O ring on threaded M&P15 sport 2 barrel?
- Thread starter n8vmind
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Luger9x19
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- Jan 27, 2018
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Luger9x19
Member
- Joined
- Jan 27, 2018
- Messages
- 142
- Reaction score
- 140
Just make sure you are using a new crush washer to ensure you get a good lock when timing the muzzle brake.
Rastoff
US Veteran
Are rubber o-rings common? I've never seen one before on an AR muzzle device. Wouldn't it melt?
Never seen one on any kind of AR and yes they would melt. But honestly I think the OP was referring to the crush washer and just didn't know the right term.
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cyphertext
US Veteran
Nope... if you go back and look, he said "Thanks..my muzzle brake has a crush washer. So I'll remove the o ring"... clearly he is looking at 2 different things.
Yes..i was referring to 2 separate things. My aftermarket muzzle brake has a crush washer. M&P15 Sport 2 Optic ready comes from the factory with a thread protector with preinstalled Oring on the threaded barrel. I had fired 200rounds in factory config (no muzzle brake installed, factory O ring and thread protector in place)... O ring is still intact and hadn't melted.
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cyphertext
US Veteran
Are you in California by any chance? Most of these rifles do not come from the factory with a thread protector, but the CA compliant ones do. Most come with an A2 style flash hider from the factory.
cyphertext
US Veteran
At least the barrel is threaded!
Westie1
Member
Interesting that the compliant OR version has a threaded barrel while the standard Sport II doesn't. And the OR lists for $20 less.Haven't seen the OR, but really haven't been looking.
JRD
Member
The o-ring is to keep the thread protector from vibrating off during firing.
Factory flash hiders use a crush washer.
Ditch the o-ring and go with a crush washer if installing a flash hider or muzzle brake.
Factory flash hiders use a crush washer.
Ditch the o-ring and go with a crush washer if installing a flash hider or muzzle brake.
Another idea is a soft aluminum or copper oil drain plug washer. You can get those most any auto parts store, or decent hardware store.
Standard threading on that barrel is 1/2x28, so a 1/2" drain plug washer should be perfect.
For the record, I have a Ruger 10/22 bull barrel that is factory threaded, and the thread protector is counter-bored for an O-ring. The seam is almost imperceptible when the protector is on. Doubt you could get the muzzle end hot enough on a .22LR Bull barrel to ruin the O-ring, unless it is a full auto 10/22 or something similar.
Standard threading on that barrel is 1/2x28, so a 1/2" drain plug washer should be perfect.
For the record, I have a Ruger 10/22 bull barrel that is factory threaded, and the thread protector is counter-bored for an O-ring. The seam is almost imperceptible when the protector is on. Doubt you could get the muzzle end hot enough on a .22LR Bull barrel to ruin the O-ring, unless it is a full auto 10/22 or something similar.
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