Oly-specific parts for K9 ??

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Oly-specific parts for K9 ??

Postby JCS » Fri Feb 17, 2017 6:55 pm

I have a 9mm Oly AR-15 - I think it's a K9 model (bought it used) - I've read that some AR components from other AR-15s might not work on Oly's 9mm platform - if I understand things correctly, the Oly lower hosting my Oly 9mm upper is just like any other AR-15 lower, but some of the components of the Oly 9mm upper are specific to Oly's implementation of a 9mm AR-15. If that's correct, what parts \ components should I buy now (from Oly) with Oly going out of business? THANKS!
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Re: Oly-specific parts for K9 ??

Postby Thom » Fri Feb 17, 2017 9:19 pm

The Oly 9mm upper will work with any standard lower, but because the ejector is mounted in the upper, it may not be compatible with some manufactures 9mm lowers that use a lower mounted ejector.
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Re: Oly-specific parts for K9 ??

Postby Globemaster » Fri Feb 17, 2017 10:16 pm

JCS wrote: what parts \ components should I buy now (from Oly) with Oly going out of business? THANKS!


if I still had a K9 ... I'd be ordering up these parts

PC28 Pistol cal, ejector spring assembly $14.30


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Re: Oly-specific parts for K9 ??

Postby JCS » Sat Feb 18, 2017 5:34 am

Thanks very much ! Besides the PC28, are there any other parts unique to or specific to the Oly 9mm upper ??

BTW, the three Oly 9mm AR-15 mags I ordered are on the way - then I'll have 6 - so I'll be in good shape on mags and less interested in the magwell block.
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Re: Oly-specific parts for K9 ??

Postby Globemaster » Sat Feb 18, 2017 8:45 am

cool ... and yes, the bolt carrier group and/or bolt face would be another part that I'd order up
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Re: Oly-specific parts for K9 ??

Postby JCS » Sun Feb 19, 2017 5:10 am

Thanks very much - I'd hate to have a part fail and have a useless gun if those Oly-specific parts aren't available down the road - I bought two PC28s - and I'm also gonna order the BCG and bolt face - much appreciated.
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Re: Oly-specific parts for K9 ??

Postby Globemaster » Sun Feb 19, 2017 9:48 am

yup, the only thing I ordered from Olympic Arms wa a BCG for a 25WSSM, as the others are just standard/basic models
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Re: Oly-specific parts for K9 ??

Postby Caradepau » Thu Feb 23, 2017 6:57 am

Hello all.

I have a K9-GL1 (glock lower). My favorite AR.

The Oly 9mm uppers, the barrels are 415 stainless I think. Does anyone know for sure?

Any estimates of how many rounds shot through the barrel until it's shot out (when using plain, non "hot" ammo like +P+)?

Does the Oly 9mm upper used in the "non glock" lower Oly 9mm ARs, like the K9 or K9-FT rifles (the rifles that uses the Oly propitiatory mags, not glock mags) will work on the Oly glock lower?

I know the Oly glock lower BCG is different than normal AR 15 and Oly pistol AR's that use the Oly mags; they need groves cut into the carrier to clear the glock magazine (something similar to that).

I'm wondering if the Oly glock BCG will work in any Oly 9mm upper (whether it's an Oly glock 9mm upper or Oly magazine upper).

Is the bolt the same though, used in the 9mm "glock" BCG vs the Oly 9mm BCG?
Me thinks maybe yes, only the carrier is different (the cut groves for the glock mag)?

Any feedback, most welcome.
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Re: Oly-specific parts for K9 ??

Postby Globemaster » Thu Feb 23, 2017 6:06 pm

Caradepau wrote: I have a K9-GL1 (glock lower). My favorite AR.

cool … I’ve shot that model a few times at the OA’s Day at the Range events, in the past

Caradepau wrote: The Oly 9mm uppers, the barrels are 415 stainless I think. Does anyone know for sure?

my K9 had a SS barrel …

Caradepau wrote: Any estimates of how many rounds shot through the barrel until it's shot out (when using plain, non "hot" ammo like +P+)?

I have no idea …

Caradepau wrote: Does the Oly 9mm upper used in the "non glock" lower Oly 9mm ARs, like the K9 or K9-FT rifles (the rifles that uses the Oly propitiatory mags, not glock mags) will work on the Oly glock lower?

I don’t think so … IIRC, it’s been asked a few times in the past.

Caradepau wrote: I know the Oly glock lower BCG is different than normal AR 15 and Oly pistol AR's that use the Oly mags; they need groves cut into the carrier to clear the glock magazine (something similar to that).

this was my K9 …

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Caradepau wrote: I'm wondering if the Oly glock BCG will work in any Oly 9mm upper (whether it's an Oly glock 9mm upper or Oly magazine upper).

I don’t know that either, as I’ve never compared them ‘side by side’ … that’s a good question for the guys at Oly-Arms, I’d give them a call before the doors close.

Caradepau wrote: Is the bolt the same though, used in the 9mm "glock" BCG vs the Oly 9mm BCG?
Me thinks maybe yes, only the carrier is different (the cut groves for the glock mag)?

That could be ,,, another good question for them …

Caradepau wrote: Any feedback, most welcome.

I tried my best … I hope some of it helps.
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Re: Oly-specific parts for K9 ??

Postby Caradepau » Mon Feb 27, 2017 7:57 am

From what I learned when chatting with Oly guy on 2-24-17:

The BCG for the Oly 9mm glock lower and Oly 9mm proprietary magazine lower, both BCG and bolts are identical.
So, both uppers are identical too.

My guess, you'd be able to use the Oly 9mm BCG with a 3rd party 9mm glock lower like from quarter circle too.

One thing to be aware of would be that Oly has the last round/bolt hold open technology others do not utilize; it's incorporated within the upper, not the lower,yes yes? Others use that tech in the lower's I think. Or visa versa. Not too sure.

You'd have to remove one of them to ensure nothing jams up if choosing to use a 3rd party glock lower or upper receiver with some of your other Oly parts.

Some other info:
Any 3rd party 9mm AR barrel should work. The Oly 9mm barrels have a removable collar so to speak, which is the feed ramps. Without it, a 3rd party barrel would not work. You'd need to remove the one on your existing Oly 9mm barrel to install on the 3rd party barrel.
The Oly guy said it unscrews from the Oly barrel (like a flash / muzzel device does).

So with that said, I'm assuming all 9mm AR barrels have a threaded end where they couple into the upper receiver, yes yes? (I've never built an AR from scratch so I really do not know).
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Re: Oly-specific parts for K9 ??

Postby Caradepau » Tue Feb 28, 2017 6:08 am

I looked at my BCG of my Oly glock 9mm last night again. I compared it to my other 9mm upper that uses a CMMG BCG (which are very weird looking), a Yankee Hill 9mm upper.

The Oly bolt is tapered. The CMMG "bolt" is flat.

Caradepau wrote:My guess, you'd be able to use the Oly 9mm BCG with a 3rd party 9mm glock lower like from quarter circle too.


I was hoping an Oly 9mm (or 10mm) BCG would work in a 3rd party glock lower. This is NOT the case, it cannot. The only way it could is if you use the Oly complete upper (you'd then have that required "cone collar" that fits onto the end of the barrel which mates to the Oly bolt cone shaped bolt head).

Oly 9mm or 10mm (I have both), most probably 40 cal, 45 cal would not work with other pistol cal uppers (visa versa). Mainly due to the cone shape of the Oly bolt.

The Oly bolt carrier does slide into any standard AR upper but it really cannot come into battery. It will not fit properly against the "normal" barrel setup of other 9mm uppers.

I truly hope the Oly transition keeps these pistol cal designs for years to come.. Hoping they adapt a 10mm glock lower too.
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Re: Oly-specific parts for K9 ??

Postby Rattler » Tue Mar 07, 2017 11:40 am

O know guys that use the Oly 9 and 40 uppers on Quarter Circle Ten lowers and they work well. You'll need to remove the ejector from the lower, but that's the only mod.
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