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Posted: 10/8/2015 12:58:56 PM EDT
[#1]
Quoted:
i am building my first sbr and looking hard at this upper. anyone know if my AAC omni can will work with it? the omni is a QD that mounts over an a2 FH. wondering if the rail will have enough clearance for the mount. I don't know the answer to your specific question, but my 556SD fits on my Mk18 just fine using a standard 51t mount. ETA - pic below. I'm guessing you need someone with that exact config or the calcs for threads + FH - can offset. 
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Posted: 10/8/2015 1:00:21 PM EDT
[#2]
I'm pretty sure at minimum you will have to change out the FH. Pretty sure the DD standard FH is longer than the a2 style. As far as the can, how far past the FH does the can mount?
ETA: just measured clearance between the rail end and the shoulder for the FH. You have .054 inch clearance....not a whole lot DJs pic above pretty much looks exactly like how my Specwar K fits. |
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Posted: 10/8/2015 2:57:53 PM EDT
[#3]
thanks guys that exactly what i needed to know. will measure mine when i get home. DSG states the DD FH is spec to fit the can but adding an a2 is not a problem if needed.
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Posted: 10/8/2015 5:52:07 PM EDT
[#4]
Something else to contemplate with the commercial MK18 DD uppers is that they're heavily over gassed, even without a can.
You might want to look at a govnah for it as well. That aside, I love my DD MK18 upper. |
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Posted: 10/8/2015 10:43:15 PM EDT
[#5]
Quote HistoryQuoted:
Something else to contemplate with the commercial MK18 DD uppers is that they're heavily over gassed, even without a can. You might want to look at a govnah for it as well. That aside, I love my DD MK18 upper. Installed my Govnah over the summer. Need to sight in my T1 as using this for s carbine class in 2 wks. |
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Posted: 10/9/2015 10:43:14 AM EDT
[#6]
i'd rather not spend another 100 for a gas block. you guys running heavy buffers?
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Posted: 10/9/2015 10:57:04 AM EDT
[#7]
Quote HistoryQuoted:
i'd rather not spend another 100 for a gas block. you guys running heavy buffers? I have a colt barrel on mine and run an H buffer, but I would start with an H2 on the DD barrel and go up |
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Posted: 10/9/2015 11:31:12 AM EDT
[#8]
I just received the gemtech BCG, I won't have my suppressor until next month to test it out. I've got some great info from people in the industry that it works as described.
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Posted: 10/9/2015 11:32:46 AM EDT
[#9]
Quote HistoryQuoted:
i'd rather not spend another 100 for a gas block. you guys running heavy buffers? MK18 SBR comes with an H buffer stock. I'm running an H2 myself, but I don't run a can on it. It is heavily overgassed, with a can you're going to get substantial gas to the face. |
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Posted: 10/9/2015 11:39:29 AM EDT
[#10]
i have a radical arms pistol that does the same thing. added a Armageddon Tactical CH and it made a HUGE difference. i would expect this on any short upper. that gas has to go somewhere
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Posted: 10/9/2015 1:52:17 PM EDT
[#11]
Quote HistoryQuoted:
i have a radical arms pistol that does the same thing. added a Armageddon Tactical CH and it made a HUGE difference. i would expect this on any short upper. that gas has to go somewhere No. A properly sized gas port elevates excess gas to the face and carrier wear. I have a 10.3" DD contract over run barrel that has a smaller .70 gas port compared to a commercial 10.3" DD barrel with an .80+ gas port. They're night and day. |
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Posted: 10/9/2015 7:26:47 PM EDT
[#12]
Quote HistoryQuoted:
MK18 SBR comes with an H buffer stock. I'm running an H2 myself, but I don't run a can on it. It is heavily overgassed, with a can you're going to get substantial gas to the face. Quote HistoryQuoted:
Quoted:
i'd rather not spend another 100 for a gas block. you guys running heavy buffers? MK18 SBR comes with an H buffer stock. I'm running an H2 myself, but I don't run a can on it. It is heavily overgassed, with a can you're going to get substantial gas to the face. I believe the MK18 guys in the big AR thread say H3 and springco Blue. |
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Posted: 10/12/2015 12:57:48 PM EDT
[#13]
Quote HistoryQuoted:
i'd rather not spend another 100 for a gas block. you guys running heavy buffers? I have the full DD Mk18, not just the upper, so I'm running the stock buffer with the new gas block. 556SD on the end. |
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Posted: 10/12/2015 1:14:38 PM EDT
[#14]
Quote HistoryQuoted: I believe the MK18 guys in the big AR thread say H3 and springco Blue. Quote HistoryQuoted: Quoted: Quoted: i'd rather not spend another 100 for a gas block. you guys running heavy buffers? MK18 SBR comes with an H buffer stock. I'm running an H2 myself, but I don't run a can on it. It is heavily overgassed, with a can you're going to get substantial gas to the face. I believe the MK18 guys in the big AR thread say H3 and springco Blue. .081~.082 Factory DD port size LC M855 H3 buffer and Red Sprinco spring (The Red spring is even stronger than the Blue) Unsuppressed 756 RPM Suppressed 1046 RPM 290 RPM difference in cyclic rate Old video shows .070 Port LC M855 H2 buffer standard power (White) Sprinco Spring Unsuppressed 830 RPM Suppressed 1024 RPM (Notice lower than using the H3 buffer and Red Spring...but I was using a .070 Milspec port size not the .081~.082 port size) 194 RPM difference in cyclic rate .049 Port Suppressed 726 RPM  |
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