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Posted: 3/21/2016 11:44:55 AM EDT
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There are quite a few threads on handguards , but I didn't see one specifically about attachment types and durability. The barrel nut types I've seen are:
1) A screw on arrangement and then a single set screw and jam nut to keep the handguard from rotating. 2) The barrel nut screws on and then the handguard slips on and uses 4 to 8 screws to hold it on. 3) The handguard appears to slip on and is held steady by a pinch bolt. 4) Some seem to have a bolt through the handguard and nut to pin it in place. 5) Some have a mixture of the above but also have tabs to keep the handguard from rotating. I would assume that all work, but wondering about ones where people have experienced problems with rotating, slipping, or bending under normal use. What about using a sling and attaching it down by the muzzle. Any known problems with a particular type there? What about a bi-pod mounted on the rail. Any issues? There are other threads about cheaply made handguards, and I really appreciate the information about keymod specifications and how some manufacturers aren't following them. My use will be general range type of stuff, possibly an Appleseed event, possibly shooting sage rats (hence the bi-pod question), and possibly some 3 gun type of activities. I threw out my back so won't be able to do any operator or mall ninja stuff, just shoot zombies! 
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| I've used the first 2 you've mentioned. The first is my favorite. It's super easy to align with the receiver hole and it holds the rail on just fine. I've got it on my competition AR right now and I've never had an issue with it. The second I've seen more with keymod rails and the like. Still a good solid system, but it's a pain to install. It's a lot harder to time the screw holes and get a good receiver/handguard mate. Often times you'll tighten it, slide the rail on, tighten down a few screws and realize the top rail is off by about 2 degrees. Tighten it a bit more and you're 2 degrees off the other way. Just a pain in the ass. |
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My old DD M4 rails used pins to locate the handguard and a jambnut/lockring to secure it. Those suckers never came loose. If your gas tube slipped through the barrel nut and receiver, you were pretty much guaranteed the rail was timed correctly.
I've got a 15" Geissele MK4 on one of my rifles. I was curious as to how the mounting system would work, but after install I know it's not gonna move. The rail is a very tight fit around the barrel nut, PLUS two bolts tightened perpendicular for clamping, and then two grub screws to prevent rotation (I think they're just there for peace of mind). All I'd ever used were daniel defense until I bought the Mk4. I can say that both mounting systems are rock solid. |
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Quoted:
My solution is to just buy an Aero M4E1 upper and attach a compatible handguard. I can certainly go with an Aero unit, just won't have the enhanced upper. But since I have options, want to do the best I can without spending more than necessary. Since the Aero 15" M-Loc handguards are out of stock right now, looking around and actually getting more confused. |
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Quoted:
I was going to do that. Then I mentioned it to a guy at the counter of a local gun shop and he showed me a hand guard that they only wanted $60 for. Thinking it was a great deal, I bought it and then got an Aero standard upper. Wasn't until I read the thread here about some Chicom units not meeting keymod specs that I realized this one was a cheap knockoff and didn't have the keymod milling on the inside. Now I have a standard Aero upper and looking for a decent handguard. Basically, have been burned and don't want to make the same mistake again. I can certainly go with an Aero unit, just won't have the enhanced upper. But since I have options, want to do the best I can without spending more than necessary. Since the Aero 15" M-Loc handguards are out of stock right now, looking around and actually getting more confused. Quoted:
Quoted:
My solution is to just buy an Aero M4E1 upper and attach a compatible handguard. I can certainly go with an Aero unit, just won't have the enhanced upper. But since I have options, want to do the best I can without spending more than necessary. Since the Aero 15" M-Loc handguards are out of stock right now, looking around and actually getting more confused. There's a happy medium, but you won't buy a quality aluminum handguard for $50 new. Quality, budget-friendly foreends I'm familiar with are: ALG Midwest Industries Yankee Hill Machine Nordic Components Samson Troy |
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I like #2 I have #2. My Guntec M-Lok rail: 
Some people are skeptical of this because there is nothing to keep the barrel nut from backing off, but if you're over the minimum torque spec, you're fine. Rock River Arms uses a similar method with aluminum barrel nuts too, but their rails screw on to the barre nuts. |
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Quoted:
I understand that you're not going to get the best at an economy price. My question was about being able to tell what characteristics were good or bad. In this case, the barrel nut and attachment arrangement and it's affect on performance. My point is that decent manufacturers use/have used all of the methods you listed. Buy a good quality rail with a barrel nut and locking system that is machined correctly and you won't have an issue. In the event you had an issue, any of the companies I listed will stand by their product. |
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Sounds like it's more the manufacturing quality and brand than the actual method that determines how good the barrel nut and hand guard combination works.
Was able to find a great deal on an Aero combo set from Granite Mountain. The enhanced upper has the hand guard mount built in so there are absolutely no issues with alignment or slipping. With a snug fit and then 8 screws to hold it in place, should be exceptionally sturdy.The gas tube fits into the receiver above the barrel nut so no alignment issues there either. Aero will take the old receiver back and the LGS will let me return the cheap hand guard for store credit. Small price to pay for catching my errors early. |
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