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The gap thread (Page 1 of 2)
Posted: 3/10/2024 11:38:06 AM EDT
[Last Edit: hoody2shoez][Edited]
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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* |
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Q 12" rail-measures around 11.75" at the wings. 12.5" criterion Griffin plan a flash hider Attached File |
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 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 |
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 ruler numbers should read right side up1) 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 |
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 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. |
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• Troy Alpha Rail- 9" •Unknown Barrel- 10" • Standard GI A1 Flash Hider (Unknown MFG) • Griffin Armament M4SD (Gate Lok) Attached File Attached File |
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 ruler numbers should read upright1) 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. |
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4" FX9 Cheapo Davidson 4" handguard YHM R9 with SRX mount 0.026" gap Attached File Attached File |
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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. Attached File Attached File |
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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 Attached File . Attached File |
Why is the sky blue?
What makes the green grass grow?
What makes the green grass grow?
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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"  |
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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:  
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Attached File 10.3" barrel RIS III 9.55" handguard Rearden SPB LPM Torch with a Diligent Defense Zilch hub mount |
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Best gap Attached File Does this count? Not really what you want, huh? Attached File Attached File Attached File Or this? Attached File Large gap Attached File |
I wouldn't stand in front of a piss-filled supersoaker. Does that make it a good pistol? - Caboose314
I thought I was covered for 22 cans, but the NFAids is a bitch when it mutates - themagikbullet
I thought I was covered for 22 cans, but the NFAids is a bitch when it mutates - themagikbullet
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Just waiting on my 5x5 to be approved Attached File Attached File |
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Originally Posted By bradpierson26: Best gap https://www.ar15.com/media/mediaFiles/184182/IMG_4738_jpeg-3210753.JPG Does this count? Not really what you want, huh? https://www.ar15.com/media/mediaFiles/184182/IMG_3112_jpeg-3210739.JPG https://www.ar15.com/media/mediaFiles/184182/IMG_5264_jpeg-3210751.JPG https://www.ar15.com/media/mediaFiles/184182/IMG_4280_jpeg-3210738.JPG Or this? https://www.ar15.com/media/mediaFiles/184182/IMG_2226_jpeg-3210740.JPG Large gap https://www.ar15.com/media/mediaFiles/184182/IMG_1956_jpeg-3210741.JPG Internet winner |
Those who would give up essential liberty, to obtain a little temporary safety, deserve neither liberty nor safety
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Attached File ETA adding relevant details Handuard: FCD RHF4 9.5 Barrel: DD 10.3 Muzzle device: Griffin dual-lok brake Suppressor: Griffin HRT556 |
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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 Gap .099"  |
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Attached File 10.3" barrel 9.5" RIS III Diligent Defense Zilch adapter+LPM Torch |
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Black Rain 10.5" ALG 10" KVP direct thread mount Ecco 5x5 ~0.03" gap Attached File |
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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 
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Dead Air Sierra 5 Dead Air flash hider Centurion Arms 11.5” barrel Centurion Arms 10.5” CMR handguard Attached File |
Do you see me, Toecutter?
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11.5” MI Combat Rail 12.5” Criterion Hybrid barrel Griffin taper mount EZ brake Attached File 11.5” Cross Machine DRT handguard 12.5” Geissele CHF barrel Griffin taper mount hammer comp (old style) Attached File 12” Q Honey Badger handguard 12.5” SOLGW CHF V2 barrel Griffin taper mount hammer comp (new style) Attached File |
“Necessary? Is it necessary for me to drink my own urine? No, but I do it anyway because it’s sterile and I like the taste.” -Patches O’Houlihan
"I don't eff with poorsies."
-Mona-Lisa Saperstein
"I don't eff with poorsies."
-Mona-Lisa Saperstein
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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 Attached File |
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Attached File DD RIS III 9.5 Colt 10.3" barrel CAT/Specter Alleycat 5.56 with two shims on the factory QD mount |
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My ar10 12.5" BA barrel. 12.3" Guntec DPMS low rail Yhm 30LT can. 
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Proud member of Team Ranstad.
Arfcom St Jude Mafia 3 years
Arfcom callsign: trenchfoot
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.  
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Attached File Pardon the three pixel pic Attached File |
Those who would give up essential liberty, to obtain a little temporary safety, deserve neither liberty nor safety
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Wilson Combat 8" 300 BO Barrel KAK 7.2" Rail Griffin Plan A Taper Mini Flash Hider MD Griffin Plan A Alpha Taper HUB Mount Rugged Obsidian 9 Suppressor Just got the Griffin Plan A stuff in today, I'll get some better pics and measurements when I can..   Better light pics  
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Lord help us all
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Attached File Centurion cut down to approx 11.3" DD RIS II 9.55" OCL Midway Adapter OCL OCM5 suppressor |
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The gap thread (Page 1 of 2)
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