16" rifle length uppers

[yallknowho]

I've been seeing some pics of these lately and they interest me. Are these custom cut to size, or are they in production?

[Stickman]

I've been seeing some pics of these lately and they interest me. Are these custom cut to size, or are they in production?



Do you mean like the below BCM weapon, or do you mean a 16" with rifle FSB?




http://stickman.rainierarms.com/galleries/BCM/STCK0612-1024-Stick.jpg

[shittercrewchief]

Are you talking about a 16" barrel with a mid length gas system and rifle front sight base.

[yallknowho]

I think what I've been seeing is a 16" barrel with rifle length gas system. At least the FSB was rifle length.

[yallknowho]

https://www.m4carbine.net/showthread.php?t=47807

I guess they aren't reliable.

[Stickman]

I think what I've been seeing is a 16" barrel with rifle length gas system. At least the FSB was rifle length.


The FSB being out that far, and it being actually a rifle gas system are two different things. I've got some pictures of a project that can't be shown at this point, so I'll have to play tease for right now (sorry).

The midlength seems to be the best all around player, and a rifle length rail puts the sights out where they work best.

[yallknowho]

http://adcofirearms.com/itemdetails_.cfm?inventorynumber=2762

Adco has one. It probably wont come out lighter than a 16" with a 12" rail though.

[thopkins22]

I imagine that you've seen a 16" version of this.
http://www.bravocompanyusa.com/BCM-12-5-Upper-Receiver-Group-p/bcm-urg-m4-12%20kd.htm

Where the actual gas system is mid-length hidden underneath a rail with fixed front sight at rifle length.

I like mid-length gas, fixed front sights, long rails/handguards, and a longer sight radius is always great. But at what point does it just get excessive?

[lindertw]

Defensive Edge/SLR15 commander (http://www.slr15.com/slr15commanderrifle.html) has rifle length sight radius (not sure what length gas system). I recall you used to be able to get just the upper from Sully; guess you can give them a call.

[Skyyr]

Defensive Edge/SLR15 commander (http://www.slr15.com/slr15commanderrifle.html). I recall you used to be able to get just the upper from Sully; guess you can give them a call.

Off-topic, but wow. They have this written on that page:

"The covered barrel is a plus, because if the raw barrel is touched to anything like a barricade/cover during the firing process, the harmonic vibrations of the barrel will be interupted, and the shot will not go where the shooter intends. A covered barrel does not get interrupted during the shot."

So I guess the non-free-floated handguard that the barrel is touching doesn't qualify as actually "touching." :rolleyes:

[BrigandTwoFour]

Off-topic, but wow. They have this written on that page:

"The covered barrel is a plus, because if the raw barrel is touched to anything like a barricade/cover during the firing process, the harmonic vibrations of the barrel will be interupted, and the shot will not go where the shooter intends. A covered barrel does not get interrupted during the shot."

So I guess the non-free-floated handguard that the barrel is touching doesn't qualify as actually "touching." :rolleyes:

I may be wrong, but....

If the barrel is already touching the non-free float, then the harmonics would be different during zeroing anyway, thus the altered harmonics become the zero. If you were to remove the non-free float and put a FF tube on there so that the barrel was touching nothing, I imagine you would have the opposite effect and your zero would be off from when it had the non FF tube.

Edit: At least, that's what my non-engineer but still pretty tech savy mind things. I'll stop deviating from topic now.

[Skyyr]

I may be wrong, but....

If the barrel is already touching the non-free float, then the harmonics would be different during zeroing anyway, thus the altered harmonics become the zero. If you were to remove the non-free float and put a FF tube on there so that the barrel was touching nothing, I imagine you would have the opposite effect and your zero would be off from when it had the non FF tube.

Edit: At least, that's what my non-engineer but still pretty tech savy mind things. I'll stop deviating from topic now.

Because the barrel is non-free-floated, it will change harmonics every time the handguards are gripped because of the force imposed on the barrel and because there's no way to ensure a 100% repeatable grip (so the forces vary each time you grip it). A reputed member of TOS did some testing and it was found that groups tightened, on average, .5" @ 100yds using a free-float vs a non-free-float.

Their point is that covering the barrel with standard rifle-length handgaurds protects the harmonics from changing. On the contrary, the handguard will cause the average accuracy to decrease.

In short, it's a load of marketing BS.