Pic Request: M4 CQBR

[One?]

Just like the title says, I'm looking for pictures of the M4 CQBR, or any M4 "setup" that is mostly used by contractors in a-stan or Iraq. Basicaly any M4 + accessories other than the SOPMOD. If it violates OPSEC then please DON'T post them.

I checked the forum and the only nice pics I found where the ones posted by Argyll (contractors).

Thank you in advance.

[Tranceaddict]

Airsoft Version (http://images.google.com/imgres?imgurl=http://www.a2g2.com/whatsnew/CQBR/002.jpg&imgrefurl=http://www.a2g2.com/whatsnew/CQBR/&h=274&w=400&sz=155&tbnid=mszqW8v68v4J:&tbnh=82&tbnw=119&start=2&prev=/images%3Fq%3DCQBR%26hl%3Den%26lr%3D%26ie%3DUTF-8)

Check under the Special Forces Of your country, under Navy SEALs.

The CQBR is basically an M4 with a 10.5" upper and a crane stock. Developed by NSW. Google helps.

[pretorian669]

http://www.specwargear.com/images/weapon-CQBR-1.jpg
http://www.specwargear.com/images/weapon-CQBR-2.jpg

http://www.specwargear.com/weapon.html

http://www.canadiantactical.ca/Images/M411.JPG

http://www.canadiantactical.ca/Images/AUCQB.jpg

[pretorian669]

http://img11.photobucket.com/albums/v34/pretorian669/Image4n.jpg

http://img11.photobucket.com/albums/v34/pretorian669/Image1n.jpghttp://img11.photobucket.com/albums/v34/pretorian669/Image2n.jpghttp://img11.photobucket.com/albums/v34/pretorian669/Image3n.jpghttp://img11.photobucket.com/albums/v34/pretorian669/aakjgc.jpg

[mattnwnc03]

ive noticed here and before little numbers on the sleeves of u.s. troops , like the one in the bottom right.what are they for?

[bruce_m4]

Second pic from the bottom left. Is that a Magpul M93 stock he has on his M4?

[ChuckThunder]

Second pic from the bottom left. Is that a Magpul M93 stock he has on his M4?

Sure is.

[DownTown1]

http://auction2.inetu.net/member/aldepal/2131614.jpg
BLACKWATER OPERATORS
http://auction2.inetu.net/member/aldepal/2600105.jpg

[scm77]

Diemaco C8CQB
http://img29.exs.cx/img29/8294/JTF2InHaiti3.jpg
woot

[SMGLee]

http://www.cltactical.com/LMT/LMTMRP-2.jpg

http://www.cltactical.com/Images/LMTMRP-1.jpg

http://www.cltactical.com/KAC/MRE-1.jpg

http://www.cltactical.com/KAC/RAS2-3.jpg

http://www.cltactical.com/KAC/M4_MP5.jpg

http://www.cltactical.com/Pictures/CLTactical/M4crane-1.jpg

http://www.cltactical.com/Pictures/CLTactical/M4crane-5.jpg

http://www.cltactical.com/Pictures/CLTactical/TDCB-06.jpg

[fletch]

any pictures of 6.8mm geing used? or any info about them being used .

[Raistlin]

How do you tell the difference between Colt Commando and M4 CQBR?

[Tranceaddict]

a CQBR uses a 10.5" receiver, so the flash hider is about 1cm after the frontsight. The "commando" has about an inch before the front sight

[Sir Zach of R.]

They're *sniffle* beautiful. *Grabs kleanex and realizes America's guns are cooler than anyone else's* rofl
(Joke. Not meant to piss off Canadians)

[Raistlin]

a CQBR uses a 10.5" receiver, so the flash hider is about 1cm after the frontsight. The "commando" has about an inch before the front sight
So that one is not really CQBR

http://www.cltactical.com/Pictures/CLTactical/M4crane-5.jpg

?

[Tranceaddict]

no, that is not. that's a Diemaco C8 carbine. A CQBR is an M4 with a short barrel (just look at earlier pics)

[Raistlin]

I've taken another look. How would you tell apart a CQBR and a sawn off M4?

[Sir Zach of R.]

You don't "saw" M4s. :bash: :cantbeli: :cantbeli:

[Raistlin]

IDF did already do it on CAR15s...

[pettifogger]

no, that is not. that's a Diemaco C8 carbine. A CQBR is an M4 with a short barrel (just look at earlier pics)

How can you tell it's a Diemaco C8 carbine? Particularly when the lower is marked PWA, an American manufacturer?


I've taken another look. How would you tell apart a CQBR and a sawn off M4?

The KAC RIS? The PRI Big latch? As long as it runs reliably, who cares if it came out of Crane or if it came from MSTN? I don't mean to imply that MSTN "saws-off" barrels, but they do sell weapons with 10.5" barrels that work rather well.

[Raistlin]

The KAC RIS? The PRI Big latch? As long as it runs reliably, who cares if it came out of Crane or if it came from MSTN?
AAAAA - American Association Against Acronym Abuse. :) I'm a computer techie so I know what it's like to use acronyms but, please, save me trouble.

[pettifogger]

The Close Quarters Battle Receiver (CQBR) is an upper receiver for a M4A1 carbine, that has been modified by Naval Surface Warfare Center, Crane Division (NSWC-Crane). The barrel length has been shortened to 10.3". Due to a commercial off-the-shelf (COTS) extractor spring and McFarland gas rings, as well as opening up the gas port, the 10.3" barreled-CQBR runs much better than previous short-barreled efforts.

The CQBR has several parts made by Knight's Armament Company (http://www.knightarmco.com/) (KAC). Knight's Armament Company is a part of Knight's Manufacturing Company, located in some orange groves in Florida, and is owned by C. Reed Knight. KAC is famous for their Stoner Rifle (SR) which include the SR-15, SR-16, SR-25, and SR-50, though they make a great many firearms and firearm-related products.

The standard flash hider has been replaced by a KAC Quick-detach (QD) flash hider. The QD flash hider allows the use of various KAC-made sound suppressors. It can be visually identified by a distinctive notch in the bottom. The handguards have been replaced by a MIL-STD-1913 Modular Weapon System (MWS) rail system made by KAC, called the Rail Interface System (RIS). The RIS was an early KAC rail system. Other KAC rail systems include the Rail Adapter System (RAS), Rail Adapter System Modular Rail Extension (RAS MRE), and Free-Floating Rail Adapter System (FF RAS).

Precision Reflex Inc. (http://www.pri-mounts.com/) (PRI) is another manufacturer, most famous for making the carbon fiber free-floating forearm seen on the Mk 12 Mod 0 Special Purpose Rifle (SPR). The CQBR has the Gasbuster charging handle made by PRI. A distinctive visual feature of the Gasbuster charging handle is the "Big Latch", which is much preferred to the standard latch or the Badger Ordnance Tac-latch, that Marine Expeditionary Units (Special Operations-Capable), or MEU(SOC), use.

Below is a picture of a PRI Gasbuster charging handle.
http://www.pri-mounts.com/detailpages/images/05-072-05.jpg

[thatguy96]

Just think I'll quick add in here, that the SPR program is not Special Purpose Rifle, but Special Purpose Reciever. There were to be three recievers created under the program, one with a rifle length barrel (18-20"), one with a carbine length barrel (14-16") and the CQB-R with a 10.5" barrel. This appears to have the makings of another CAR-15 style misnomer in common usage, for many of the same reasons.

In terms of what was fielded by US forces, it appeared that only the rifle variant had been realized (and then the Navy gave it the designation Mk 12 Mod 0 and later Mod 1), but it appears that weapons inspired by the CQB-R protos are being heavily used by civilian contractors. As for the carbine, it would appear that most of the heavily modified carbines feature KAC free-float rails (FF-RAS) rather than PRI mid-length free-float tubes (as is found on the Mk 12), and I've seen a plethora of stocks (not limited to the Crane retractable one nor to the reinforced 3rd Gen standard retracts either).

[pettifogger]

Once upon a time, SPR was Special Purpose Receiver. Along with the CQBR, it was envisioned that a person would only have one lower receiver and would swap upper receiver depending on the situation, having a choice of the long-distance SPR, the close-distance CQBR, and the standard M4A1. The designation was changed to Special Purpose Rifle, since Crane was building the SPRs as whole rifles, not just upper receivers. CQBRs are being issued as just upper receivers.

I am only aware of the SPR and CQBR and not of an intermediate-length receiver. I can only find documentation referring to the SPR and CQBR. They are referenced as two separate items, not that the CQBR is considered to be a type of SPR. For example, http://www.dtic.mil/ndia/2001smallarms/taylor.pdf

By the 16" rifle, are you referring to the Recon Rifle, which was a rifle configuration built "in-house" by Naval Special Warfare. When they wanted more and sent a request to Crane, it morphed into the SPR. You can read about the Recon Rifle here (http://www.tacticalforums.com/cgi-bin/tacticalubb/ultimatebb.cgi?ubb=get_topic;f=12;t=000723#000006).

The CQBR is indeed in service. pretorian669's post had image of a Navy SEAL team performing a VBSS (Vessel Boarding Search and Seizure). You can read the details of the photo at http://www.news.navy.mil/view_single.asp?id=7863

[thatguy96]

I was mistaken, there is not intermediate length reciever in the requirement, but the rifle component is also shorter than I described. The SPR program originally called for a 16-18" rifle reciever, while it appears that most of the Mk 12 Mod 1s are full 20" weapons.

Also, do you have an official documentation of a change from what the acronym means, or is it just as I mentioned early more a change in what the acronym is commonly referred to as? Somehow I think that technically it probably still stands for Special Purpose Reciever, but in most conversations soldiers and armorers refer to it as the Special Purpose Rifle, simply because no one really cares where the lowers came from (though from the documentation one gets the impression that most of the Mk 12 rifles were either mated to old A1 lowers or to M4A1 lowers).


1. DESCRIPTION: This announcement is for the re-initiation of an earlier project that was delayed due to urgent support of current hostilities. This announcement constitutes a Commercial Agency Announcement (CAA) and a synopsis of an upcoming solicitation. This CAA cancels and replaces SOL N00164-01-R-0103. This CAA is advisory only, alerting industry to the government's plans to publish a Request for Commercial Offerings (RCO) solicitation, and summarizing the future RCO for industry information.

The Navy is issuing this CAA on behalf of the US Special Operations Command (USSOCOM) Special Operation Peculiar Modification (SOPMOD) Program and other federal agencies. A solicitation will be published on or about 19 April 2002 that seeks to award IDIQ contracts to vendor(s) who can provide accessory parts and assemblies for performance improvements to the M16/M4-series rifles/carbines.

Specifically required are Special Purpose Receivers (SPRs) for both short and long range precision fire, with improved MILSPEC 1913 rail interfaces, as well as related improved weapons parts and assemblies. These improvements may be Non-Developmental Items (NDI), Commercial Off-The-Shelf (COTS), or NDI/COTs that can be rapidly developed into suitable items for US Special Operations and Law Enforcement.

2. BACKGROUND: Special Operations Forces (SOF) operates around the world in extreme conditions including underwater, surf-zone, desert, arctic, jungle, and urban environments. They subject their weapons and equipment to extremely high usage rates and stresses. Due to the manner in which SOF utilizes its equipment, normal military specifications are in many cases not stringent enough to support SOF use. Although the currently fielded M16-series Rifles and M4A1 Carbines meet military performance specifications, these weapons have exhibited performance characteristics that do not meet SOF requirements when subjected to the extreme operational conditions imposed upon them by SOF operators.

3. GENERAL, OBJECTIVE 1 (SPR Rail Interface):
Sources are sought for new SOPMOD rail interface designs. The SOPMOD program is not seeking alternate sources for the currently fielded SOPMOD Rail Interface System (RIS, NSN 1005-01-416-1089), rather is seeking alternative Forearm rail subsystems with improved operational performance characteristics:

(a) RAIL POSITIONS:
As with the current SOPMOD RIS, MILSPEC 1913 rails are still required in the 12:00, 3:00, 6:00, and 9:00 positions on the rifle/carbine forearm. As an objective, the SPR 12:00 rail will be continuous and unbroken from the rear of the upper receiver to the forward gas assembly to permit rigid mechanical alignment of eye-axis aiming accessories.

(b) FORWARD COMPATIBILITY WITH FUTURE EGLM:
A rigid or monolithic interface method is desired that will allow a future EGLM to be mounted in the 6:00 position, while

(1) withstanding the shock of firing all currently fielded 40mm Low Velocity rounds,
(2) maintaining zero repeatability of the EGLM when removed and remounted,
(3) allow the EGLM to be mounted as closely to the rifle/carbine barrel as possible without interfering with host weapon barrel harmonics during firing.

4. GENERAL, OBJECTIVE 2 (SPR Performance):
To ensure system balance, also sought are rifle/carbine parts, components, subassemblies, or modifications that enhance reliability, endurance, safety, and operational performance as compared to the current M16/M4 series rifles/carbines. The Government is not seeking alternative sources of current parts for the current M16-series/M4A1 carbines, rather is seeking alternative parts and subassemblies that significantly increase weapon reliability and performance.

(A) PARTS AND SUBASSEMBLIES:
These improvements, listed in priority order of government interest, may include new and improved

(1) magazines,
(2) bolt assemblies/bolt carrier groups,
(3) barrels,
(4) upper receivers and upper receiver groups,
(5) trigger, sear, and hammer sets, (6) ambidextrous weapon controls,
(7) flip-up/spring-up front and rear iron sights,
(8) front and rear pistol grips,
(9) buttstocks, and
(10) bipods any other components of, or mechanical accessories to, the M16-series/M4A1 carbines, with the exception of the lower receiver.

The government wishes to avoid modifications to the lower receiver.

(B) VERSIONS:
The SPR, should be optimized for

(1) precision fire operations, and
(2) a capability to adapt weapon to mission needs with barrel lengths appropriate to the operational mode.

The barrel lengths are nominally 9 to 11.5 inches for close quarters battle and 16 to 18 inches for precision fire. All versions must fit M16/M4 series lower receivers. Parts commonality between the two versions is a secondary goal.

(C) OTHER PERFORMANCE GOALS:

(1) Increased reliability, durability, corrosion resistance, ease of cleaning, lubricity/reduced friction; fully functional for a minimum of 15,000 rounds (Threshold)/30,000 rounds (Objective), performing up to the standards and firing rates to be published in the Solicitation, functional reliability exceeding that of the standard M4A1 carbine at high and low temperature extremes as well as other hostile (sand/dust/dirt/mud/surf) environmental conditions

(2) Improved safety- delay cook-off, fail-safe features, fires/functions safely and without delay of draining in the Over-The-Beach (surf zone, weapon flooded with water) environment.

(3) User Acceptance: operational suitability, increased live-fire hit scores, decreased live-fire engagement times, speed/accuracy of engagement, controllability in semi-automatic and full automatic fire, improved handling qualities, light weight, snag free in movement through vegetation and battlefield obstacles.

Note that that treats both the SPR rifle reciever and the CQB-R under the SPR heading. That was as of March 2002, so while it may have branched off into a seperate project now, it was initially part of the SPR program.

[Some Guy]

Those documents aren't entirely accurate / comprehensive in demonstrating the development of the "SPR" and "CQBR"- both weapons that are in use today arose from the needs of seperate units and date back years before the 2002 document above-
The SPR was originally conceived as a need for a precision upper receiver from both NSW and Army units- At some point in the process a decision was made to construct complete rifles using older M16A1 lowers rather than just building upper receivers... Hence the SPR was now a 'Special Purpose Rifle' rather than receiver- Who knows if there exists a document specifying an acronym change? Building complete rifles would let you include a match trigger and let you test for function in a way that just building the upper alone would not but thats just my conjecture as to why the 'Receiver' became the 'Rifle'

A seperate need for a 'CQB' receiver also arose- giving rise to the 10.3" upper seen in some pics on the previous page- My understanding is that some CQBRs out there started life as 14.5" barrels- others were 10.3" from the start.

Only after the fact of these weapon developments did the document above (and others like it) arise- as kind of an effort to standardize(?) the available weapon options into a accessable / easily acquired kit like the SOPMOD program. This effort has mutated several times over the years with the latest interation being the SCAR program- but the "SPR program" described in the documents above hasn't resulted in fielded hardware yet.

[pettifogger]

They were originally two separate programs, though they appear to have been combined now. Note that the NDIA presentation that I linked to is dated 16 August 2001.

I can not find official documentation of the change from Special Purpose Receiver to Special Purpose Rifle. I am going by what active servemembers have said in SOCNET. I can find documentation of SPR being referred to as Special Purpose Rifle, such as here (http://www.tecom.usmc.mil/g3/Advocate%20Integration/After%20Action%20Reports/20030912%20Gunner%20Symposium.htm) and here (http://www.fbodaily.com/cbd/archive/2000/03(March)/16-Mar-2000/10sol002.htm).

Both the Mk 12 Mod 0 and the Mk 12 Mod 1 use a 18" barrel of a very particular profile, not a 20" barrel. The Mk 12 Mod 0 uses a rifle-length PRI forearm, not the midlength version. You can read full details of the SPR and its history here (http://www.ar15.com/forums/topic.html?b=2&f=134&t=141410), as recorded by Wes Grant of Mid-South Tactical Network (MSTN).

I have yet to see a picture of a SPR with a grenade launcher mounted underneath. :)