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Rattler Handguard after Barrel Conversion (.300 to 5.56)

This is a discussion on Rattler Handguard after Barrel Conversion (.300 to 5.56) within the SIG Sauer Rifles forums, part of the SIG Sauer Forum category; Hey gang, long time listener first time caller. I'm the proud owner of a new Rattler. Not much done to it as of yet; Inforce ...


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Old 05-16-2020, 07:12 PM   #1
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Question Rattler Handguard after Barrel Conversion (.300 to 5.56)

Hey gang, long time listener first time caller.

I'm the proud owner of a new Rattler. Not much done to it as of yet; Inforce WML on the front and a whole bunch of things in the mail (collapsing SBR stock, Romeo 4T, reduced angle MCX grip, Tread vertical grip, SRD762). The one part that HAS come in from Sig is the 5.56 barrel that I wanted to have for cheap plinking while the SRD762 is in jail.

I purchased the barrel only, fully aware of the warning on the product page:

It will not function with a factory .300BLK handguard. This barrel requires the 5.56NATO Rattler handguard.


Figured I'd fit it and see what issues presented themselves. So here we are, installed and with the .300 handguard back on. And honestly, I can't see any problems. Sure there's some overhang and a hand-slip risk, but that'll resolve itself once the pistol grip arrives (and associated tax stamp, of course, because what's another $200 at this point).

So, for those more knowledgeable and experienced than me, what am I missing that will impede the weapon's function??? That's a big scary word when talking about caliber conversions, so I'd like to be safe rather than sorry.

Thanks in advance for the thoughts, and looking forward to tolling less and chatting more in the future.
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Last edited by über; 05-22-2020 at 07:38 PM.
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Old 05-17-2020, 04:19 PM   #2
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Hmm.have rattler in 55.6..not sure Re handguard..gl with build..lmk if selling the grip👍
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Old 05-21-2020, 08:07 PM   #3
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Quote:
Originally Posted by Rexorcist View Post
Hmm.have rattler in 55.6..not sure Re handguard..gl with build..lmk if selling the grip👍
Thanks Rex. Surprised there's not more traffic on the thread. Maybe a $2500 rifle plus a $600 barrel conversion is a bit rich for most (thank god for APP), but I personally like the idea of a multi-caliber SBR over having to build and stamp twice
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Old 05-21-2020, 08:29 PM   #4
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Congrats on your Rattler!! Yeah agree, multi-caliber & alternative set ups are what MCX's all about.

My 10" 5.56 SBR is a flame thrower when unsuppressed, really lights up an indoor range. You can expect an enormous muzzle flash & concussion blast with that 5.5" 5.56 barrel - Suggest installing a robust blast deflector to make your plinking alot more enjoyable. Also, bring along a fire extinguisher for the inevitable grass fires...


Cheers
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Old 05-22-2020, 12:05 PM   #5
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Finally had the time to call SIG on the topic. Confirmed that they “strongly recommend the longer hand guard for safety reasons,” citing the exposed barrel specifically, but that there should be no impediment to FUNCTION (again, a big scary word when talking about caliber conversions). Happy to hear it — this means a Midwest Industries handguard, which is about 0.5” longer than the 300 and 0.5” shorter than the 5.56, could cover down on both requirements rather than having to tote two guards all the time. Woot!
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Old 05-23-2020, 03:50 PM   #6
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Rattler Handguard after Barrel Conversion (.300 to 5.56)

As much for my own validation/edification as the group's, here's a quick mockup of the difference at hand.

• Top: .300 handguard & barrel
• Middle: .300 handguard, 5.56 barrel (my current config)
• Bottom: 5.56 handguard & barrel

There are benefits to the 5.56 handguard including 3 additional picatinny studs, but the Midwest Industries 5.25" MLOK handguard has +2 over the .300 stock guard, offers some interesting ergonomic benefits, and a heck of a lot more MLOK space while still providing access to the .300 gas block and some additional length. Definitely where my head is at at the moment.
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Old 05-23-2020, 04:17 PM   #7
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My 556 is a very fun flamethrower...can not attach a blast device/can to 556..pinned and welded “ flashhider”..do enjoy��
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Old 05-23-2020, 11:15 PM   #8
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Rattler Handguard after Barrel Conversion (.300 to 5.56)

Quote:
Originally Posted by Rexorcist View Post
My 556 is a very fun flamethrower...can not attach a blast device/can to 556..pinned and welded “ flashhider”..do enjoy��

I wonder if there’s a faux suppressor approach that can be taken with the 5.56? I think guys are doing something similar already with their MCX Crankebrake conversions? Wouldn’t do anything about sound, but could capture and quell some of that muzzle blast for sure (or at least move it away a bit). Seems to be plenty of over-device options out there that might still work with the pinned 5.56 barrel.

Last edited by über; 05-23-2020 at 11:28 PM.
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