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516 handguard weight

This is a discussion on 516 handguard weight within the SIG Sauer Rifles forums, part of the SIG Sauer Forum category; I have been looking around and can't seem to find the info I need. I have a 10" 516 with the factory quad rail. Looking ...


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Old 06-29-2020, 08:42 PM   #1
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516 handguard weight

I have been looking around and can't seem to find the info I need.
I have a 10" 516 with the factory quad rail. Looking to lose some weight. My SBR weighs in at 10 lbs 4 oz loaded, sling, red dot, and with the Turbo mounted.
Does anybody have the weight of the carbine quad rail? Looking to swap to the Lancer and want to verify it's worth change over.
Thanks!
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Old 06-30-2020, 01:28 AM   #2
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I think one person here knows it...
I wish that Sig would have made different versions available...
I know it would not be cheap, but a machine shop could lighten it, I am sure.
I am curious what the different mountings look like from Sig and all other AR15 rail mounts.
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Old 06-30-2020, 02:28 AM   #3
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This may help. The shorter version of the Sig quad rail weighs 9.5 ounces. The longer version weighs 11.3 ounces. There is not much difference in weight between the longer Sig quad rail and the 13" Lancer carbon fiber rail (I have two of them). The difference in feel is remarkable, however.
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Old 06-30-2020, 03:36 AM   #4
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I did exactly what Steve40th mentioned and milled the Samson quad rail on my 556 and it made a huge difference. I didnít measure it before but it feels about half the weight it started. I basically changed it from a quad rail to m-lok. If you could find a machinist locally that could do the same I think youíd be happy with the results.
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Old 06-30-2020, 05:38 AM   #5
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Here are some photos of two of my 516s. Both are 14.5" barrels with pin and weld VG6 muzzle brakes. The top 516 has the factory quad rail and the bottom 516 has the 13" Lancer CF M-lok rail.
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Old 06-30-2020, 06:24 AM   #6
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516 handguard weight

Quote:
Originally Posted by kyjd75 View Post
This may help. The shorter version of the Sig quad rail weighs 9.5 ounces. The longer version weighs 11.3 ounces. There is not much difference in weight between the longer Sig quad rail and the 13" Lancer carbon fiber rail (I have two of them). The difference in feel is remarkable, however.

Thanks for the info.
According to lancer, their handguard weighs .9lbs. Iím really shocked that there isnt really any savings there, but itís heavier?
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Old 06-30-2020, 07:01 AM   #7
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Quote:
Originally Posted by czgunner View Post
Thanks for the info.
According to lancer, their handguard weighs .9lbs. Iím really shocked that there isnt really any savings there, but itís heavier?
No, that info is incorrect. According to their website, when you specifically select the length that you want, i.e. the shorter model for your 10" barrel, they show the weight as .49 lbs (about 8 ounces) or roughly 1.5 ounces lighter than the short version of the Sig handguard.

Weight 0.493 lbs
Dimensions 7.25 ◊ 2 ◊ 2.25 in

I have a 10" 516 myself, but I have kept the original Sig rail so far.
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Old 06-30-2020, 07:13 AM   #8
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Quote:
Originally Posted by kyjd75 View Post
No, that info is incorrect. According to their website, when you specifically select the length that you want, i.e. the shorter model for your 10" barrel, they show the weight as .49 lbs (about 8 ounces) or roughly 1.5 ounces lighter than the short version of the Sig handguard.

Weight 0.493 lbs
Dimensions 7.25 ◊ 2 ◊ 2.25 in

I have a 10" 516 myself, but I have kept the original Sig rail so far.

Thanks for the correction. Regardless, the cost just isnít justified for 1.5 ounces.
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Old 06-30-2020, 09:30 AM   #9
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Making a 516 lighter seems difficult.
The easiest way is to use a lower capacity magazine...
I had a MCX and weighed it and my 516. Virtually the same. But, the MCX felt lighter.
Must be a balance thing.
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Old 06-30-2020, 09:42 AM   #10
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Looks like having the barrel lightened may be the most effective way to shed weight.
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Old 06-30-2020, 09:55 AM   #11
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Quote:
Originally Posted by kyjd75 View Post
Here are some photos of two of my 516s. Both are 14.5" barrels with pin and weld VG6 muzzle brakes. The top 516 has the factory quad rail and the bottom 516 has the 13" Lancer CF M-lok rail.

For the extra hand space I've considered getting the 13" Lancer carbon... Then adding lightening cuts to the top front to allow for easier access to the gas valve...

It'd be really nice if someone designed a 516 handguard out of aluminum that looked a lot like an LWRC A5-IC handguard...

.
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Last edited by Lancer L5 AWM; 06-30-2020 at 09:59 AM.
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Old 06-30-2020, 09:56 AM   #12
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Quote:
Originally Posted by Twister View Post
I did exactly what Steve40th mentioned and milled the Samson quad rail on my 556 and it made a huge difference. I didnít measure it before but it feels about half the weight it started. I basically changed it from a quad rail to m-lok. If you could find a machinist locally that could do the same I think youíd be happy with the results.

Twist,
She looks great- and we don't appreciate you holding out on us!

.
.
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Old 06-30-2020, 10:21 AM   #13
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Sig did make a keymod hand guard. Here is mine. It mounts different too.
I dont have more pitctures here, as I am on travel. But search keymod rail Sig 516, and you will see full pics..
Attached Images
File Type: jpg Gas Block Pinned.jpg (3.06 MB, 6 views)
File Type: jpg Hand Guard mounting.jpg (7.53 MB, 6 views)
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Old 06-30-2020, 10:38 AM   #14
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I see someone had already posted a picture of what looked like a carbon fiber rail.

There are also several makers now marketing a skeleton rail. The quad rail does seem like a big chunk of metal. MLok is ok. And aero precision has released its new rail Atlas S-one. Here are some comparable specs/weights:

KeyMod Handguard Weights: 7" - 4.76 oz, 9" - 5.34 oz, 12" - 6.81 oz, 15" - 7.69 oz
M-LOK Handguard Weights: 7" - 4.86 oz, 9" - 5.47 oz, 12" - 7.00 oz, 15" - 7.95 oz
Other Mounting Hardware Weight: 4.72 oz
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Old 06-30-2020, 11:00 AM   #15
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Beware of going too light with handguards because the issue of inadequate torsional rigidity can come into play- there are a few threads across the internetz forums of factory superlight handguards twisting enough to cause problems.

Unfortunately it seems the only way to know if a handguard is too light is after you realize it's twisting.


ETA: this may only be applicable to full auto- I'll try to find the threads and post links...

.
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Last edited by Lancer L5 AWM; 06-30-2020 at 11:29 AM.
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