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Discussion Starter · #1 ·
I've heard a lot of complaints about muzzle blast from 5.56 SBRs -- presumably because the standard loads are designed for longer burns in the longer mil-spec barrels. I've also heard anecdotally that 6.8mm doesn't have this problem as much. Can anyone with SBRs in both calibers confirm whether 6.8 is a relativley more subdued round from the shorter barrels?
 

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6.8 SPC has much more blast than 5.56, in both 16" and SBR. My 11" 6.8 SPC almost feels like it is burning the hairs on my arms when I shoot it. It is very manageable but you definitely know you are shooting something bigger than 5.56. The PWS muzzle break really helps out lots. I know people don't like to stand to my side when I shoot it. I also have a 5.56 barrel in 11".
 

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Discussion Starter · #3 ·
Huh, well that doesn't seem like a good feature to have -- especially since SBRs are designed for confined spaces!

Are there faster-burning loads in either caliber that reduce muzzle blast, or do other rifle calibers work better in SBRs?
 

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I didn't say it doesn't work well. Have you ever fired an 11 inch 5.56? It has a bit of muzzle blast, hence the reason more LE/MIL are going to Supressors for CQB. I am not sure it is a component of powder burn as much as it is just that the muzzle is that much closer to you. Maybe I don;t know enough about the burn time and effect on muzzle blast. When I think of muzzle blast I think of the blast of air that I feel when I shoot, not a flame coming out of th eend. Like I said, the PWS muzzle brake makes it very comfortable.

Me, I wouldn't want to do any CQB stuff with an SBR on a daily basis unless it was supressed. Good thing my job description doesn't call for any of that. If I have to use it once or twice I will be just fine.
 

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I've heard a lot of complaints about muzzle blast from 5.56 SBRs -- presumably because the standard loads are designed for longer burns in the longer mil-spec barrels. I've also heard anecdotally that 6.8mm doesn't have this problem as much. Can anyone with SBRs in both calibers confirm whether 6.8 is a relativley more subdued round from the shorter barrels?
I have two LWRC gas piston ARs....with 10.5" bbls on each. I can say without a doubt the 6.8 has WAY more muzzle blast (as in a giant, visible fireball in bright sunlight) and much more recoil than even my POF P-308 (which is admittedly very low).

I actually had a guy ask if I was shooting a .50 cal when I lit off a mag of 6.8, LOL. It's THAT loud and has that much percussion.


While this doesn't pertain to the XCR, it may be of some use to you.
HTH,
Sean
 

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Recoil is pretty low on my 11" 6.8 and with the PWS flash hider/brake there is little to no flash when shooting, at least during the day.
 
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