XM177: 5.5" moderator straight wall or conical?

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Originally Posted by SteyrAUG

All that. Which is why you don't see XM177 type flash hiders on current 10.3/11.5 SBRs unless you are building a clone. For the same space you could mount a SF mini and get actual suppression.

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Problem is I'm building a clone

Options:

1) By a wide margin. Find an over the barrel version you can get pinned to a 14.5” barrel.

2) Ask the manufacturer why they make two different designs and what they recommend for your needs.

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Originally Posted by Stopsign32v

Maybe I should buy both and do a comparison at the range before pinning and welding. I'm mostly concerned with accuracy. I'll just get both and make a thread on my findings.

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Better do the testing on a pistol pistol lower...

Todd's number 1 by a wide margin. There are nuances of course but I predict big flash and the thing is, the flash makes its own noise. So, if possible, don't give up velocity and replace it with more flash, more noise, and less reliability. Unless you want to also replicate ballistics for research purposes. but-- we've had old Olympic guns in class that had the long FH and they basically give the worst of all worlds.

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Originally Posted by Ned Christiansen

Todd's number 1 by a wide margin. There are nuances of course but I predict big flash and the thing is, the flash makes its own noise. So, if possible, don't give up velocity and replace it with more flash, more noise, and less reliability. Unless you want to also replicate ballistics for research purposes. but-- we've had old Olympic guns in class that had the long FH and they basically give the worst of all worlds.

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Which one are you talking about? And who is Todd?

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Originally Posted by Todd.K

1) By a wide margin. Find an over the barrel version you can get pinned to a 14.5” barrel.

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This number 1

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Originally Posted by Todd.K

This number 1

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Again cloning it. I don't care much about flash or noise it will be a range toy. I am nervous about horrible accuracy though with a 5.5" FH

With that #1 option it will look the same but give you another 150-200 FPS which some day you may be glad you had, plus your accuracy concerns are gone. There is a guy that specializes in the clone thang, bet he has the preferred combo whichever you choose, but I can't think of his company name just now. Charlie's Clones maybe?

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Originally Posted by Stopsign32v

Problem is I'm building a clone

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Ah, in that case I'd go with the Griffin that sinister recommended.

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Originally Posted by SteyrAUG

Ah, in that case I'd go with the Griffin that sinister recommended.

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They aren't made anymore

https://nfatalk.org/forum/showthread.php?t=12761