Equipment The Shotgun M4 with a steel 7 round tube, C-stock in the middle position, and the following mods: Surefire Dual Fuel Light on an IWC QD Mount GG&G Bolt Release TTI Shell Lifter Aimpoint T2 on ADM Low Mount FFT Trigger Set and A&S Housing IWC QD Rear Mount VTAC 2 Point Sling Tactical Gear SOE 12 GA Micro Rig The Class This was a “Basic Tactical Shotgun” run by a well-regarded local outfit that I’ve trained with before. It’s the first of a three class progression. This class focused heavily on a handful of items: Understanding how the shotgun patterns and functions at different distances and with different loads. We ran a variety of 00 Buck, #4 Buck, and slug loads at 7, 15, 25, and 50 yards. We then ran the slugs all the way out to 100. This was done from standing, supported kneeling, and even prone position. Learning how to do combat and speed reloads. This was a major emphasis of the training and one that was eye-opening for me. Dynamically loading while engaging multiple reactive targets was fun. Doing “slug select” drills to dynamically change out the round that you have. Concluded with a “shoot house” engaging paper targets The temperature hovered in the low to mid 90s for most of the training, requiring us to build in plenty of water and cooling breaks. Lessons Learned Know what ammo your gun likes: I can say with confidence that I’m never using Fiocchi #4 Buck again. Had multiple, repeated failures to eject/extract that led to a lot of (unexpected, but valuable) experience in failure clearance drills. This was not an issue with either my Federal Tactical slugs or PMC 00 Buck. Malfunction drills require a lot more thinking than an AR or a handgun: It’s not as easy as “tap, rack, bang” with an M4. For example, FTEs because of an extended crimp are not as simple as cycling the bolt and smacking the receiver. Getting a live round back into the chamber once you clear also requires practiced discipline with the manual of arms. You feel every ounce of weight you drop off of this platform: The M4 is a heavy beast, especially when you’re using it for several hours during a 90 degree day. Dropping the Mesa side saddle helped, but I’m looking forward to replacing my steel tube with a titanium one. I may even SBS this thing and drop down to 14” barrel. This is an impressively accurate gun: With a 2 MOA red dot and Truball slugs, I was making consistent spine box hits at 75 yards, and was hitting “minute of man” at 100. I was not truthfully not expecting that out of this gun. For my fellow lefties, you have to work on modifying manual of arms: While the safety can be swapped and things like combat reloads might be easier because of visibility into the bolt, other drills are not. For example, grabbing a round off of a chest rig to do a slug select can be tricky. You have to rotate the gun, tuck it into your armpit, use your left hand to current round and hold it open long enough to drop in the new slug. Anyway, it was a very eye opening experience for me. I’m still sore (birdshot didnt come in in time, so ran the entire course with buck and slugs) and a touch dehydrated, but well worth the time and energy.

So I got the carbon fiber tube. It is pretty lightweight and feels solid. However I did run into some issues. We’re you able to install the spring retainer? My magazine follower had to be tapped in to fit. There is now way the retainer will crush enough to fit though.

Don't know if these help - since the forend takes up most of the barrel length.

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

Talked myself into it and ordered one up for the H2O.

Good job! I’m trying to convince myself to spend the money and buy one of those Briley carbon fiber magazine tubes. I think that will look awesome on my H2O build. Plus cut a little more weight off the front.

SUCCESS! Thanks for the encouragement everyone. Now I am part of Team Uber-Mag-Tube!