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Posted: 10/15/2004 2:51:23 AM EST
I am throwing around the idea of converting my M4 to 9mm but I need to do my research first. Will all of the RRA conversion parts be compatible with my Colt? Also, am I limited to using strictly converted Uzi mags in the RRA mag block?
Link Posted: 10/15/2004 8:51:25 AM EST
The Rock River Arms upper will go right on to your colt. For mag block I dont know how there set up works. I would think that your colt should have the small front take down pin. So it should go right on without any off set pins.
Link Posted: 10/15/2004 10:04:35 AM EST
Careful there... do you have a sear block? Of so, you may need to file the top of the sear block down to allow it to clear the 9mm Bolt. I had a R6601 Match HBAR that had to have the top of the sear block removed or filed down...

The reason is that the 9mm bolt is full auto...

Now, someone correct me if I am wrong as I know I did this for either my Ciener conversion or the 9mm bolt and I am pretty sure it was the 9mm bolt that was the issue!
Link Posted: 10/15/2004 4:03:27 PM EST
Thanks for the info. DO I need to have a gunsmith do the work if the sear block needs to be filed?
Link Posted: 10/15/2004 5:14:20 PM EST
good point I did not think about the sear block. You can have the sear block removed and still be within the law.
Link Posted: 10/15/2004 5:23:29 PM EST
It sounds like doing a 9mm conversion is a little more work than going out and buying a completed upper along with the other parts and dropping them right in. Is the RRA mag block only compatible with modified Uzi mags? Sten mags?
Link Posted: 10/16/2004 4:07:11 AM EST

Originally Posted By jonemtp:
It sounds like doing a 9mm conversion is a little more work than going out and buying a completed upper along with the other parts and dropping them right in. Is the RRA mag block only compatible with modified Uzi mags? Sten mags?



The RRA Mag block is compatable with the Colt Mags... any other mags that are modified to work with the Colt System (UZI, South African, etc) will work fine.... IT WILL NOT work with Sten mags!
Link Posted: 10/16/2004 7:21:40 AM EST

Originally Posted By jonemtp:
It sounds like doing a 9mm conversion is a little more work than going out and buying a completed upper along with the other parts and dropping them right in.
Stay away from them goofy COLT lowers with all the sear block and .312 front pivot hole, and all is well, use a std everyday lower from somebody else that sticks to the std AR prints as it is supposed to be.

Is the RRA mag block only compatible with modified Uzi mags? Sten mags?
You will use factory Colt mags, -- OR --Uzi mags with a cut-out to duplicate that as found on the factory Colt mags, to allow mag retention via std AR/M16 mag catch. Sten mag not readily used, but can be done by modifying existing blocks extensivly to allow Sten mag use in the Colt style system.With the Hy-Tech block, you will use Uzi mags as is.
Refer to the Tacked threads at to of forum.




Link Posted: 10/16/2004 11:47:19 AM EST
So basically, I cannot use my Colt M4 Match Target Lower?
Link Posted: 10/16/2004 2:02:45 PM EST
Unless you modify it, and swap out parts, No.
Link Posted: 10/16/2004 3:35:17 PM EST
Hey John, can I use your EA lower for the 9mm conversion? (only kidding!)
Link Posted: 10/17/2004 4:35:44 AM EST
[Last Edit: 10/17/2004 4:45:49 AM EST by Quarterbore]

Originally Posted By jonemtp:
So basically, I cannot use my Colt M4 Match Target Lower?



It is very east to cut down the top of a sear block...

Here is the factory sear:






Here are a couple pics of a sear block that was filed down to work with the 9mm bolt ...





You can also have the block removed or do it yorself... seach for a thread...

Here is a pic where someone removed the block:

Link Posted: 10/17/2004 3:53:05 PM EST
So, I can modify or remove the sear block and still be within the confines of the law?
Link Posted: 10/17/2004 4:20:28 PM EST

Originally Posted By jonemtp:
So, I can modify or remove the sear block and still be within the confines of the law?



Yes... Colt did this to their lowers for no other reason then they were afraid we were to dangerous for our own good! There is no law requiring these stupid things to be there so you can modify it or remove it!
Link Posted: 10/17/2004 4:26:29 PM EST
I didn't try to search until now but here are some threads that will help...

ar15.com/forums/topic.html?b=3&f=12&t=202184

ar15.com/forums/topic.html?b=3&f=12&t=199456

Again, I just removed the top of mine to use the 9mm bolt but other people pluck them completely...
Link Posted: 10/17/2004 4:49:27 PM EST
[Last Edit: 10/17/2004 5:05:33 PM EST by jonemtp]
Thanks for the info Quarterbore. It is people like you on this forum that make it enjoyable as well as a learning experience.



So I can just punch the pins out of the block and remove it, and it will not affect .223 operation?
Link Posted: 10/17/2004 5:03:28 PM EST
[Last Edit: 10/17/2004 5:05:50 PM EST by jonemtp]
Well whatta ya know, I just opened up my lower and it does not have a sear block. I have a Colt Match Target M4 post ban. It is less than a year old.
Link Posted: 10/17/2004 6:15:55 PM EST

Originally Posted By jonemtp:
Well whatta ya know, I just opened up my lower and it does not have a sear block. I have a Colt Match Target M4 post ban. It is less than a year old.



Funny how we make things so compliacated some times.... huh... Enjoy!
Link Posted: 10/17/2004 6:33:37 PM EST
Thanks again for your help.
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