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Glad to see that manual on my G-Drive is of use to people! ?

“Carrier Loading” (aka Ghost Loading). See page 24 of the USMC M1014 manual LINK to USMC M1014 manual

The LE mag tube (Benelli OEM) is steel and parkerized (???). Some commercial options (with carrier comp being highly recommended) use titanium so you save weight and have fewer corrosion concerns. There are other good commercial steel and titanium options too... I'm just not sure which ones are currently being made

That's more in the clay / bird hunting /sporting side of things... but here's another forum's take on the topic https://www.shotgunworld.com/bbs/viewtopic.php?t=210620

1. First time I installed it, it did move while practicing dummy loading. It was because I had only slightly tightened it. After that I tightened it down well and it hasn’t budged after many life fire training sessions and a match. I’m easily over 1000 rounds with it on. Make sure you tighten down the magazine tube cap first, and check that barrel is seated properly against receiver, before tightening set screws. Otherwise the front set screws will sit on the edge of the front mounting location. 2. They have not moved. They do leave a small “dimple” in the finish of the front set screws. Doesn’t bother me but it could bother some. I actually went and made a small recess with the Dremel, so that the set screws have a fixed location to grab. 3. I used blue loctite and it has worked well. Hasn’t loosened, and wasn’t an issue removing forend. I have removed it several times and haven’t had to reapply loctite yet. Like many, I agree that it’s not a great setup with the set screws, but I do like the feel of the grip and Mlok feature. Until something better comes out, this has been doing the job well, despite having to use tools to strip down the shotgun.

I picked my M1014 up on June 19th (pistol owner but was my first shotgun), this forum has been most helpful to Scout’s point. If you search and don’t find what you’re looking for, just start a new thread with your question. As maybe the newest member to the M4 Club myself, welcome (and I hope you’ve set a budget for modifications that you’ll stick to). -Rex

I like modified for that... though some might suggest improved cylinder if you'll be shooting slugs more often. In the beginning avoid cheap birdshot until you've broken in the springs for a bit. I generally shoot federal buckshot and slugs... but I can't think of any horrendous ammo. Lately I've carried brenneke and ddupleks slugs due to bear concerns. I prefer a single tube... though you'll have to remove that pesky red loctite to get the original one out. If that's a concern the extensions work fine. There's a lot of info on the website... some images might be down from the older posts but that's usually not too big of an issue to deal with. Enjoy your new boomstick

Wow. Thanks for that manual. The "book" that come with the Benelli M4 is fine but this USMC manual is exactly what I needed/wanted.

Thanks Steve, this is phenomenal.

The M4 is not "drop safe". When the safety is engaged, it merely blocks the trigger from being pulled. The sear or the hammer for that matter, is not captured in any way to prevent the hammer from falling should the gun receive a violent blow. I never keep a round chambered, I maintain a full magazine and one on the shell carrier when in home defense mode.