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The M4 is pretty drop safe. I was concerned about the design years ago. So I unloaded it and repeatedly bounced the gun on the carpet in various angles to try to get the hammer to fall. It never happened. You’d need to throw it hard enough for the trigger to be pulled in order for the hammer to drop I don’t think you could shock the hammer to get past the trigger hook or the disconnector if it rebounded enough. What I use the safety. Round in the chamber, magazine topped off. I don’t mess with ghost loading since I’ve seen it cause malfunctions. I use a larger DMW safety that I can feel poke my trigger finger when the safety is engaged. It’s instant feedback to know its condition. I also trim 1.5 coils from the spring so that I can press the safety without breaking my firing grip. It’s still firm to press, but not factory straining firm. As a certified firearms instructor, I should add some comments about safe storage. I’d urge everyone to store their firearms in some kind of safe even if you don’t have children. A cousin of mine when he was 3-4 went to someone’s house who didn’t have children and they had the shotgun leaned against the back of a door. No one thought of the gun and he went and grabbed it being young and not knowing any better. He pressed the trigger and the shotgun discharged thru the roof right next to his head. He was fine, but it could have easily not been. The only victim that day was the sheet rock in that guy’s trailer along with his pride. There are a bunch of cool high speed locking systems out there now with biometrics and back up PIN numbers. They have them for rifle and shotgun storage now, not just pistols. They’re not meant to protect against theft, they’re meant to keep the firearm out of unauthorized users’ hands and keep them accessible to you if needed. From a training perspective, if the firearm has been out of your immediate control for any length of time, should you trust that it is still in the condition you left it in? No one wants to spend a couple hundred bucks on a lock box. Most of them suck anyway, but what if you got one that presented the pistol grip to you so you could draw it easily with the trigger guard covered? Sweeping a loaded pistol off a night stand in the dark can be a safety issue. Did the cat jump on it and move the way you position it? Depending where you live can add another layer of culpability if an unauthorized user gets ahold of one of your firearms. Even if they’re a burglar. Having at least this second layer of protection will help keep you out of trouble when LaShawn steals your gun and smokes the cashier at the Stop & Rob.

The front sling plate looseness is normal... at least for the ones I've handled. I've taken it off as I use a flashlight mount that has a qdc option for a sling

Not sure about the sling but the mark on the pin is to help you put it back together. The mark goes towards the front of the bcg.

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.

Hey truckcop, that information is useful, thank you for the different approach. Hey benelliwerkes, how many of your other 302 posts on this forum are useless remarks from the peanut gallery? I expect that this thread will be more useful to others now that we've had this exchange.

You resurrect a thread in which the last post was nearly 5 years ago and wonder if the "problem" has been addressed. I submit to you that under those circumstances there is no problem. But let me try another approach. I have 3 Benellis that have the sling attachment to which you refer. Each one gets plenty of use in the field but one in particular has had particularly hard use in hunting using a sling and the attachment, while it does come in contact with the barrel, does not do so in a way that causes damage to the finish of the barrel. Here's a pic of the area in question. This gun is over 20 years old. If you get a magnifying glass you might be able to see where the sling mount is coming into contact with the barrel. Like I said. It's not an issue.