Oly 9mm upper?

Discussions on the Pistol Caliber AR15

Moderator: Charlie-2-6

Oly 9mm upper?

Postby KMS1160 » Sun Aug 07, 2011 8:46 am

Found this 9mm upper a buddy of mine has, he picked up another and I might be getting this one. I brought my Stop Sign Carbine over, the upper went right on. I noticed the the barrel length and flash hider are exactly the same as my Stop Sign, but he says the upper is a Colt.

How can I tell if this is an Oly upper?

The carry handle sight is an A2, btw.

Would be cool as h*ll if it was an Oly upper!


The mags are modifed Uzi, with an adapter.
KMS1160
Sharpshooter
Sharpshooter
 
Posts: 245
Joined: Fri Aug 13, 2010 8:25 am
Location: Eastern WA

Re: Oly 9mm upper?

Postby John A. » Sun Aug 07, 2011 9:44 am

The Olympic and Colt bolt and ejectors are vastly different from each other.

If your stop sign lower is using a collapsible stock on it, you'll also very likely need to get a heavier buffer (H2 or H3).

Maybe some KNS anti rotational pins too so the hammer hole doesn't egg out prematurely especially if the bolt isn't ramped, and for sure a flat face hammer if the one you have isn't a straight 90 degree angle where it strikes the firing pin.

some mag blocks use uzi mags, some sten mags, some various other style modified mags.
Yes, I'm "THAT" guy
User avatar
John A.
OA2 Advisory Council
OA2 Advisory Council
 
Posts: 7548
Joined: Tue Sep 09, 2003 7:51 pm
Location: If I don't want to be found, I won't be

Re: Oly 9mm upper?

Postby Globemaster » Sun Aug 07, 2011 9:52 am

KMS1160 wrote: Found this 9mm upper a buddy of mine has, he picked up another and I might be getting this one.

sounds good

KMS1160 wrote: I brought my Stop Sign Carbine over, the upper went right on.

mating other brands® of ‘uppers & lowers’ has never been an issue for me; and I’ve yet to have any issues; with any other bands® mating them to an Olympic Arms®

KMS1160 wrote: I noticed that the barrel length and flash hider are exactly the same as my Stop Sign, but he says the upper is a Colt.

it might be?

KMS1160 wrote: How can I tell if this is an Oly upper?

Olympic Arms® uses this “Espring” system … if it’s a Colt® you will need a different hammer; as the OA® Pistol caliber carbines; use any standard AR15 lower receiver

Image

Image

Image

Image

KMS1160 wrote: The carry handle sight is an A2, btw.

ok

KMS1160 wrote: Would be cool as h*ll if it was an Oly upper!

if it’s an OA® … the barrel will be marked ‘SS 9mm’ just forward of the gas block, or FSB.

KMS1160 wrote: The mags are modifed Uzi, with an adapter.

9mm OA® Pistol caliber carbines; use STEN mags, not Uzi … although the Oly-Arms® 45ACP Pistol caliber, does use the Uzi mags.



here’s an OA2.org web-link to my OA® 9mm Project
The Nonsense Stops! … When The Hammer Drops!
Image
User avatar
Globemaster
OA2 Staff - AC/TEAM MEMBER
OA2 Staff - AC/TEAM MEMBER
 
Posts: 20828
Joined: Wed Dec 28, 2005 4:42 pm
Location: Socialist Republic of Washington State

Re: Oly 9mm upper?

Postby Rattler » Mon Aug 08, 2011 8:35 am

Good post, GM.
"A toast? Yeah. To high treason... So - Here's to the men who did what was considered wrong, in order to do what they knew was right. What they knew was right."
Nicholas Cage as Ben Gates: National Treasure
User avatar
Rattler
OA2 PRESIDENT
OA2 PRESIDENT
 
Posts: 11819
Joined: Thu Oct 21, 2010 2:19 pm
Location: T9O, WA

Re: Oly 9mm upper?

Postby Globemaster » Mon Aug 08, 2011 9:01 am

thanks ... and I moved this thread to the 'Pistol Caliber AR15's Room' :mrgreen:
The Nonsense Stops! … When The Hammer Drops!
Image
User avatar
Globemaster
OA2 Staff - AC/TEAM MEMBER
OA2 Staff - AC/TEAM MEMBER
 
Posts: 20828
Joined: Wed Dec 28, 2005 4:42 pm
Location: Socialist Republic of Washington State

Re: Oly 9mm upper?

Postby Globemaster » Mon Aug 08, 2011 2:07 pm

KMS1160 wrote: an adapter

with this OA® Polymer magazine; you wouldn’t need an adapter.

Image

Image

Image

Image

Image

Image

Image

Image
The Nonsense Stops! … When The Hammer Drops!
Image
User avatar
Globemaster
OA2 Staff - AC/TEAM MEMBER
OA2 Staff - AC/TEAM MEMBER
 
Posts: 20828
Joined: Wed Dec 28, 2005 4:42 pm
Location: Socialist Republic of Washington State

Re: Oly 9mm upper?

Postby John A. » Mon Aug 08, 2011 3:02 pm

Those mags aren't compatible with the RRA/COLT design are they?
Yes, I'm "THAT" guy
User avatar
John A.
OA2 Advisory Council
OA2 Advisory Council
 
Posts: 7548
Joined: Tue Sep 09, 2003 7:51 pm
Location: If I don't want to be found, I won't be

Re: Oly 9mm upper?

Postby Globemaster » Mon Aug 08, 2011 3:20 pm

that's a good question John; and one that I do not know? I was just offering up the info on the OA® Polyomer 9mm magazine; just in case this upper ends up being an Olympic Arms® product? maybe Rattler or Ductapeman knows if they’re compatible with the other manufactures or not? but I kind of doubt that they are?
The Nonsense Stops! … When The Hammer Drops!
Image
User avatar
Globemaster
OA2 Staff - AC/TEAM MEMBER
OA2 Staff - AC/TEAM MEMBER
 
Posts: 20828
Joined: Wed Dec 28, 2005 4:42 pm
Location: Socialist Republic of Washington State

Re: Oly 9mm upper?

Postby Rattler » Tue Aug 09, 2011 8:26 am

John A. wrote:Those mags aren't compatible with the RRA/COLT design are they?



No. Nor are they compatible with any aftermarket 9mm conversion. They are designed to work with the Oly 9mm conversion only. And remember, if it is not an Olympic Arms 9mm upper, it is an aftermarket unit- as Olympic invented the 9mm conversion for the AR15.
"A toast? Yeah. To high treason... So - Here's to the men who did what was considered wrong, in order to do what they knew was right. What they knew was right."
Nicholas Cage as Ben Gates: National Treasure
User avatar
Rattler
OA2 PRESIDENT
OA2 PRESIDENT
 
Posts: 11819
Joined: Thu Oct 21, 2010 2:19 pm
Location: T9O, WA


Return to Pistol Caliber AR15's

Who is online

Users browsing this forum: No registered users and 1 guest