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View Full Version : Who makes BCM's uppers/barrels?


a1fabweld
10-28-2008, 10:25 AM
Is it LMT? Just curious. Thanks.

a1fabweld
10-28-2008, 3:08 PM
Is it top secret or nobody knows?

aplinker
10-28-2008, 3:28 PM
It's a trade secret. They don't say who's doing it. They will only talk about the processes/specs of their products:

M4 Feed Ramp Barrel Extension
M4 Feed Ramp Flat Top Receiver
In developing the USGI M4 carbine as one of the primary weapons for today’s infantry, some modifications were performed to the original M16 platform to enhance the reliability of the shorter barreled carbines. With the shorter carbine gas system and the increased gas port pressure, the carbine cycled faster, and at times the cycle rate could be faster than the magazine would feed ammunition. One of the modifications done to increase reliable feeding included enhancing the angle and the length of the feed ramps. This USGI modification was done to both the barrel extension and the upper receiver, creating a longer and steeper feed ramp. These Mil-Spec M4 feed ramps are part of the original CNC manufacturing process. As a result, the factory machined M4 feed ramps on the receiver are hard coat anodized which adds significant strength to the aluminum. This feature is offered on all BCM uppers and all BCM barrels.

T-Marked Upper Receiver
The contemporary M16/M4 rifle is built around the concept of modularity. All of the BCM flat top uppers feature a USGI type laser etched T-marks to provide addressing for the remounting of tactical accessories such as optics, laser sights, etc. This enables the weapon platform to be easily configured and then accurately reconfigured for each specific mission.

USGI 1/7 Twist Rate
The USGI 1/7 twist rate of all of the BCM barrels is the preferred twist rate by most professional infantryman. This twist rate has proven very versatile and can effectively run the new heavier 5.56 ammo that is hugely popular with military and private security personal for its’ superior ballistics.

Mil-Spec Barrel Steel (Mil-B-11595E)
BCM barrel steel is Mil-Spec per MIL-B-11595E. The 4150 grade (CMV) of steel is a Mil-Spec steel used in the USGI M16 family of rifles; it is stronger and will last longer than the typical barrels offered in the commercial market. The Mil-Spec grade 4150 gets its’ additional strength and rigidity from an increase in carbon and/or vanadium in the alloy. This will offer increased barrel life and performance through use in all types of extreme environments and temperatures.

Chrome Bore and Chamber
One of the first modifications that were made to the original M16 in the mid 1960’s was the addition of the chrome lined bore and chamber. It is now a world wide standard in the industry for a battle rifle. The chrome bore and chamber is harder than the barrel steel and on the USGI M16/M4 rifles will aid in chambering, extraction, and reliability. It increases velocity, and also resist against fouling and corrosion from extended use in the field. This gives the end user a longer barrel life with less required time in maintenance and cleaning.

Manganese Phosphate Barrel Finish
Barrels are parkerized with the manganese phosphate finish (Mil-Spec A-A-59267). Military specifications also state that the entire barrel surface is phosphate finished to create a porous surface to absorb oil as to resist against corrosion from the elements. BCM barrels are phosphated before installation of front sights. This is a much more extensive assembly operation, but insures that the entire barrel is finished and protected . . .even under the front sight base.

5.56 NATO Chambers
The USGI 5.56 NATO chamber is the best choice for effective deployment, reliability, and compatibility, of higher chamber pressures of military ammo.

Mil-Spec F-Marked Forged Front Sight Bases
Mil-Spec for rifles issued to the troops require taller front sight bases on all flat top AR rifles. Many commercial offerings use M16A2 height front sight bases on all of their barrels regardless of what type of upper it is installed on. As a result, owners of rifles and carbines with the flat top receiver configuration can have problems getting a proper 'zero' for elevation with Mil-Spec back up iron sights. As all of the BCM uppers are built for flat top uppers, all have the proper Mil-Spec F marked front sight base to insure the correct height for iron sight zeroing when using military iron sights. Mil-Spec taper pins secure the forged front sight base with the sling swivel secured by tubular rivets.

Government Barrel Profiles
Duty rifles are built to be carried - day in and day out. The USGI barrel profiles (often referred to as the Government Profile) enable the operator to carry their weapon for longer periods of time and deploy them faster than the heavier commercial H-Barrel counterparts. The government profile barrel is also compatible with the current M203 mounting systems.

HPT / MP Inspected Barrels
Military specifications require that barrels undergo a HPT (High-Pressure Test) load as a part of quality assurance procedures. Commonly referred to as a proof load, the M197 HPT is rated for 70,000 psi. BCM barrels are proof loaded and then MPI (Magnetic Particle Inspected) to detect any possible flaws in the barrels surface. The barrels are MP inspected with both circular and longitudinal magnetic fields per ASTME1444-01 (current Mil-Spec) to assure a high quality finished product. All BCM barrels are marked HP MP as our proof load marking.

Copyright 2005-2008 Bravo Company MFG, Inc.




Features

* M4 Feed Ramp Barrel Extension (USGI)

* M4 Feed Ramp Flat Top Receiver

* T-Marked Upper Receivers

* USGI 1/7 Twist Rates

* USGI 5.56 NATO Chambers

* Mil-Spec 11595E - Barrel Steel (CMV)

* Chrome Lined Bore and Chamber

* Manganese Phosphate Barrel Finish

* Mil-Spec F-Marked Forged Front Sights

* USGI Government Profile Barrels

* HPT (High Pressure Test) Barrels

* MPI (Magnetic Particle Inspected) Barrels

odysseus
10-28-2008, 3:31 PM
Who's a good dealer people have had good experiences with on these?

.

NiteQwill
10-28-2008, 4:19 PM
BCM is probably one of the best out there.

I buy their stuff directly off their site.

elSquid
10-28-2008, 5:00 PM
It's a trade secret. They don't say who's doing it. They will only talk about the processes/specs of their products:

Is there any independent testing/verification of BCM claims?

-- Michael

Trendkill
10-28-2008, 6:12 PM
All I know is once again....as soon as I am ready to buy my BCM upper there are none to be found. DAMN IT !!!!

aplinker
10-28-2008, 6:21 PM
Is there any independent testing/verification of BCM claims?

-- Michael

Everything except the HPT/MPI is easy to see.

It's not like BCM's stuff is new or untested. It's just new to CG.

http://www.m4carbine.net/showthread.php?t=63

take note of post #4... a pretty telling endorsement.

elSquid
10-28-2008, 7:35 PM
Everything except the HPT/MPI is easy to see.

It's not like BCM's stuff is new or untested. It's just new to CG.

http://www.m4carbine.net/showthread.php?t=63

take note of post #4... a pretty telling endorsement.

Yeah, that's not bad. :)

-- Michael

Trendkill
10-28-2008, 7:37 PM
I think a better question is...."Who has any BCM uppers at all???"

J_Rock
10-28-2008, 7:43 PM
We have 5300+ rds through it right now, and will give it a quick cleaning shortly.
One magazine related malfunction, and that was all.
BCM makes great stuff.


Another endorsement that matters


http://www.ar15.com/forums/topic.html?b=3&f=118&t=360169&page=26

ChrisXD45T
10-28-2008, 8:12 PM
I think a better question is...."Who has any BCM uppers at all???"
Along with BCM you could check these two everyday for months like I did before I got mine.
http://www.gandrtactical.com/cgi-bin/commerce.cgi?preadd=action&key=UPR-BCM
http://02b5218.netsolstores.com/search.aspx?manufacturer=5

Sleepnosis
10-28-2008, 8:35 PM
wow they sold out quick! I guess I picked mine up at the right time.

dilligaffrn
10-28-2008, 8:57 PM
http://02b5218.netsolstores.com/bravocomfg16inchgovtprofilem4upper.aspx

in stock

it is where i got mine (LOVE IT!)

Sleepnosis
10-28-2008, 9:42 PM
I meant middies...whoops!

aplinker
10-29-2008, 12:32 AM
yes, careful... those are carbines ;)

shark92651
10-30-2008, 12:57 AM
I think a better question is...."Who has any BCM uppers at all???"

Can't you just place an order on their website and when they have them in stock they will ship one to you? I would imagine BCM gets them "in stock" before any of their resellers do. Or do they not allow backorders?

odysseus
10-30-2008, 2:07 AM
Can't you just place an order on their website and when they have them in stock they will ship one to you? I would imagine BCM gets them "in stock" before any of their resellers do. Or do they not allow backorders?

Doesn't seem they allow backorders.

.

shark92651
10-30-2008, 9:56 AM
Doesn't seem they allow backorders.

.

Sounds like a good way to lose sales...

asymmetricalwarfar3
10-30-2008, 12:08 PM
I don't think they have a problem selling those.....:rolleyes:

shark92651
10-30-2008, 12:46 PM
True, but if customer wants product X and they won't let him stand in line then me may buy product Y. I don't understand why a company would not accept backorders when Demand > Supply.