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If it's going to be used for home defense, I don't really buy the idea that the rifle needs a sling. I live alone so I won't need to sling it and fetch a loved one or anything. For my purposes, I see the sling as a liability that could get caught up on something or something convenient for an intruder to grab to disarm me. I don't have a sling on my Remington 870 Police for this reason, but am wanting to move to the AR platform as I know it is undeniably more effective. I might add a sling later on to use outside but for now will leave it off.
So a Magpul handguard would be good? If so, what is the best light mount for Magpul handguard? I want the light to be easy to access but not so easy as to cause NDs of the light.
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You can imagine in your head whatever you like, but I can tell you as a law enforcement Defensive Tactics and Firearms Instructor that a sling is what makes a rifle disarm impossible and requires beating the shooter senseless and cutting the sling to perform a disarm. A lack of sling makes a rifle disarm quite simple. And a sling does not ever get "caught up" in or on anything. Slings are needed anytime you need to climb up over or through anything, use both your hands, render medical aid, fight with your hands, etc. As stated, it's like a handgun with no holster.
As for the light, you want one that presents the light as far cantilevered forward as possible and offset high, especially with that short handguard length and excess barrel length forward.
https://www.magpul.com/products/m-lok-cantilever-rail-light-mount-polymer
https://www.magpul.com/products/rail-light-mount-left-or-right
https://www.magpul.com/products/moe-scout-mount-left-or-right
Those are some good MLOK, Picatinny, and MOE options. A 1" ring mount is good. A Scout mount is better. Not just Surefire has Scout models, Streamlight, Arisaka, etc. also have good Scout mount options. I have rifles with all three companies lights and have moved exclusively to scout mounted lights. I found 1" lights shifted in the ring eventually, weighed more, and had fewer mounting options to get the light high and tight where I like it, near 11 O'clock.