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BravoCompanyUSA
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Posted: 5/13/2009 8:33:34 AM EST
[Last Edit: 5/13/2009 8:36:08 AM EST by BravoCompanyUSA]
Q: Why BCM chose the 11.5" SBR over the 10.5"

I get this question a lot. It is a good one. When we spec our program we can build anything we would like, so we sat down and looked at the pros and cons.

First Statement: I know a good 10.5" SBR can run very well. I personally own a semi MK18 type and it runs great. No problems.

A: Dwell time.
Dwell time is the time that your gas operated weapon maintains pressure to continue the cycling of the weapon. It primarily exsists from the time the bullet passes the gas port in the barrel to the time the bullet exits the muzzle. When you pull the trigger and fire the weapon the movement of the bolt carrier group unlocks the bolt, extracts, and ejects the spent casing. Then it cocks the weapon, feeds, chambers the next round, and then locks again. One of the thing that can make SBRs finicky is the dwell time (or lack of).

The 11.5" carbine is approximately 4% longer weapon than its' 10.5" counterpart, but this extra inch gives the barrel a 40% increase in length for dwell time. IMHO, this is an excellent trade off. This additional dwell time (all other things being equal) will allow the carbine to be more forgiving to different ammo types, extremes in air temperature, weak or worn extractor springs, worn extractors, buffer weights, etc.

Last Statement: For those folks who have a 10.5" that works very well, I would reply; me too. (see first statement)

If I had to "go to war" with a AR15 Carbine, I would grab the BCM 11.5".
The BCM 11.5" Runs Like a Dream.

Hope this info helps,
Paul
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slanky
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Posted: 5/13/2009 8:41:22 AM EST
Thanks Paul - exactly the info I was looking for. Didn't realize 1" would be that much of an exponential difference But happy now that I went ahead and ordered one of the BCM 11.5's a few days ago I have an H-buffer on my current SBR anyway, but wanted to get a quality upper/barrel for it. Now I just have to wait for Monday to roll around
NRA Lifer, XD enthusiast and AR-aholic
Lancelot
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Posted: 5/14/2009 3:44:54 PM EST
Its approved at work, now I just need it approved on the spousal units approal list.
Join us at The Colorado AR-15 Shooters Site: www.co-ar15.com

Proud owner, of BCM #95.
UVvis
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Posted: 5/21/2009 9:36:39 AM EST
Photo by USMC03:


My 11.5" BCM upper and bcg has been running and running. Round count is at around 2,100 rounds since last cleaning. Total round count is around 2,200 rounds, using an H2 buffer. The upper shoots.
testudo
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Posted: 5/21/2009 11:23:41 PM EST
That is a beauty! Wish I got one of these instead of my LMT 10.5" from Bravo Co.
9divdoc
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Posted: 5/27/2009 3:26:50 PM EST
Originally Posted By testudo:
That is a beauty! Wish I got one of these instead of my LMT 10.5" from Bravo Co.


Yes you do...:)

They are nice...glad I sold my LMT ..ya never know when we will see these again
after this batch has flown the nest...
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ziarifleman
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Posted: 5/27/2009 3:32:05 PM EST
Is there enough clear barrel on these to mount an AAC SPR/M4?
"To have a right to do a thing is not at all the same as to be right in doing it."
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BravoCompanyUSA
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Posted: 5/27/2009 4:13:09 PM EST
Originally Posted By ziarifleman:
Is there enough clear barrel on these to mount an AAC SPR/M4?



How much clearance is needed ?

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ziarifleman
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Posted: 5/28/2009 1:25:14 PM EST
Originally Posted By BravoCompanyUSA:
Originally Posted By ziarifleman:
Is there enough clear barrel on these to mount an AAC SPR/M4?



How much clearance is needed ?



2.49"
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BravoCompanyUSA
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Posted: 5/28/2009 5:12:19 PM EST
2.49" measured from what point to what point ?
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ziarifleman
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Posted: 5/28/2009 6:20:09 PM EST
Originally Posted By BravoCompanyUSA:
2.49" measured from what point to what point ?


From the muzzle back. If there is anything that it gets into within 2.49" of the muzzle, then it won't work.
I think the bayonet lug might be in the way, more than anything.
"To have a right to do a thing is not at all the same as to be right in doing it."
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kap_x
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Posted: 5/28/2009 6:30:36 PM EST
Fuckin' A. You're going to be taking more of my money, aren't you
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BravoCompanyUSA
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Posted: 5/30/2009 1:55:50 PM EST
Originally Posted By ziarifleman:
Originally Posted By BravoCompanyUSA:
2.49" measured from what point to what point ?


From the muzzle back. If there is anything that it gets into within 2.49" of the muzzle, then it won't work.
I think the bayonet lug might be in the way, more than anything.


1-7/8" from bayo lug to end of threaded muzzle (with out flash hider installed).


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9divdoc
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Posted: 5/30/2009 10:32:58 PM EST
UPMC

Here's one of Uncle Paul's Misguided Children

The truth, is the truth.. even if no one believes it..
and a lie.. is a lie...even if everyone believes it
ziarifleman
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Posted: 5/31/2009 12:54:46 AM EST
Originally Posted By BravoCompanyUSA:
Originally Posted By ziarifleman:
Originally Posted By BravoCompanyUSA:
2.49" measured from what point to what point ?


From the muzzle back. If there is anything that it gets into within 2.49" of the muzzle, then it won't work.
I think the bayonet lug might be in the way, more than anything.


1-7/8" from bayo lug to end of threaded muzzle (with out flash hider installed).




Thank you, sir.
"To have a right to do a thing is not at all the same as to be right in doing it."
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gregw45
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Posted: 6/4/2009 3:56:35 PM EST
[Last Edit: 12/17/2012 6:29:10 AM EST by gregw45]
Woo! All I had to do was swap out the crush washer for a peel washer for suppressor reasons. She shoots like a dream!
"Stop, sir, I beseech you. I apologize for calling your wife a bloated warthog, and I bid you good day."
Brad519
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Posted: 6/6/2009 12:44:54 AM EST
Well I guess its time to spend more money. I have a LMT 10.5 that I bought from Bravo that rides beside me on patrol. Now i gotta buy a BCM lower and then do the wait period for the NFA stamp to match it to the 11.5 BCM upper. This black rifle thing is really addictive. I wish all mine were BCM's.
eric10mm
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Posted: 8/22/2009 6:14:04 PM EST
Are the muzzle threads concentric with the bore enough to use these BCM 11.5 bbls with suppressors?
“When the people fear their government, there is tyranny; when the government fears the people, there is liberty.” Thomas Jefferson

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Posted: 9/25/2009 3:48:10 PM EST
bump
eric10mm
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Posted: 9/26/2009 9:55:16 AM EST
Originally Posted By eric10mm:
Are the muzzle threads concentric with the bore enough to use these BCM 11.5 bbls with suppressors?


“When the people fear their government, there is tyranny; when the government fears the people, there is liberty.” Thomas Jefferson
BravoCompanyUSA
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Posted: 9/26/2009 10:04:17 AM EST
[Last Edit: 9/26/2009 10:29:33 AM EST by BravoCompanyUSA]
They will be within the GI print spec.

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eric10mm
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Posted: 9/26/2009 11:38:13 PM EST
Would you put your $1000 suppressor on one?
“When the people fear their government, there is tyranny; when the government fears the people, there is liberty.” Thomas Jefferson
BravoCompanyUSA
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Posted: 10/3/2009 11:32:34 AM EST
[Last Edit: 10/3/2009 11:32:48 AM EST by BravoCompanyUSA]
Originally Posted By eric10mm:
Would you put your $1000 suppressor on one?


Sorry Eric, I did not see this reply.


Yes. I have more times, on more barrels, with more supressors, than I can honest count.
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kennedyusmc
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Posted: 1/7/2010 10:00:42 AM EST
Nice post...
So what about the 11.5 middy?

Longer gas system for more gas expansion (less pressure and smoother operation), but less dwell

Which do you reccomend?
Carbine or Middy 11.5?
BravoCompanyUSA
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Posted: 1/7/2010 10:04:21 AM EST
Originally Posted By kennedyusmc:
Nice post...
So what about the 11.5 middy?

Longer gas system for more gas expansion (less pressure and smoother operation), but less dwell

Which do you reccomend?
Carbine or Middy 11.5?



Middy gas on a 11.5' would not be combat reliable. It also would not fit with a FSB.

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markm
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Posted: 1/7/2010 10:12:43 AM EST
[Last Edit: 1/7/2010 10:13:26 AM EST by markm]
Originally Posted By BravoCompanyUSA:
Middy gas on a 11.5' would not be combat reliable. It also would not fit with a FSB.


How about rifle gas system?

This should be tacked with the SBR FAQ.
We need to get over the romance of carrying a 1911 pistol, and get on to the business of shooting smelly bad guys in the face with a modern handgun.
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