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Custom 556xi Extended Handguard

This is a discussion on Custom 556xi Extended Handguard within the SIG Sauer Rifles forums, part of the SIG Sauer Forum category; Hey guys, first post here so first of all Hi! I am a hobbyist designer of firearms parts/accessorizes and my brother just recently picked up ...


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Old 11-30-2016, 09:41 AM   #1
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Custom 556xi Extended Handguard

Hey guys, first post here so first of all Hi! I am a hobbyist designer of firearms parts/accessorizes and my brother just recently picked up a 556xi. He asked if I could design a handguard for him so I did. He still hasn't shot it yet and who knows when he will so I was hoping to get some feedback elsewhere.

What do you guys think of the design/functionality?

It slides on/off and attaches with the factory pin so gas adjustment is easy if you just slide the handguard foreword a tad, make your adjustments than slide it back. I'd make an extended adjustment knob but I dont think he'll ever use it.

Anyway.. lemme know what you think. I've attached some photos showing the process from my photoshop concept - laser scanning & measurements - 3d model - test fitted nylon sls 3d print with aluminum rails - dyed and painted part.
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File Type: jpg SIG03.jpg (129.2 KB, 30 views)
File Type: jpg SigHG04.jpg (84.6 KB, 30 views)
File Type: jpg SigHG05.jpg (74.5 KB, 27 views)
File Type: jpg SigHG06.jpg (474.2 KB, 28 views)
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Old 11-30-2016, 10:28 AM   #2
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Welcome to Sig Talk!! Looks like a well made handguard - Thanks for your pics. My preference has moved away from quad-rail handguards to reduce weight, and more grip friendly designs. MCX and Lancer carbon on SIG516 are my latest squeeze...

Cheers
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Old 11-30-2016, 11:29 AM   #3
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Originally Posted by kansascity45 View Post
Welcome to Sig Talk!! Looks like a well made handguard - Thanks for your pics. My preference has moved away from quad-rail handguards to reduce weight, and more grip friendly designs. MCX and Lancer carbon on SIG516 are my latest squeeze...

Cheers
Because of the way I made it the side and bottom rails can be completely removed leaving a smooth surface for a tighter more comfortable grip. I think for his tho I may just do away with the 12" aluminum side rails altogether and replace them with 2.5" magpul polymer rails located towords the front. Like pictured here.
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Old 12-02-2016, 02:23 AM   #4
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I would love one!.. Wold it fit an SBR (pistol length) up to the muzzle device? If So I Really want one..
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Old 12-02-2016, 06:02 AM   #5
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I would love one!.. Wold it fit an SBR (pistol length) up to the muzzle device? If So I Really want one..
Not sure without having some measurements. Best I can do is tell you this measures in at just over 12" in total length not counting the mounting pin hole piece
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Old 12-10-2016, 12:41 PM   #6
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How well does it hold up to the heat of the barrel and how strong is it. Also how much are you asking for a completed piece? Looks good. The original handguard, was it the keymod piece and if so is he willing to part with it?
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Old 12-10-2016, 01:10 PM   #7
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My suggestion is like what kansascity45 said the quad rails is a lot of work on machining. KeyMod is good but requires the same amount of work. Ditch the quad rails on the 3,6,9 o'clock positions.

So Far the easiest mount system to integrate into a rail is MLOK, being custom made and it saves on overall weight and machine work. Your use of the OEM pin rail retention is great and simple.

The heat question is always brought up. Around the gas block should either be spaced/gap like the lancer CF rail offered for the 516 or you "beef" up that section close to the gas block. Main point is that the heat transfer will be quick and high temps to follow

Overall I like the approach you made to making a 556xi custom handguard. I am an engineer also, but I never have free time for custom projects I just send my rifles off. If you do decide to sell a rail lmk I would be interested.
Keep up the good work.
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Old 12-16-2016, 11:45 AM   #8
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Originally Posted by Chrishemi226 View Post
How well does it hold up to the heat of the barrel and how strong is it. Also how much are you asking for a completed piece? Looks good. The original handguard, was it the keymod piece and if so is he willing to part with it?
Its strong for what it is. It's got a little flex to it so if I were to make another one I might make it a tad thicker to stiffen it up a bit. Based on past experience barrel heat is a non issue with this material. Just don't try to paint it and bake it in an oven. I think his original grip was mlok
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Old 01-07-2017, 10:50 AM   #9
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Hey guys, my brother had me go a completely different direction with a new design for his rifle. Is anyone interested in this one? I will sell this one and this one only, won't be making others. Message me.
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Old 01-07-2017, 12:20 PM   #10
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Hey guys, my brother had me go a completely different direction with a new design for his rifle. Is anyone interested in this one? I will sell this one and this one only, won't be making others. Message me.
PM sent
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