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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 08-25-2011, 8:33 AM
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Default 9mm AR Build Components

I might be interested in building a 9mm AR but I need some details...
How much will it cost to build a basic 9mm AR?
What are the main components/parts needed to complete a 9mm AR? Or from a standard AR-15, what needs to be swapped/changed?
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  #2  
Old 08-25-2011, 8:35 AM
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Upper, Bolt, Magazine, Magazine Well Adapter (w/ejector), and hammer (on most conversions).

That's it.
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Old 08-25-2011, 8:42 AM
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Oh, and maybe the buffer too, but when I had mine, I simply used the rifle, carbine buffer and spring.
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Old 08-25-2011, 8:44 AM
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http://www.rockriverarms.com/index.c...ategory_id=236
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  #5  
Old 08-25-2011, 8:58 AM
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Ar15.com has a rimfire and pistol caliber section with a 9mm FAQ.
http://www.ar15.com/forums/t_3_15/10...mm_AR_FAQ.html
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Old 08-25-2011, 11:12 AM
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The only parts that are shared in the typical 9mm build are the:
Lower reciever
Upper reciever(unless you get a dedicated 9mm upper)
round hammer LPK(only if you get a ramped 9mm bolt. Otherwise a dedicated 9mm hammer)
Stock and buffer tube(you will still need a spacer at the very least so your carrier doesn't overtravel on the rebound stroke and heavier buffer is suggested)

A 9mm build will cost more than a 223/556 build. You will need at the very least assuming you have a complete lower and stripped upper.
Barrel
bolt/carrier
magwell adapter unless you get a dedicated 9mm lower
buffer spacer(some people have been known to use quarters) and idealy a heavier buffer
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Old 08-25-2011, 1:27 PM
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Let's say I purchase a dedicated 9mm upper (Example: Rock River Arms or CMMG dedicated 9mm upper).
Will I still need to change the lower parts Hammer to a 9mm version?

If I'm following it correctly, after I get a dedicated 9mm upper and have all the normal lower receiver parts all I need is the following for the complete conversion:
-9mm Hammer(?)
-9mm Buffer
-9mm Mag Block
-9mm Magazine

Correct?
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  #8  
Old 08-25-2011, 1:33 PM
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CMMG makes an "enhanced" carrier that doesn't require a dedicated hammer.

all others will need the 9mm hammer
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Old 08-25-2011, 1:44 PM
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Buffer, Mag Block and Mag if you run the CMMG.

I run the CMMG and i use a normal hammer. i can use the lower on my 5.56 upper if i wanted to. only problem i had was using the notched hammer as it was too short and would not reset correctly. switched to the normal round hammer, which was longer and it worked fine after that.
CMMG has some great customer service BTW. My firing pin broke after a few hundred rounds and they shiped me out a new one for free.
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Old 08-25-2011, 2:10 PM
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Get the CMMG ramped carrier. You can use your standard lower parts kit with a rounded hammer. With a complete upper and ramped carrier, you will need the
Mag block
Idealy a 9mm buffer(they are heavier and longer than the starndard buffer) OR standard buffer and some quarters behind the buffer spring though I don't know how many.
9mm mag. You may want to read up on the difference between the colt design and the Olympic design. The colt uses UZI mags which are cheap and plentiful. The older OLY uses sten mags but the new setup which looks pretty sweet has a dedicated mag negating the use of a mag block. The OLY design is all proprietary just an FYI. Most go with the colt design and there is a large aftermarket for that setup.
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  #11  
Old 08-25-2011, 4:21 PM
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These guys have everything you need. I don't see them talked about to much on Calguns but when I ordered some 10rd mags they had super fast shipping. They have a complete 9mm kit minus the lower receiver for $825 or you can piece it together.
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  #12  
Old 08-27-2011, 11:35 AM
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Quote:
Originally Posted by barbasol View Post
These guys have everything you need. I don't see them talked about to much on Calguns but when I ordered some 10rd mags they had super fast shipping. They have a complete 9mm kit minus the lower receiver for $825 or you can piece it together.
Which guys?
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  #13  
Old 08-27-2011, 11:57 AM
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Not sure which bender he is talking about but spikes tactical is a one stop shop
Kevin
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  #14  
Old 08-28-2011, 12:33 AM
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check out the 9mm AR build link in my signature...
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  #15  
Old 08-28-2011, 9:28 AM
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Quote:
Originally Posted by Baga View Post
Let's say I purchase a dedicated 9mm upper (Example: Rock River Arms or CMMG dedicated 9mm upper).
Will I still need to change the lower parts Hammer to a 9mm version?

If I'm following it correctly, after I get a dedicated 9mm upper and have all the normal lower receiver parts all I need is the following for the complete conversion:
-9mm Hammer(?)
-9mm Buffer
-9mm Mag Block
-9mm Magazine

Correct?
yes that is it . use promag or cp /asc mags or modify uzi mags.
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  #16  
Old 08-28-2011, 10:34 AM
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debating on what parts to use... I am seriously leaning in the direction of a featureless 9mm so I can use the uzi mags that I have without having to modify them to hold <10 rounds
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  #17  
Old 08-28-2011, 2:32 PM
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Here's a post about Olympic Arms 9mm upper http://www.calguns.net/calgunforum/s...hlight=olympic . It seems like the easiest way to get a 9mm rifle.
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  #18  
Old 08-29-2011, 8:41 PM
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Ooops, sorry guys didn't realize I left out the vendor. 9mmar.com
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