Cannot Solve Gas Problems...

[kmc0929]

DD MK18 Rifle 10.3 BBL W/AAC M4-2000 (Brakeout FH)

At this point I have tried just about everything however this gun produces an exceptional amount blowback...

H3 Buffer
GEMTECH Suppressed Bolt Carrier
Superlative Arms Adjustable Gas Block
PRI Gasbuster Charging Handle

At this point I am wondering if I have too much shit added into this mix?

I reduced the amount of gas making it into the system via the AGB and the only way to remove the bulk of the blowback ALSO causes the rifle not to operate properly (won't cycle).

Tried to video this the best possible, see link(s) below...

https://www.youtube.com/watch?v=VCl-aTVq8as
https://www.youtube.com/watch?v=i80ljmOTDFE
https://www.youtube.com/watch?v=_lc4UArrPNY

[GSMullins]

You could try an AR gas vent, which is a forward assist with a large vent hole milled in the side for gas to escape. Available from several vendors. No personal experience, but it seems like a reasonable solution.

[markm]

Some combos are just gassy as fugg! The M4-2000 was built on the db reduction mentality design... which means trapping more gas.

Is there anyone around you with a 7.62 AAC can you could try?

[bruin]

Is there a reason you're using the Gemtech SBC when you have an adjustable gas block? You could try a different enhanced carrier that bleeds off gas more efficiently ( i.e. LMT, Lantac).

Another idea is to try the Vltor A5 with a heavier buffer, ideally with an LMT E-carrier. Better dwell time should cut down on the gas coming back into the upper from the chamber. Reduced cyclic rate should improve the reliability of the firearm overall.

Sent from my ZTE A2017U using Tapatalk

[georgeib]

Alternately, you could try a less gassy suppressor such as an OSS.

[vicious_cb]

DD MK18 Rifle 10.3 BBL W/AAC M4-2000 (Brakeout FH)

At this point I have tried just about everything however this gun produces an exceptional amount blowback...

H3 Buffer
GEMTECH Suppressed Bolt Carrier
Superlative Arms Adjustable Gas Block
PRI Gasbuster Charging Handle

At this point I am wondering if I have too much shit added into this mix?

I reduced the amount of gas making it into the system via the AGB and the only way to remove the bulk of the blowback ALSO causes the rifle not to operate properly (won't cycle).

Tried to video this the best possible, see link(s) below...

https://www.youtube.com/watch?v=VCl-aTVq8as
https://www.youtube.com/watch?v=i80ljmOTDFE
https://www.youtube.com/watch?v=_lc4UArrPNY

Have you tried contacting DD to send them back their garbage overgassed barrel?

[markm]

Have you tried contacting DD to send them back their garbage overgassed barrel?

That was my thought, but he's already choking it down with an AGB.

[Iraqgunz]

If I were to guess, I would say yes. If DD doesn't replace the barrel like they have allegedly for others, then I would contact Clint at Black River Tactical and get one of his insertable ports.


DD MK18 Rifle 10.3 BBL W/AAC M4-2000 (Brakeout FH)

At this point I have tried just about everything however this gun produces an exceptional amount blowback...

H3 Buffer
GEMTECH Suppressed Bolt Carrier
Superlative Arms Adjustable Gas Block
PRI Gasbuster Charging Handle

At this point I am wondering if I have too much shit added into this mix?

I reduced the amount of gas making it into the system via the AGB and the only way to remove the bulk of the blowback ALSO causes the rifle not to operate properly (won't cycle).

Tried to video this the best possible, see link(s) below...

https://www.youtube.com/watch?v=VCl-aTVq8as
https://www.youtube.com/watch?v=i80ljmOTDFE
https://www.youtube.com/watch?v=_lc4UArrPNY

[vicious_cb]

The fact of matter is, with the AR-15, you can fix 90% of the issues by drilling the right sized hole.

I also love how an entire side market of the industry is entirely devoted to fixing said wrong sized hole problem. Its genius really, Im gonna f*** up drilling this hole so I can invent adjustable gas blocks, special bolt carriers, threaded inserts, gas vents, special charging handles, RED springs to mitigate the issue.

[Grip]

The fact of matter is, with the AR-15, you can fix 90% of the issues by drilling the right sized hole.

I also love how an entire side market of the industry is entirely devoted to fixing said wrong sized hole problem. Its genius really, Im gonna f*** up drilling this hole so I can invent adjustable gas blocks, special bolt carriers, threaded inserts, gas vents, special charging handles, RED springs to mitigate the issue.

Care to tell me what the proper size hole should be for a 13.7" mid gas 5.56 barrel? Apparently this is a huge mystery that cannot be answered.

[1168]

The fact of matter is, with the AR-15, you can fix 90% of the issues by drilling the right sized hole.

I also love how an entire side market of the industry is entirely devoted to fixing said wrong sized hole problem. Its genius really, Im gonna f*** up drilling this hole so I can invent adjustable gas blocks, special bolt carriers, threaded inserts, gas vents, special charging handles, RED springs to mitigate the issue.

While I mostly agree, the OP is shooting a 10.5 with a gassy can. There may not be a single “right sized hole” that can cover all bases perfectly. What size port would you choose if you were selling a 10.5” barrel that users might try to use with Wolf unsuppressed or 855a1 suppressed?

Sionics is onto something.

[jpmuscle]

OP.

Get a 060 port from Clint and go from there. Ditch the Gemtech and adjustable GB and start over.


Sent from my iPhone using Tapatalk

[markm]

The fact of matter is, with the AR-15, you can fix 90% of the issues by drilling the right sized hole.

I also love how an entire side market of the industry is entirely devoted to fixing said wrong sized hole problem. Its genius really, Im gonna f*** up drilling this hole so I can invent adjustable gas blocks, special bolt carriers, threaded inserts, gas vents, special charging handles, RED springs to mitigate the issue.

Preach it, Brother!

[markm]

Care to tell me what the proper size hole should be for a 13.7" mid gas 5.56 barrel? Apparently this is a huge mystery that cannot be answered.

.080" should work. .076" runs on the 14.5", so I'd bet .080-.081" should do the trick.

[kwg020]

Alternately, you could try a less gassy suppressor such as an OSS.

Short barrel with a can. This is my SWAG.
kwg