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Posted: 11/5/2008 7:39:57 AM EDT
Are the rra blocks worth buying?  Or should I go with another option?  I'm building a dedicated 9mm gun, so ease of removal is not a concern.  

Polytech
Link Posted: 11/5/2008 10:24:04 AM EDT
[Last Edit: 11/5/2008 10:24:23 AM EDT by wahoo95]
I have a Hahn, but the RRA's are just as good as any of the others.
Link Posted: 11/5/2008 4:58:17 PM EDT
I've had mine for a least 5 years....no problems....functions great
Link Posted: 11/5/2008 8:05:09 PM EDT
I have both a hahn dedicated and RRA, either one is good to go.
Link Posted: 11/5/2008 8:32:40 PM EDT
Link Posted: 11/6/2008 2:12:07 PM EDT
No problems with my RRA block
Link Posted: 11/9/2008 10:40:21 PM EDT
I have an old style (drop in) RRA block that I'm having difficulty finding mags that will fit.  Most of the uzi style mags are too large to fit in the mag well.  I'm not against modifying them myself, If I can get some that fit.  Any suggestions?
Link Posted: 11/11/2008 7:11:35 PM EDT
Do the RRA and Hhan blocks work with the c products 9mm mags?  Sorry, very new to this
thx
Link Posted: 11/13/2008 7:37:03 AM EDT
I just got an email from C-Products stating their mags will work with Hahn blocks and do actuate the bolt hold open feature.  This is for the dedicated block, not sure about the top or bottom loader.

Zach
Link Posted: 11/13/2008 8:00:37 AM EDT
Originally Posted By Zach540:
I just got an email from C-Products stating their mags will work with Hahn blocks and do actuate the bolt hold open feature.  This is for the dedicated block, not sure about the top or bottom loader.

Zach


Please make sure to post up results/review after you get your block and mags and run your setup.
Link Posted: 11/13/2008 10:18:50 AM EDT
Originally Posted By kevins_garage:
Originally Posted By Zach540:
I just got an email from C-Products stating their mags will work with Hahn blocks and do actuate the bolt hold open feature.  This is for the dedicated block, not sure about the top or bottom loader.

Zach


Please make sure to post up results/review after you get your block and mags and run your setup.



Believe me, I plan to, I just ordered the block today from Brownells and the mags directly from C-Products.  I'll try and find a few more mags (i.e. UZI, Colt, ProMag) to compare to if possible.  

Zach
Link Posted: 11/13/2008 10:23:24 AM EDT
The RRA doesn't have a bolt hold open feature, right?  But the Hahn dedicated and the C Products do.
Link Posted: 11/13/2008 1:52:28 PM EDT
Originally Posted By engineer2001:
The RRA doesn't have a bolt hold open feature, right?  But the Hahn dedicated and the C Products do.



The RRA block does have the BHO feature.
Link Posted: 11/13/2008 5:11:29 PM EDT
Originally Posted By solartj:
The RRA block does have the BHO feature.


So, the 9mm FAQ is wrong?

"New" Rock River Arms mag block
-Bottom Loader
-Uses set screw to secure
-No bolt hold-open feature
-Replaced "Old" Rock River Mag block around January 2005.  Several RRA vendors have told people it is not worth the money ($150).

Link Posted: 11/14/2008 3:07:51 AM EDT
Originally Posted By engineer2001:
Originally Posted By solartj:
The RRA block does have the BHO feature.


So, the 9mm FAQ is wrong?

"New" Rock River Arms mag block
-Bottom Loader
-Uses set screw to secure
-No bolt hold-open feature
-Replaced "Old" Rock River Mag block around January 2005.  Several RRA vendors have told people it is not worth the money ($150).



Yes, that information is out of date (posted in 2003 and updated in 2005). The current RRA blocks have a BHO actuator similar to the Hahn dedicated and bottom loading block BHO actuators.

Link Posted: 11/14/2008 3:12:36 AM EDT
Originally Posted By solartj:
Originally Posted By engineer2001:
Originally Posted By solartj:
The RRA block does have the BHO feature.


So, the 9mm FAQ is wrong?

"New" Rock River Arms mag block
-Bottom Loader
-Uses set screw to secure
-No bolt hold-open feature
-Replaced "Old" Rock River Mag block around January 2005.  Several RRA vendors have told people it is not worth the money ($150).



Yes, that information is out of date (posted in 2003 and updated in 2005). The current RRA blocks have a BHO actuator similar to the Hahn dedicated and bottom loading block BHO actuators.



Yes, the RRA block does now have the BHO - I have one and it works just fine with Colt mags and those plastic mags. Of course the the modified Uzi mags still do not operate the BHO

Link Posted: 11/14/2008 5:02:54 AM EDT
Not to highjack the thread...  But has anyone tried to get the replacement followers from C-Products and put them into a modified Uzi mag?

Zach
Link Posted: 11/14/2008 5:16:24 AM EDT
Originally Posted By engineer2001:
Originally Posted By solartj:
The RRA block does have the BHO feature.


So, the 9mm FAQ is wrong?

"New" Rock River Arms mag block
-Bottom Loader
-Uses set screw to secure
-No bolt hold-open feature
-Replaced "Old" Rock River Mag block around January 2005.  Several RRA vendors have told people it is not worth the money ($150).


To put it simply, YES.  A large amount of the threads in this forum and many others contain somewhat inaccurate or even completely incorrect information.  Not to mention things in the 9mm world change over the years - old companies go away, new companies enter, products change, some information is more emotional in nature than fact based, etc...  There are ways to work around LRBHO anyway.  If the block doesn't have a built-in actuator to activate the std bolt catch, all one has to do is replace their std bolt catch with a 9mm bolt catch and voila, LRBHO.




Originally Posted By Zach540:
Not to highjack the thread...  But has anyone tried to get the replacement followers from C-Products and put them into a modified Uzi mag?

Zach

And you would be trying to accomplish what?  The Uzi mag doesn't have a channel on the back for the BHO tab to ride in.  You may be able to replace an Uzi follower with a CP follower, but you would have to grind down the back of the CP follower flat, which would leave you with an Uzi mag with a plastic CP follower and still no BHO.
Link Posted: 11/14/2008 8:06:27 AM EDT


Originally Posted By Zach540:
Not to highjack the thread...  But has anyone tried to get the replacement followers from C-Products and put them into a modified Uzi mag?

Zach

And you would be trying to accomplish what?  The Uzi mag doesn't have a channel on the back for the BHO tab to ride in.  You may be able to replace an Uzi follower with a CP follower, but you would have to grind down the back of the CP follower flat, which would leave you with an Uzi mag with a plastic CP follower and still no BHO.



M60JOE has way to alter the Uzi follower to operate the BHO. I may try this (when I get a few more projects out of the way).

Uzi Mag and BHO

Link Posted: 11/14/2008 9:18:18 AM EDT
Originally Posted By GunCat:

Originally Posted By Zach540:
Not to highjack the thread...  But has anyone tried to get the replacement followers from C-Products and put them into a modified Uzi mag?

Zach

And you would be trying to accomplish what?  The Uzi mag doesn't have a channel on the back for the BHO tab to ride in.  You may be able to replace an Uzi follower with a CP follower, but you would have to grind down the back of the CP follower flat, which would leave you with an Uzi mag with a plastic CP follower and still no BHO.



M60JOE has way to alter the Uzi follower to operate the BHO. I may try this (when I get a few more projects out of the way).

Uzi Mag and BHO




That's exactly what I was looking to do, I haven't built my 9mm yet, so I wasn't sure if it was the follower that actuated the bolt hold open or not.  

Thanks for the link.

Zach
Link Posted: 11/14/2008 9:28:46 AM EDT
Originally Posted By GunCat:
M60JOE has way to alter the Uzi follower to operate the BHO. I may try this (when I get a few more projects out of the way).
Uzi Mag and BHO


I'm aware of that mod, but it is not quite the same as merely attempting to drop a CP follower into an Uzi mag.
Link Posted: 11/14/2008 10:45:40 AM EDT
Originally Posted By kevins_garage:
Originally Posted By GunCat:
M60JOE has way to alter the Uzi follower to operate the BHO. I may try this (when I get a few more projects out of the way).
Uzi Mag and BHO


I'm aware of that mod, but it is not quite the same as merely attempting to drop a CP follower into an Uzi mag.


True...

...and I know what you were saying about the CP followers

Link Posted: 11/14/2008 10:45:41 AM EDT
[Last Edit: 11/14/2008 11:36:35 AM EDT by GunCat]
DT
Link Posted: 11/14/2008 10:57:03 AM EDT
So I've ordered an upper an blocks from RRA, what type of mags do I need to buy?
Link Posted: 11/14/2008 5:44:21 PM EDT
[Last Edit: 11/14/2008 5:44:37 PM EDT by engineer2001]
Originally Posted By PolyTechKID:
So I've ordered an upper an blocks from RRA, what type of mags do I need to buy?


RRA blocks work with modified Uzi magazines like RRA still sells, or they work with Colt or C Products magazines.  Based on what I have read (which has been wrong before), the Uzi mags do NOT have a follower that allows activation of a bolt hold open.  So, I'd go Colt/Metalform or C Products (new Colt).
Link Posted: 11/14/2008 6:09:46 PM EDT
Originally Posted By PolyTechKID:
So I've ordered an upper an blocks from RRA, what type of mags do I need to buy?


Keep in mind according to C-Products, you need to lower your RRA block to allow the use of their mags.  Not sure if by lowering the block if it will interfere with Colt or Uzi type mag usage though.

Zach
Link Posted: 11/15/2008 4:28:59 PM EDT
I have two RRA 9mm's with the RRA block and I'm very happy with them.
Link Posted: 11/19/2008 6:49:22 AM EDT
I just took delivery of a new RRA LAR-9 with the factory RRA mag block. The rifle came with 1 25-rd modified uzi mag that feeds flawlessly. Unfortunately, the pile of C Products mags that I bought will not fit in the rifle. I have to ram them in with a hard slap to engage the mag catch, and then the fit is so tight I can't even retract the bolt because the mags sit too high.

I tried loosening the set screw and lowering the mag block as far as possible, but it doesn't lower very much due to the mag release/catch cutout in the block. So the C Products mags (new teflon ones with orange followers) DO NOT function in my RRA with factory mag block.

On a side note, does anyone have a good source for modified uzi mags? I ordered some Promag polymers, but I want to get some more metals mags.

Eric
Link Posted: 11/19/2008 9:55:07 AM EDT
[Last Edit: 11/19/2008 9:55:55 AM EDT by kevins_garage]
1. You can buy Uzi mags for $10 from a guy on uzitalk and pay M60Joe about $10 each plus shipping to modify them.

2. You can buy Colt/Metalform 9-SMG-32-P mags from HERE for $34 each plus shipping.

3. You can shop around for Colt marked Metalform mags in the EE.

4. You can mod your mags and upper if you want to try and get the CP mags to work - check around for all of the threads on the numerous mods people have made.

5. You could pay an extra $100 and replace your RRA block with a CP block and hope that works.

I'd pick 1, 2, or 3 personally, but good luck to you whatever you decide.
Link Posted: 11/19/2008 11:10:41 AM EDT
kevin,

Thanks so much for the help. I'd like to get a bunch of the metalform mags and then just keep my eyes peeled for already mod'ed uzi mags on the EE.

Do you know what the differences are between the 4 different kinds of mags listed for the M16A2 9mm: 9-SMG-32-P, 9-SMG-32-S, 9-USMG-32-P, and 9-USMG-32-S? Their website says SMG = flat feed lips and USMG = upturned feed lips. I just want to make sure I get the right ones as I'd like to order 6 or 8 mags. The modified uzi mag that came from RRA appears to have slightly upturned feed lips. Thanks again.

Eric
Link Posted: 11/19/2008 11:31:26 AM EDT
The -P designates the polymer follower and the -S designates the steel Uzi style follower.

All of the Colt marked Metalform mags I have are the SMG standard feed lip variety and I've been happy with their functionality/reliability.  Most of mine have the polymer follower, but I do have a couple with the metal follower.  I have not noticed a performance difference between either.

If you want more info on the USMG upturned feed lip version, you may want to call Metalform and ask to talk to their magazine plant manager (I forget his name right now).  He may be able to explain what the benefits are.

Metalform is very reasonable on their shipping.  I was only charged $8.50 shipping when I ordered 8 mags.  It wouldn't hurt to call them and maybe order 1 each of the SMG and USMG to try out and then place another order for the other 6 after you have tested both in your gun and are satisfied they work.
Link Posted: 11/19/2008 2:39:08 PM EDT
Originally Posted By Ookster:
On a side note, does anyone have a good source for modified uzi mags? I ordered some Promag polymers, but I want to get some more metals mags.


ADCO Firearms sells them for $35 right now.

For that price, I'd go Colt/Metalform instead.

Link Posted: 11/20/2008 10:12:06 AM EDT
[Last Edit: 11/20/2008 8:56:00 PM EDT by engineer2001]
How well does the RRA mag block lock into the lower receiver's mag well?  I have read about bottom-loading blocks yanking out with the mags.  Is this an issue with the RRA block?
Link Posted: 11/20/2008 2:54:54 PM EDT
Originally Posted By engineer2001:
How well does the RRA mag block lock into the lower receiver's mag well?  I have read about bottom-loading block syeanking out with the mags.  Is this an issue with the RRA block?


I can't imagine a well-tightened RRA block coming loose.  I think the only way a mag could get stuck would be on the bolt catch, which would pull on the rifle receiver.  My one and only home converted Uzi mag drops free, no yanking required.

I read about the same concern you have, but now that I have seen it with my own eyes I don't worry about it.
Link Posted: 11/21/2008 7:40:07 PM EDT
Originally Posted By jmkrick:
I have two RRA 9mm's with the RRA block and I'm very happy with them.

What mags are you using???
Link Posted: 11/22/2008 6:46:57 AM EDT
Originally Posted By Ookster:
I tried loosening the set screw and lowering the mag block as far as possible, but it doesn't lower very much due to the mag release/catch cutout in the block. So the C Products mags (new teflon ones with orange followers) DO NOT function in my RRA with factory mag block.
Eric


Lowering the block does not change the depth of the mag in relation to the bolt.
Lowering the block only lowers the ramp and ejector in relation to the bolt.
The mag catch is determining the position of the mag.
Check this thread "C-PRODUCTS MAG FIX"  for a simple fix for the C-Products mags you already have.
This took me only a couple minutes per mag to do.
On a side note, the last batch I got from 44mag.com did not need this fix.
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