Warning

 

Close

Confirm Action

Are you sure you wish to do this?

Confirm Cancel
BCM
User Panel

Site Notices
Posted: 3/10/2024 11:38:06 AM EDT
[Last Edit: hoody2shoez]
Rules
1-no discussions. This is for documenting and quick reference only.
2-posts must have pictures
3-specs must be listed:handguard length, barrel length, attachment method, any other spec you deem important
*See first post for an example*
Link Posted: 3/10/2024 11:40:04 AM EDT
[#1]
Q 12" rail-measures around 11.75" at the wings.
12.5" criterion
Griffin plan a flash hider

Attachment Attached File
Link Posted: 3/10/2024 12:32:49 PM EDT
[Last Edit: lxranes] [#2]
Complete solgw 13.7 upper. 13" m76 hand guard. Dead air Sandman S
Link Posted: 3/10/2024 12:44:51 PM EDT
[Last Edit: 1168RGR] [#3]

Ruler numbers should read upside down

1) Larue 7” (7.25” from receiver rail), Griffin taper mount, Faxon 8.5” ***9mm*** bbl

2) Griffin 11.5” SR rail (nominal=actual), Roscoe 7.5” ***9mm*** bbl, SiCo 3 lug, Omega 45k; 1.5” sticking out

3) Larue 9” (9.25” from receiver rail), Griffin Gate-Lok with overtravel stop (A2 FH), DD 10.3” bbl
Link Posted: 3/10/2024 12:57:09 PM EDT
[Last Edit: 1168RGR] [#4]
ruler numbers should read right side up

1) URX4 10” (nominal=actual), Griffin Gate-Lok with overtravel stop washer, M4SDk alongside at mounted length, BA 11.3” bbl

2) DDM4 10” (10 1/8), Griffin taper mount*, XCaliber 12” ***9mm*** bbl

*modified for 9mm
Link Posted: 3/10/2024 1:12:48 PM EDT
[Last Edit: 1168RGR] [#5]
ruler numbers should read upright. Actual gaps are 11/16, or just under 3/4.

1)URX4 10.75” (actual=nominal), Griffin Gate-Lok with overtravel stop washer, BA 12.3” bbl

2) Larue 11 (and 3/16)”, Criterion Core 12.5”, Griffin Taper

3) Larue 11, New Frontier 12.5” ***9mm***, (actual length is 13”), Griffin taper

4) Larue 11, Griffin taper, Hodge 12.5” bbl

Notice that 9mm barrels are about 1/2 inch shorter than 5.56 barrels externally, when both measure the same using ATF method internally.
Link Posted: 3/10/2024 1:22:51 PM EDT
[#6]
ruler should read upright. Actual gap is 1.25”

1) RIS II 12 (and 1/2)”, Colt 14.5” bbl

2) DDM4 12 (.4)” Noveske 14.5” stainless bbl
Link Posted: 3/10/2024 1:41:22 PM EDT
[#7]
ruler numbers should read upright. Top two gaps are 1/4”.

1) Larue 12 (.3)”, MOS Tek 13.5” bbl

2) Wolfpack Armory 16” pre-production gun with 15” rail, Griffin taper mount

3) PSA K-Mart 605 FSB/16” with Griffin Gate Lok and overtravel stop washer
Link Posted: 3/10/2024 1:50:49 PM EDT
[#8]
• Troy Alpha Rail- 9"
•Unknown Barrel- 10"
• Standard GI A1 Flash Hider (Unknown MFG)
• Griffin Armament M4SD (Gate Lok)

Attachment Attached File


Attachment Attached File
Link Posted: 3/10/2024 1:55:11 PM EDT
[#9]
ruler numbers should read upright

1) Larue 13”, measured, WOA SPR 18” bbl, 2-piece Allen/Ops SPR mount, probably from OCL

2) URX4 14.5 (14 11/16”) rail, Faxon 18” Gunner, Griffin taper mount. Gap is 2 11/16”

PM me if y’all need clarification on these pictures and I’ll edit my posts next time I’m bored.
Link Posted: 3/10/2024 4:30:38 PM EDT
[#10]
10.3"
Daniel Defense MK18 RIS II
Surefire 4 Prong
SureFire RC2

Link Posted: 3/10/2024 5:11:07 PM EDT
[Last Edit: RDTCU] [#11]
4" FX9
Cheapo Davidson 4" handguard
YHM R9 with SRX mount
0.026" gap
Attachment Attached File
Attachment Attached File
Link Posted: 3/10/2024 5:35:49 PM EDT
[#12]

7.94″ 300 Blackout
Cherry Bomb muzzle brake by Q
7” NHR handguard with the 7.94” barrel will return a .060” clearance from end of handguard to barrel thread shoulder
Plan B attachment
Dead Air Nomad30


Link Posted: 3/11/2024 6:33:52 AM EDT
[#13]
11.5” BA barrel, Griffin Recce 5 Mod 4, with Geissele Mk4 Federal rail. Gap to the back of the muzzle brake is about 13/16” and gap to the back of the suppressor is 7/8”.

I’ll update it after I get my 10.5” Mk16 in hand and swap rails. Ideally it closes the gap by exactly 1/2” but we’ll see.
Attachment Attached File

Attachment Attached File
Link Posted: 3/11/2024 9:43:01 AM EDT
[Last Edit: 11boomboom] [#14]
Geissele Mk.8 9.3" MLOK rail
10.5" PSA Nitride Barrel
YHM Phantom QD with YHM Turbo T3

It's about 1/2" of space before the back of the muzzle device
Attachment Attached File
.

Attachment Attached File
Link Posted: 3/11/2024 3:49:17 PM EDT
[Last Edit: spyderboy03] [#15]
13.5" tabbed Geissele Mk16 chopped to 11.75"
12.5" Geissele barrel
YHM Turbo K
YHM sRx adapter
YHM sRx long flash hider (YHM sRx mini brake would cut at least .2" off of gap)
Gap .35"
This was originally cut for plan A on a 12.5" Criterion Core barrel. Wish I would have left the 1/8" of so that I trimmed after the initial chop.


9.3" Geissele Mk16 chopped to a hair over 7-11/16"
8.5" Criterion Core .300 BLK barrel
YHM Resonator K
YHM sRx adapter
YHM sRx mini brake
Gap .0975"

Link Posted: 3/11/2024 6:05:27 PM EDT
[Last Edit: 11B3XCIB] [#16]
Rail:  Centurion Arms 13” CMR MLok
Barrel:  Criterion 13.9” 5.56  (barrel isn’t true 13.9”, more like .7”)
Mount: Griffin Armament 2.75” flash hider P/W
Suppressor:  Griffin Armament Recce 5



FH only for reference:



Before I got the 2.75” FH, I had a micro FH that tucked a portion of the taper mount adapter for my Optimus Micro under the rail:


Link Posted: 3/11/2024 6:26:56 PM EDT
[#17]
Rail: 9.5” Geissele Mk14
Barrel: 10.5” FN 5.56
Muzzle device: Griffin EZ brake
Suppressor: AAC Mini-4 with Ecco HUB conversion


Link Posted: 3/13/2024 6:19:43 PM EDT
[#18]
Attachment Attached File


10.3" barrel
RIS III 9.55" handguard
Rearden SPB
LPM Torch with a Diligent Defense Zilch hub mount
Link Posted: 3/14/2024 7:51:04 PM EDT
[#19]
10.5 RIS III, 11.3 Wilson Combat, SF4P









Link Posted: 5/7/2024 1:38:03 PM EDT
[#20]
Bump to keep from archive
Link Posted: 5/9/2024 8:54:29 PM EDT
[#21]
Griffin Armament Low-Pro Rigid MLok Rail - 8.6"
Ballistic Advantage 9" .300 BLK
Silencerco ASR Single Port Brake & Omega can


Link Posted: 5/10/2024 12:19:54 AM EDT
[#22]
Some tight gaps...
Link Posted: 5/10/2024 12:33:55 PM EDT
[#23]
Link Posted: 5/10/2024 7:11:18 PM EDT
[Last Edit: bradpierson26] [#24]
Best gap

Attachment Attached File


Does this count? Not really what you want, huh?

Attachment Attached File


Attachment Attached File


Attachment Attached File


Or this?

Attachment Attached File


Large gap

Attachment Attached File

Link Posted: 5/10/2024 7:34:34 PM EDT
[Last Edit: RDTCU] [#25]
Just waiting on my 5x5 to be approved
Attachment Attached File

Attachment Attached File
Link Posted: 5/11/2024 11:08:59 PM EDT
[#26]
Link Posted: 5/11/2024 11:12:57 PM EDT
[Last Edit: 135Patriots] [#27]
Attachment Attached File


ETA adding relevant details
Handuard: FCD RHF4 9.5
Barrel: DD 10.3
Muzzle device: Griffin dual-lok brake
Suppressor: Griffin HRT556
Link Posted: 5/14/2024 11:40:48 AM EDT
[#28]
Reminder to read the rules. This thread is for people to quick reference if a particular mounting system will fit their handguard/barrel combo. Thanks
Link Posted: 5/16/2024 10:45:25 PM EDT
[#29]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By spyderboy03:
13.5" tabbed Geissele Mk16 chopped to 11.75"
12.5" Geissele barrel
YHM Turbo K
YHM sRx adapter
YHM sRx long flash hider (YHM sRx mini brake would cut at least .2" off of gap)
Gap .35"
This was originally cut for plan A on a 12.5" Criterion Core barrel. Wish I would have left the 1/8" of so that I trimmed after the initial chop.
https://i.imgur.com/UvBOcFA.jpg
View Quote
Replaced the long flash hider with the mini brake.
Gap .099"


Link Posted: 5/20/2024 11:43:28 PM EDT
[#30]
Attachment Attached File


10.3" barrel
9.5" RIS III
Diligent Defense Zilch adapter+LPM Torch
Link Posted: 5/21/2024 9:34:16 PM EDT
[#31]
Black Rain 10.5"
ALG 10"
KVP direct thread mount
Ecco 5x5
~0.03" gap

Attachment Attached File
Link Posted: 5/23/2024 10:00:29 AM EDT
[#32]
4.5” barrel
4.0” Hand guard
Griffin Ez-Lok SMG/PCC muzzle device.
Ti-Rant/Obsidian with Ez-Lok piston.


I don’t have any way to measure the gaps. You really can’t see it but there is a gap there. This setup 100% absolutely would not work without the Ez-Lok muzzle device acting as a barrel extension.

What’s going on underneath the rail


Ti-Rant


Obsidian
Link Posted: 5/23/2024 4:09:07 PM EDT
[#33]
Seekins Precision SBR8 - 8" 300BLK barrel w/12" handguard.  Silencerco Omega inside...

Link Posted: 5/25/2024 4:39:43 PM EDT
[#34]
Dead Air Sierra 5
Dead Air flash hider
Centurion Arms 11.5” barrel
Centurion Arms 10.5” CMR handguard

Attachment Attached File
Link Posted: 7/3/2024 11:14:04 AM EDT
[#35]
11.5” MI Combat Rail
12.5” Criterion Hybrid barrel
Griffin taper mount EZ brake
Attachment Attached File


11.5” Cross Machine DRT handguard
12.5” Geissele CHF barrel
Griffin taper mount hammer comp (old style)
Attachment Attached File


12” Q Honey Badger handguard
12.5” SOLGW CHF V2 barrel
Griffin taper mount hammer comp (new style)
Attachment Attached File
Link Posted: 7/15/2024 10:35:33 PM EDT
[#36]
11.5” Sionics barrel
10.5” Geissele Mk16
Griffin EZ Brake
Recce 5

1/4” between handguard and back of the brake, 3/8” between handguard and back of the suppressor

Attachment Attached File
Link Posted: 7/24/2024 4:46:17 PM EDT
[Last Edit: 135Patriots] [#37]
Attachment Attached File


DD RIS III 9.5
Colt 10.3" barrel
CAT/Specter Alleycat 5.56 with two shims on the factory QD mount
Link Posted: 8/9/2024 6:16:30 PM EDT
[Last Edit: spyderboy03] [#38]
Noveske Diplomat 7.94" 300 barrel
Geissele tabbed 7" rail (factory)
Wolfpack Armory recessed Night Howler & low profile adapter.

Link Posted: 8/9/2024 6:32:49 PM EDT
[Last Edit: d16man] [#39]
Link Posted: 8/29/2024 3:19:34 AM EDT
[Last Edit: Alien] [#40]
I think you can fit a thin sheet of paper under my Xeno adapter. 12.5" barrel with an LMT Xeno 3 prong and a thick Accuwasher to time it with a prong at the 6 o'clock, and a 12.5" RIS III handguard. Seriously when I first put it altogether, I thought I had royally screwed up by telling ADCO to cut the barrel to 12.5" as I didn't do the measurement with the LMT muzzle device when I arrived at that length, as I was using the Dead Air Xeno brake at the time. It literally turned out to be as close as you could possibly get without getting any rubbing against the handguard while the barrel flexes while shooting.


Link Posted: 8/29/2024 2:08:55 PM EDT
[#41]
16" Centurion Mk12 barrel, Larue 13.2" quad rail, AEM5, custom collar by Ron Allen.

7 turns on the AEM5.



Link Posted: 9/8/2024 1:22:06 PM EDT
[Last Edit: Rob-H] [#42]
Colt 6920, 16" bbl, Daniel Defense DDM4 15.2" rail, Dead Air Keymo flash hider, Dead Air Sandman.

Untitled [url=https://www.flickr.com/photos/132030671@N02/]" />

AR10, 16" Faxon bbl, Wilson Combat 14.6" Handguard, Dead Air Keymo flash hider, Dead Air Sandman.

Untitled , on Flickr
Link Posted: 9/16/2024 3:37:38 PM EDT
[#43]
12.5" centurion 5.56 barrel, DD RIS II trimmed to 11.75-11.85", YHM Turbo K and OCL DT



Link Posted: 9/19/2024 1:31:23 AM EDT
[#44]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Three0h8:
12.5" centurion 5.56 barrel, DD RIS II trimmed to 11.75-11.85", YHM Turbo K and OCL DT


View Quote


Link Posted: 9/22/2024 12:52:00 PM EDT
[#45]
Gun: 11" CZ Bren 2
Handguard: HBI 10.8"
Suppressor: GA Recce 5K
Muzzle Device: GA Taper EZ Brake


Link Posted: 9/25/2024 10:30:30 AM EDT
[#46]
BCM 11.5" barrel
Samson 11" SXT handguard
KGM R-556 w/ KGM muzzlebrake mount





Link Posted: 10/6/2024 8:03:43 PM EDT
[Last Edit: DefenderAO] [#47]
Attachment Attached File


Pardon the three pixel pic

Attachment Attached File
Close Join Our Mail List to Stay Up To Date! Win a FREE Membership!

Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!

You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.


By signing up you agree to our User Agreement. *Must have a registered ARFCOM account to win.
Top Top