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Mk 18 / CQBR (Page 1441 of 1441)
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Link Posted: Yesterday 3:37:04 PM EDT
[Last Edit: Yesterday 11:11:53 PM EDT by Dyzastr]
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Originally Posted By Air_Soft_Contractor:
In this Coast Guard pic you can see the GG&G rear sight with logo.

https://www.americanspecialops.com/images/photos/coast-guard/msst-lefp-hr.jpg

Another pic with what I think is a GG&G rear sight and a GG&G optic mount.

https://upload.wikimedia.org/wikipedia/commons/4/4c/USCG_MSRT.JPG
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Gg&g rear sights have definitely been documented a decent amount of times. Even the gg&g rail (1201) has been spotted itw a couple times.

Eta- my old colt bolt carrier almost looks like a chrome carrier.
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Link Posted: Yesterday 7:24:09 PM EDT
[Last Edit: Yesterday 7:25:06 PM EDT by hatexoc]
Taking a 3 day class next weekend, going to be running the bottom mk18pr-ish rifle with the cqbr as back up.
I can’t exactly point out why but the mk18 has become my go to for everything.
https://ibb.co/D5h310d

Link Posted: Yesterday 9:00:21 PM EDT
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Originally Posted By UndrGrndPrdcts:

That chop saw tho.
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Dude is literally carrying a chop saw backup.
Link Posted: Yesterday 9:03:57 PM EDT
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Originally Posted By UndrGrndPrdcts:
That chop saw tho.
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yeah, carbon fiber chop-saw.  wow.  probably not Harbor Freight.
Link Posted: Yesterday 9:07:28 PM EDT
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Originally Posted By rpoL98:

yeah, carbon fiber chop-saw.  wow.  probably not Harbor Freight.
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Originally Posted By rpoL98:
Originally Posted By UndrGrndPrdcts:
That chop saw tho.

yeah, carbon fiber chop-saw.  wow.  probably not Harbor Freight.


Clone correct chop saw anybody?
Link Posted: Yesterday 9:20:29 PM EDT
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Originally Posted By Air_Soft_Contractor:


Clone correct chop saw anybody?
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Looks like a spray painted Husqvarna K760
Link Posted: Yesterday 9:26:10 PM EDT
Link Posted: Yesterday 9:31:39 PM EDT
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Originally Posted By pezboytate:
To those of you that are hesitant to buy the auto selector because it's auto.

Using a full auto selector in a semi auto AR15:

If you have a semi auto trigger and semi auto disconnector and don't remove the nub from the auto selector, it will be safe semi safe.

If you have a full auto trigger and semi auto disconnector and don't remove the nub from the auto selector, it will be safe semi semi.

If you have a full auto trigger and full auto disconnector and don't remove the nub, it will be safe semi hammer follow. Depending on timing, this could result in multiple shots being fired. It's probably not a good idea to use this combo.

If you have any trigger and any disconnector and remove the nub from the auto selector, it will be safe semi semi.

If your AR15 doesn't have selector stops, the selector will be able to travel past safe while rotating counter clockwise and will be able to travel past auto when rotating clockwise.

Function check it after you install it. Make sure it goes from semi to safe with the bolt forward and locked to the rear.
View Quote

And if you've got a 2-stage w/ auto safety, it will be safe, semi, semi. Not exactly Mk18 related, but there's some crossover from the Mk12/Mod H crowd.
Link Posted: Yesterday 11:30:25 PM EDT
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Originally Posted By SecretSquirell:

And if you've got a 2-stage w/ auto safety, it will be safe, semi, semi. Not exactly Mk18 related, but there's some crossover from the Mk12/Mod H crowd.
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Originally Posted By SecretSquirell:
Originally Posted By pezboytate:
To those of you that are hesitant to buy the auto selector because it's auto.

Using a full auto selector in a semi auto AR15:

If you have a semi auto trigger and semi auto disconnector and don't remove the nub from the auto selector, it will be safe semi safe.

If you have a full auto trigger and semi auto disconnector and don't remove the nub from the auto selector, it will be safe semi semi.

If you have a full auto trigger and full auto disconnector and don't remove the nub, it will be safe semi hammer follow. Depending on timing, this could result in multiple shots being fired. It's probably not a good idea to use this combo.

If you have any trigger and any disconnector and remove the nub from the auto selector, it will be safe semi semi.

If your AR15 doesn't have selector stops, the selector will be able to travel past safe while rotating counter clockwise and will be able to travel past auto when rotating clockwise.

Function check it after you install it. Make sure it goes from semi to safe with the bolt forward and locked to the rear.

And if you've got a 2-stage w/ auto safety, it will be safe, semi, semi. Not exactly Mk18 related, but there's some crossover from the Mk12/Mod H crowd.


Yes. The SSA will function like the auto trigger, semi disconnector and the SSF will function like the auto trigger, auto disconnector. I think it's the same for the KAC ones.
Link Posted: Today 12:49:08 AM EDT
Here's some MK18s to muddy the waters

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Link Posted: Today 1:10:45 AM EDT
Link Posted: Today 1:16:17 AM EDT
[Last Edit: Today 1:16:26 AM EDT by LsuJon]
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Originally Posted By kmcale:

Psst.. barrel too long
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Psst... peak the lower
Link Posted: Today 1:18:01 AM EDT
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Originally Posted By LsuJon:
Psst... peak the lower
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"Muddy the waters" makes sense now
Link Posted: Today 2:56:22 AM EDT
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Originally Posted By pezboytate:
To those of you that are hesitant to buy the auto selector because it's auto.

Using a full auto selector in a semi auto AR15:

If you have a semi auto trigger and semi auto disconnector and don't remove the nub from the auto selector, it will be safe semi safe.

If you have a full auto trigger and semi auto disconnector and don't remove the nub from the auto selector, it will be safe semi semi.

If you have a full auto trigger and full auto disconnector and don't remove the nub, it will be safe semi hammer follow. Depending on timing, this could result in multiple shots being fired. It's probably not a good idea to use this combo.

If you have any trigger and any disconnector and remove the nub from the auto selector, it will be safe semi semi.

If your AR15 doesn't have selector stops, the selector will be able to travel past safe while rotating counter clockwise and will be able to travel past auto when rotating clockwise.

Function check it after you install it. Make sure it goes from semi to safe with the bolt forward and locked to the rear.
View Quote View All Quotes
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Discussion ForumsJump to Quoted PostQuote History
Originally Posted By pezboytate:
To those of you that are hesitant to buy the auto selector because it's auto.

Using a full auto selector in a semi auto AR15:

If you have a semi auto trigger and semi auto disconnector and don't remove the nub from the auto selector, it will be safe semi safe.

If you have a full auto trigger and semi auto disconnector and don't remove the nub from the auto selector, it will be safe semi semi.

If you have a full auto trigger and full auto disconnector and don't remove the nub, it will be safe semi hammer follow. Depending on timing, this could result in multiple shots being fired. It's probably not a good idea to use this combo.

If you have any trigger and any disconnector and remove the nub from the auto selector, it will be safe semi semi.

If your AR15 doesn't have selector stops, the selector will be able to travel past safe while rotating counter clockwise and will be able to travel past auto when rotating clockwise.

Function check it after you install it. Make sure it goes from semi to safe with the bolt forward and locked to the rear.


Originally Posted By pezboytate:


Yes. The SSA will function like the auto trigger, semi disconnector and the SSF will function like the auto trigger, auto disconnector. I think it's the same for the KAC ones.


Originally Posted By SecretSquirell:

And if you've got a 2-stage w/ auto safety, it will be safe, semi, semi. Not exactly Mk18 related, but there's some crossover from the Mk12/Mod H crowd.

I remember a while back the Army and TACOM issued a safety bulletin regarding the safeties on M16 and M4 series. Do we need to worry about this if we have a FA ambi safety, but using them on a SA lower and trigger?
I have a semi auto lower, completed from 80%, Geissele SSA(maybe SSA-E?) trigger, and Colt cage code FA ambi safety from Brownells. It seems to fail at #3 below, but if I pull the trigger 3 times then the hammer drops on the 3rd pull. It doesn't fail at #4 though.

The TACOM function check (source):

  1.    Ensure weapon is clear by observing the chamber, the bolt face, and magazine well. The weapon should always be pointed in a safe direction.[/li]
  2.   Charge the weapon, place selector lever on the safe position and pull trigger. The hammer should not drop.

  3.    Move the selector lever to the semi position, then move the selector to a position between semi and auto, and squeeze the trigger. The hammer should drop when the trigger is squeezed. If the hammer does not drop when the trigger is squeezed, this is a failure. Record this information and continue to the next step.

  4.    If the hammer does not drop, move the selector in either direction. If the hammer drops without squeezing the trigger, this is a failure. Record this information.

  5.    Gather information recorded from failures at steps (3) and (4) and segregate the weapon for further investigation. Contact TACOM with the weapon serial number.

  6.    If the weapon passes steps (3) and (4), the function check is complete.


Link Posted: Today 3:25:29 AM EDT
Link Posted: Today 3:51:16 AM EDT
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Originally Posted By MILSPEC556:

@USNGUNS mentioned this years back. The original Mod 0's were converted to 14.5 M4A1's
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Yup! Figured it's been awhile so I brought it back up . It's actually pretty easy to find the photos to w/ a quick google. Those were just two examples out of many.
Link Posted: Today 8:07:20 AM EDT
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Originally Posted By tnbigdawg:





I remember a while back the Army and TACOM issued a safety bulletin regarding the safeties on M16 and M4 series. Do we need to worry about this if we have a FA ambi safety, but using them on a SA lower and trigger?
I have a semi auto lower, completed from 80%, Geissele SSA(maybe SSA-E?) trigger, and Colt cage code FA ambi safety from Brownells. It seems to fail at #3 below, but if I pull the trigger 3 times then the hammer drops on the 3rd pull. It doesn't fail at #4 though.

The TACOM function check (source):

  1.    Ensure weapon is clear by observing the chamber, the bolt face, and magazine well. The weapon should always be pointed in a safe direction.[/li]
  2.   Charge the weapon, place selector lever on the safe position and pull trigger. The hammer should not drop.

  3.    Move the selector lever to the semi position, then move the selector to a position between semi and auto, and squeeze the trigger. The hammer should drop when the trigger is squeezed. If the hammer does not drop when the trigger is squeezed, this is a failure. Record this information and continue to the next step.

  4.    If the hammer does not drop, move the selector in either direction. If the hammer drops without squeezing the trigger, this is a failure. Record this information.

  5.    Gather information recorded from failures at steps (3) and (4) and segregate the weapon for further investigation. Contact TACOM with the weapon serial number.

  6.    If the weapon passes steps (3) and (4), the function check is complete.


View Quote


I don't think that applies with any semi parts. However, you are using an 80% lower so you want to really ensure your selector hole and trigger pin hole are in the correct location and that your safety is working properly.
Link Posted: Today 8:08:06 AM EDT
Link Posted: Today 9:19:33 AM EDT
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Originally Posted By pezboytate:


That rear sight position
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It looks like that might be due to the stock not being extended.
Link Posted: Today 10:47:11 AM EDT
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Originally Posted By MILSPEC556:

@USNGUNS mentioned this years back. The original Mod 0’s were converted to 14.5 M4A1’s
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Originally Posted By MILSPEC556:

@USNGUNS mentioned this years back. The original Mod 0’s were converted to 14.5 M4A1’s

Yeah, I posted about it back in 2015.  If the waters are muddy again, some time in 2008 or so, Crane directed all ships to requisition M4A1 uppers and ship back the 10.3 uppers.  We retained the Aimpoints and Surefires and installed them on the new uppers.  At that time, there was no formal armorer training that covered the mounting of optics and accessories for shipboard personnel...probably why photos exist of improperly mounted gear.

Some of the old Mk18 lowers are still on ships as of 2021.


Link Posted: Today 11:57:50 AM EDT
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Originally Posted By usnguns:

Yeah, I posted about it back in 2015.  If the waters are muddy again, some time in 2008 or so, Crane directed all ships to requisition M4A1 uppers and ship back the 10.3 uppers.  We retained the Aimpoints and Surefires and installed them on the new uppers.  At that time, there was no formal armorer training that covered the mounting of optics and accessories for shipboard personnel...probably why photos exist of improperly mounted gear.

Some of the old Mk18 lowers are still on ships as of 2021.

https://i.imgur.com/ckQEQGP.jpg
https://i.imgur.com/8n7Mm9o.jpg
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Can you comment anything about when and why the strike through "18-1" lowers came about?
Link Posted: Today 12:09:18 PM EDT
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Originally Posted By LsuJon:
Can you comment anything about when and why the strike through "18-1" lowers came about?
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That's not related to those. The 18-1 thing is in NSW.
Link Posted: Today 12:13:52 PM EDT
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Originally Posted By LsuJon:
Can you comment anything about when and why the strike through "18-1" lowers came about?
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I was told by a NSW armorer from the west coast that they started that in 2015 before they deployed to Kuwait/Iraq where I was at during that time.  These were tracked as Mk 18 Mod 1's on property books and M4A1s were standard guns.  Again just a way to track property.

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