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Posted: 7/7/2011 12:07:43 PM EDT
[Last Edit: Lancelot]
So just an introduction to this thread - its purpose is to show off your Block II clone builds; here is a list of some of the common characteristics and equipment that the Block II M4A1s have:
THE Block II Chart (courtesy of Patriot_Man) Barrel: 14.5" M4 or SOCOM contour barrel Flash Hider: KAC NT4 Surefire 4P Suppressors: KAC NT4 Surefire SOCOM RC Rail System: Early Block II M4A1s still used the KAC M4 RIS/RAS DD RIS II in dark earth Vertical grips Tango down battle grip in tan KAC Grip-Pod Rail panels: Tango Down KAC Front sight: KAC flip up in tan standard front sight base (if early Block II with M4 RIS/RAS) Optics: Elcan Specter DR SU-230 EOTech SU-231-PEQ (EOTech 553) EOTech SU-231A-PEQ (EOTech EXPS03) ACOG SU-237 (TA01-ECOS) EOTech/Aimpoint 3x magnifiers IR Lasers: Insight AN/PEQ-15/LA-5 Flashlight: Insight M3 (SU-233/PVS) Insight WMX200 Rear sight: KAC 300m KAC 600m MaTech Buttstock: standard M4 (both older CAR style and newer "LE" style) LMT SOPMOD 
some reference pics  Attached File Attached File
 early block II
 more early Block IIs
Just to reiterate, you don't have to have an EXACT copy of a Block II M4A1 to post your rifle up here, but the purpose is to post pictures of our rifles that we've made specifically to emulate the issue Block II weapon system - if you've got a midlength carbine with an UBR stock that just happens to have a RIS II on it it is likely you did not intend the rifle be a "clone" of the newest generation M4A1, and probably doesn't belong in this picture thread. Rifles that have no Block II components ie standard M4geries with Block I Optics do not embody the purpose of this thread and though they are nice weapons in their own right, shouldn't be posted in this thread to avoid unnecessary clutter. Originally Posted By Augee: The easiest visual discriminator of whether you're looking at a SOPMOD equipped M4A1 or an MWS M4 is usually the identity of who is holding it. If it's a SOF troop, it's probably a SOPMOD M4[A1]. If it's a conventional troop, it's probably an M4 MWS. SOPMOD = SOF MWS = Conventional The SOPMOD program was initially fielded in 1996, and the two have not significantly converged or crossed over at all since then, and there is almost no commonality between systems used in the two. They are separate lines of development and evolution managed by two totally different components (Army and Navy). SOPMOD is run by NSWC-Crane to equip SOF M4A1 Carbines with accessories. There are two distinct "blocks" as identified by NSWC-Crane PowerPoints as the primary source of information, however, there was a "transitional period" of several years in which carbines with items from both blocks were used. Because of a PowerPoint slide that was published (IIRC?) 2006 showing a block labeled "phased replacement," it has become the colloquial term for "transitional" configurations. "Block x" does NOT refer, in an "official" sense to a specific configuration of rifle. It refers to specific modifications (read accessories) to the SOF M4A1 weapon system that are managed by Crane. Colloquially we refer to M4A1s with accessories from the first block of the SOPMOD program as "Block 1," while using "Block 2" to describe carbines with the RIS II, one of the last components of the second block of the SOPMOD program to be fielded. Carbines with the accessories/features of both blocks of the SOPMOD program, but without the RIS II, we refer to as "Phased Replacement." It is important to note, however, that this colloquial classification is generally limited to this thread, and others both here and on other sites that feed off of it. The important thing to understand is that the SOPMOD program is almost always limited to SOF only, and 99% of the time, the "actual" weapon in question will be an M4A1, not an M4. The M4 is a conventional forces weapon system, and is totally separate from the SOPMOD program and SOF modifications, though they were "inspired" by the SOPMOD program, almost every single actual item is different. The M4 is managed by the Army overall through TACOM, though the Marine Corps also manages their own programs through their own directorates for their specific incarnation of the M4. The M4 is a conventional forces platform, and is upgraded through modular weapon system (MWS) upgrades. There are no specific blocks, increments, or generations, and their specifics vary by time period, unit, and MTOE. ~Augee |
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Posted: 2/4/2018 7:52:57 PM EDT
[#1]
Quote HistoryOriginally Posted By Combat_Diver:
These barrels are done by NSW Crane (ie they remove the FSB and dimple the barrel) CD It's this kind of thing that fascinates me. Folks at Crane were able to use their creativity and expertise, and thus saved Uncle Sam a ton of money while getting guns out to the people that needed them in a much more timely manner. Thanks for clearing that up. |
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Posted: 2/4/2018 8:06:24 PM EDT
[#2]
Stupid glitch!
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Posted: 2/4/2018 8:06:48 PM EDT
[#3]
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Posted: 2/4/2018 8:11:55 PM EDT
[#4]
Quote HistoryOriginally Posted By SecretSquirell:
Found this old ass pic of my first B2. Miss this thing 
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MO, USA
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Posted: 2/5/2018 6:33:24 PM EDT
[Last Edit: ckopp636]
[#5]
CQD forward mount and sopmod arrived today. I may switch to a 3 prong but not sure because I really have no use for one. Im gonna put a vortex crossfire II 1-4x24 on here to see how I like it setup like that. Possibly an EXPS3 at some point but an elcan is out of the question
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Posted: 2/5/2018 6:51:54 PM EDT
[#6]
Dat WarComp Doe!
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Posted: 2/5/2018 9:48:16 PM EDT
[#7]
Quote HistoryOriginally Posted By MILSPEC556:
Found this old ass pic of my first B2. Miss this thing https://i.imgur.com/LpLgYg3.jpg |
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Posted: 2/6/2018 2:17:54 AM EDT
[#8]
Quote HistoryOriginally Posted By GHPorter:
What were you using to hold your pressure switch on? It looks like transparent dental floss... Quote HistoryOriginally Posted By GHPorter:
Originally Posted By MILSPEC556:
Found this old ass pic of my first B2. Miss this thing https://i.imgur.com/LpLgYg3.jpg |
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Posted: 2/7/2018 12:40:52 PM EDT
[Last Edit: voodoo303]
[#9]
I picked up a DDM4 a few years ago. Recently cut off the flash hider and pinned on a SC3P, wasn't too hard.
 
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MI, USA
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Posted: 2/8/2018 9:36:51 PM EDT
[#10]
Is the socom rc2 7.62 clone correct, i wanna get the 556 but dont wanna have to deal getting another can for 30 cal rifle.
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TX, USA
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Posted: 2/8/2018 9:39:27 PM EDT
[#11]
Quote HistoryOriginally Posted By iMONOob11:
Is the socom rc2 7.62 clone correct, i wanna get the 556 but dont wanna have to deal getting another can for 30 cal rifle.
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Posted: 2/8/2018 9:40:41 PM EDT
[#12]
Originally Posted By iMONOob11:
Is the socom rc2 7.62 clone correct, i wanna get the 556 but dont wanna have to deal getting another can for 30 cal rifle. Originally Posted By Spooled:
Get a mini and don't tell anyone
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MI, USA
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Posted: 2/8/2018 9:45:13 PM EDT
[#13]
Quote HistoryOriginally Posted By aaron580: Not even close to correct
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Posted: 2/8/2018 9:57:42 PM EDT
[Last Edit: FreefallRet]
[#14]
Quote HistoryOriginally Posted By iMONOob11:
Is the socom rc2 7.62 clone correct, i wanna get the 556 but dont wanna have to deal getting another can for 30 cal rifle. Sad thing is it is not quiet, but I didn't expect much from a 6.2" can. This is my 762 Mini on my block II 
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MI, USA
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Posted: 2/8/2018 10:12:44 PM EDT
[#15]
Another question can any of the 556 muzzle devices fit on the 762 can. might have to just get the 556 if not.
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Posted: 2/8/2018 10:38:49 PM EDT
[#16]
Quote HistoryOriginally Posted By iMONOob11:
Another question can any of the 556 muzzle devices fit on the 762 can. might have to just get the 556 if not. |
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Posted: 2/8/2018 11:02:05 PM EDT
[#17]
Quote HistoryOriginally Posted By Mb121:
7.62 and 5.56 SOCOM cans will fit on the 5.56 FH and MB. 7.62 MB and FH will only accept 7.62. This is all based on my understanding, someone correct me if I am wrong. Quote HistoryOriginally Posted By Mb121:
Originally Posted By iMONOob11:
Another question can any of the 556 muzzle devices fit on the 762 can. might have to just get the 556 if not. |
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MI, USA
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Posted: 2/8/2018 11:40:17 PM EDT
[Last Edit: iMONOob11]
[#18]
Quote HistoryOriginally Posted By SecretSquirell:
From my limited testing, you're correct. I've got one of those SF Trainer cans in 556 (even though the "end cap" is wide open) and it will not mount to my 762 brake on my 700. edit: nvm i got what ya said.
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Posted: 2/9/2018 12:03:16 AM EDT
[Last Edit: MILSPEC556]
[#19]
Quote HistoryOriginally Posted By iMONOob11:
reason i ask is cause it doesnt look like surefire makes a 762 device 1/2x28 threads. edit: nvm i got what ya said. Quote HistoryOriginally Posted By iMONOob11:
Originally Posted By SecretSquirell:
From my limited testing, you're correct. I've got one of those SF Trainer cans in 556 (even though the "end cap" is wide open) and it will not mount to my 762 brake on my 700. edit: nvm i got what ya said. |
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Posted: 2/9/2018 2:48:14 AM EDT
[Last Edit: brodband8]
[#20]
Combat_Diver, I'm aware of the 14.5 inch govt profile and socom profile colt bbls. But what about the 14.5 colt socom profile bbls without the m203 cuts? Any info on those being used?
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Posted: 2/9/2018 3:03:05 AM EDT
[#21]
Quote HistoryOriginally Posted By brodband8:
Combat_Diver, I'm aware of the 14.5 inch govt profile and socom profile colt bbls. But what about the 14.5 colt socom profile bbls without the m203 cuts? Any info on those being used? CD |
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Posted: 2/9/2018 3:51:08 AM EDT
[#22]
Quote HistoryOriginally Posted By Combat_Diver: None, as then they aren't a spec'd barrel. Even the 10.3" FN SOCOM barrels have M203 cuts. CD thanks |
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Posted: 2/9/2018 3:06:59 PM EDT
[#23]
Socom RC arrived at my SOT yesterday. Im heading out there today or tomorrow to try her on for size and give him my stuff for the form 4...
Pic Thread 
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MI, USA
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Posted: 2/9/2018 3:55:09 PM EDT
[#24]
Quote HistoryOriginally Posted By FREEFALLE7:
I have a 762 SOCOM mini and it looks like the clone correct 556 version(same lenth). Best thing is I can use it on my ARs and SR25. Sad thing is it is not quiet, but I didn't expect much from a 6.2" can. This is my 762 Mini on my block II https://www.AR15.Com/media/mediaFiles/20856/IMG_2313_JPG-437384.jpg |
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FL, USA
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Posted: 2/9/2018 6:11:13 PM EDT
[#25]
Quote HistoryOriginally Posted By iMONOob11:
How many db's louder do you think it is than the regular 556 can. It's some level louder, but can you tell? Maybe, but probably not. I used to run my 7.62 Mini on my MK12 before I got an AEM can and it wasn't noticeably louder than the 5.56 RC can. It probably was measurably louder, but it's not like the SF cans are going to be the quietest thing anyway. I will say that the 7.62 Mini maintained the absolute laser beam accuracy of my MK12...something that my quieter AEM can doesn't do. Obviously the two factors (noise and accuracy) aren't related, but it was a thing. |
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USA
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Posted: 2/9/2018 6:26:40 PM EDT
[#26]
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GA, USA
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Posted: 2/9/2018 8:12:36 PM EDT
[#27]
How many people run sf m300s on their block 2? I got one laying around so it would save me a few hundred from buying an m600.
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MI, USA
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Posted: 2/9/2018 8:33:09 PM EDT
[#28]
Quote HistoryOriginally Posted By Silverww:
How many people run sf m300s on their block 2? I got one laying around so it would save me a few hundred from buying an m600.
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Posted: 2/9/2018 8:42:08 PM EDT
[#29]
Quote HistoryOriginally Posted By Silverww:
How many people run sf m300s on their block 2? I got one laying around so it would save me a few hundred from buying an m600. |
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Posted: 2/10/2018 11:35:31 AM EDT
[#30]
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Posted: 2/10/2018 12:39:27 PM EDT
[#31]
Pics long overdue but thanks to everyone who helped me get this thing together. Time to take her out and break her in. How did I do?
 Attached File |
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Posted: 2/10/2018 12:42:06 PM EDT
[#32]
Quote HistoryOriginally Posted By DoubleTap556:
Pics long overdue but thanks to everyone who helped me get this thing together. Time to take her out and break her in. How did I do? https://www.AR15.Com/media/mediaFiles/155739/IMG_0008-447225.JPG 
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Posted: 2/10/2018 12:56:42 PM EDT
[#33]
Quote HistoryOriginally Posted By Jlgil73:
Socom RC arrived at my SOT yesterday. Im heading out there today or tomorrow to try her on for size and give him my stuff for the form 4... Pic Thread https://farm5.staticflickr.com/4674/39273757925_33d620c2a7_o.jpg |
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Posted: 2/10/2018 2:14:52 PM EDT
[#34]
Quote HistoryOriginally Posted By AR_Marv:
Nice looking rifle! I'm thinking of doing an ACOG for my block II FSP build. Is that a TA31ECOS? Have those been discontinued? I don't see many places selling them. Also reviewing the partslist on page 1 I don't see the ACOG listed as an optic that came on a block II. Was it a carryover from block 1/1.5? Thanks Quote HistoryOriginally Posted By AR_Marv:
Originally Posted By Jlgil73:
Socom RC arrived at my SOT yesterday. Im heading out there today or tomorrow to try her on for size and give him my stuff for the form 4... Pic Thread https://farm5.staticflickr.com/4674/39273757925_33d620c2a7_o.jpg The SU-237 ACOG seems to have been a PR optic. I'm not sure if it was widely fielded because the Elcan ended up taking that role. It's still available from Trijicon but isn't exactly like the original. They were originally tan anodized with a Docter red dot and ARMS mount. The new ones are tan cerakote with an RMR and Bobro mount. 
I plan on using one also when I build up my FSP Block II. 
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Posted: 2/10/2018 2:29:47 PM EDT
[#35]
Quote HistoryOriginally Posted By HD2006: @AR_Marv The SU-237 ACOG seems to have been a PR optic. I'm not sure if it was widely fielded because the Elcan ended up taking that role. It's still available from Trijicon but isn't exactly like the original. They were originally tan anodized with a Docter red dot and ARMS mount. The new ones are tan cerakote with an RMR and Bobro mount. https://i.imgur.com/5wChfGoh.jpg I plan on using one also when I build up my FSP Block II. https://i.imgur.com/l6buBxdh.jpg |
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MO, USA
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Posted: 2/10/2018 2:45:58 PM EDT
[Last Edit: ckopp636]
[#36]
Quote HistoryOriginally Posted By voodoo303:
I picked up a DDM4 a few years ago. Recently cut off the flash hider and pinned on a SC3P, wasn't too hard. https://s5.postimg.org/50i6oxxd3/3_F21996_C-6229-47_DA-8112-_E9_AD6_F926_B78.jpg https://s5.postimg.org/ext7i0con/8_D2_EE44_C-49_FB-4423-_AE1_E-7_D305_C30_B675.jpg https://s5.postimg.org/87cq8kx8n/F5_AC36_E6-27_B2-4_B33-_BE3_E-31602561_E933.jpg How much over 16" do you get with a surefire 3 prong mounted? I know they are longer but not sure how much. Of course the amount of shims used will change it a little bit. Right now Im about 16 1/16" which really Id feel more comfortable being slightly more than that over 16 |
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USA
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Posted: 2/10/2018 4:41:30 PM EDT
[#37]
I always get rid of my KAC front sights just to get another one later on. This is number four.
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Posted: 2/10/2018 9:04:48 PM EDT
[#38]
Quote HistoryOriginally Posted By AR_Marv: Nice looking rifle! I'm thinking of doing an ACOG for my block II FSP build. Is that a TA31ECOS? Have those been discontinued? I don't see many places selling them. Also reviewing the partslist on page 1 I don't see the ACOG listed as an optic that came on a block II. Was it a carryover from block 1/1.5? Thanks |
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Posted: 2/10/2018 9:46:46 PM EDT
[#39]
Quote HistoryOriginally Posted By Conner378:
The acog was so common for mil, there are pics of ta01nsn's and ta31's also. Quote HistoryOriginally Posted By Conner378:
Originally Posted By AR_Marv: Nice looking rifle! I'm thinking of doing an ACOG for my block II FSP build. Is that a TA31ECOS? Have those been discontinued? I don't see many places selling them. Also reviewing the partslist on page 1 I don't see the ACOG listed as an optic that came on a block II. Was it a carryover from block 1/1.5? Thanks |
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Posted: 2/11/2018 3:44:05 PM EDT
[#40]
Starting to gather parts for an FSP build.
And attempting to get better potato pics of my non FSP 
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Posted: 2/11/2018 4:01:38 PM EDT
[#41]
Here we go again. I just can’t not have a Block II it seems.
 Attached FileI have the RIS II, a tan LMT SOPMOD, and a KAC rear sight. Now I just need everything else. Probably going to put a Razor on it, are there any in the wild instances of Razors on BIIs or is that exclusive to the B3 stuff that’s trickling in? |
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Posted: 2/11/2018 4:39:28 PM EDT
[#42]
I am 90% sure Stukas had one on his issued Bk II.
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Posted: 2/11/2018 4:54:21 PM EDT
[#43]
Quote HistoryOriginally Posted By imdBman:
I am 90% sure Stukas had one on his issued Bk II.  Attached File |
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USA
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Posted: 2/11/2018 8:44:28 PM EDT
[#44]
Quote HistoryOriginally Posted By nate_the_great:
Probably going to put a Razor on it, are there any in the wild instances of Razors on BIIs |
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Posted: 2/11/2018 10:46:22 PM EDT
[#45]
Quote HistoryOriginally Posted By StealthGuy:
Yes Quote HistoryOriginally Posted By StealthGuy:
Originally Posted By nate_the_great:
Probably going to put a Razor on it, are there any in the wild instances of Razors on BIIs |
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Posted: 2/11/2018 11:11:00 PM EDT
[#46]
Quote HistoryOriginally Posted By nate_the_great:
Riding in a Geissele mount I presume? Quote HistoryOriginally Posted By nate_the_great:
Originally Posted By StealthGuy:
Originally Posted By nate_the_great:
Probably going to put a Razor on it, are there any in the wild instances of Razors on BIIs |
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Posted: 2/12/2018 12:27:34 AM EDT
[#47]
Quote HistoryOriginally Posted By Mb121:
7.62 and 5.56 SOCOM cans will fit on the 5.56 FH and MB. 7.62 MB and FH will only accept 7.62. This is all based on my understanding, someone correct me if I am wrong. Quote HistoryOriginally Posted By Mb121:
Originally Posted By iMONOob11:
Another question can any of the 556 muzzle devices fit on the 762 can. might have to just get the 556 if not. |
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Posted: 2/12/2018 12:31:00 AM EDT
[#48]
Quote HistoryOriginally Posted By gatordev:
Short answer: who cares? It's some level louder, but can you tell? Maybe, but probably not. I used to run my 7.62 Mini on my MK12 before I got an AEM can and it wasn't noticeably louder than the 5.56 RC can. It probably was measurably louder, but it's not like the SF cans are going to be the quietest thing anyway. I will say that the 7.62 Mini maintained the absolute laser beam accuracy of my MK12...something that my quieter AEM can doesn't do. Obviously the two factors (noise and accuracy) aren't related, but it was a thing. Quote HistoryOriginally Posted By gatordev:
Originally Posted By iMONOob11:
How many db's louder do you think it is than the regular 556 can. It's some level louder, but can you tell? Maybe, but probably not. I used to run my 7.62 Mini on my MK12 before I got an AEM can and it wasn't noticeably louder than the 5.56 RC can. It probably was measurably louder, but it's not like the SF cans are going to be the quietest thing anyway. I will say that the 7.62 Mini maintained the absolute laser beam accuracy of my MK12...something that my quieter AEM can doesn't do. Obviously the two factors (noise and accuracy) aren't related, but it was a thing. |
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OR, USA
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Posted: 2/12/2018 2:03:34 AM EDT
[#49]
A question for the SOPMOD historians. Was there any pattern, rhyme or reason as far as which units ended up with RIS II FSP vs non-FSP? I only ask as all the MARSOC and Ranger photos I've seen have been non-FSP, and I don't think I've ever seen a photo of SEALs using either. Maybe that's because those are the only photos I have happened across, or maybe some of these units only ever had one or the other? Thanks!
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Posted: 2/12/2018 2:13:57 AM EDT
[#50]
Quote HistoryOriginally Posted By kwill:
A question for the SOPMOD historians. Was there any pattern, rhyme or reason as far as which units ended up with RIS II FSP vs non-FSP? I only ask as all the MARSOC and Ranger photos I've seen have been non-FSP, and I don't think I've ever seen a photo of SEALs using either. Maybe that's because those are the only photos I have happened across, or maybe some of these units only ever had one or the other? Thanks! 
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