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View Full Version : Cali Legal 9mm? how do I build one?


Saym14
10-05-2009, 11:42 PM
searched but no answers. I see RRA and Riflegear has all I need - but what about the BB and the fixed mag?

djleisure
10-05-2009, 11:50 PM
searched but no answers. I see RRA and Riflegear has all I need - but what about the BB and the fixed mag?
yep, you need a BB and mags that hold 10 rounds or less... or you can go featureless and use your existing hi-cap mags if you have any. Featureless = monsterman grip (or solar tactical grip) and no forward vertical grip and no flash hider (brake only.) It's still a centerfire rifle, so all those rules apply.

Rukus
10-05-2009, 11:52 PM
yep, you need a BB and mags that hold 10 rounds or less... or you can go featureless and use your existing hi-cap mags if you have any. Featureless = monsterman grip (or solar tactical grip) and no forward vertical grip and no flash hider (brake only.) It's still a centerfire rifle, so all those rules apply.

Dont forget about the fixed (non collapsing) stock.

NSR500
10-05-2009, 11:53 PM
What about the BB and Fixed Mag do you not understand?

A 9mm rifle still needs to be configured in compliance with California law. Following the AW Flowchart can guide you through the process: http://www.calguns.net/caawid/flowchart.pdf
As for the actual hardware you'd need an AR15 lower with a 9mm block or a dedicated 9mm AR lower.
For build configuration it would depend on if you go featureless, or evil featured.
Evil featured will need a BB and featureless would not. The rules for magazine capacities continue to apply as well.

djleisure
10-06-2009, 12:02 AM
Dont forget about the fixed (non collapsing) stock.

Ooh yeah, that's important too! All that stuff! Like I said, centerfire rules apply, just like any AR, regardless of caliber.

Desert_AIP
10-06-2009, 7:26 AM
Just use a Bullet Button and 10 round magazines and you are good to go.

http://i175.photobucket.com/albums/w135/Desert_AIP/My_9mm_AR.jpg

Saym14
10-06-2009, 10:19 AM
I guess I do not understand how the mag block works. I thought the regular mag release holds the block in. what holds in or releases the mag itself? or does the mag and block release and come out together? how does the mag connect to the mag block?

CHS
10-06-2009, 10:40 AM
I guess I do not understand how the mag block works. I thought the regular mag release holds the block in. what holds in or releases the mag itself? or does the mag and block release and come out together? how does the mag connect to the mag block?

The mag block has a set-screw that holds it in place. It's indexed by the mag catch, but the mag catch works to hold the mags in. A standard bullet button works with either a mag block or a dedicated lower like this:

http://i335.photobucket.com/albums/m446/bdsmchs/CHS9mmAR.jpg

Saym14
10-06-2009, 11:44 AM
The mag block has a set-screw that holds it in place. It's indexed by the mag catch, but the mag catch works to hold the mags in. A standard bullet button works with either a mag block or a dedicated lower like this:

http://i335.photobucket.com/albums/m446/bdsmchs/CHS9mmAR.jpg

thanks - I would not have a dedicated lower. I would need the mag block. in such a case it would seem easy to convert back and forth? remove mag block and change hammer?

CHS
10-06-2009, 11:54 AM
thanks - I would not have a dedicated lower. I would need the mag block. in such a case it would seem easy to convert back and forth? remove mag block and change hammer?

Why bother? Lowers are CHEAP! Just build a second dedicated gun. You don't have to use the dedicated lower, but it would be silly to go through all the work of converting back and forth when for a few dollars more worth of parts you can just have a second gun.

Saym14
10-06-2009, 12:06 PM
Why bother? Lowers are CHEAP! Just build a second dedicated gun. You don't have to use the dedicated lower, but it would be silly to go through all the work of converting back and forth when for a few dollars more worth of parts you can just have a second gun.

i figure at least 200 for the lower NIC a stock. not exactly cheap for someone on an budget.

Desert_AIP
10-06-2009, 1:19 PM
I guess I do not understand how the mag block works. I thought the regular mag release holds the block in. what holds in or releases the mag itself? or does the mag and block release and come out together? how does the mag connect to the mag block?


I use a Hahn dedicated which inserts from the top and can't be removed without removing the bolt catch. It is a dedicated rifle.

When using the RRA or other bottom load mag block, it is held in with a screw and tension. Loosening the screw requires a tool.
Even with the screw removed and no tension on the block, the mag catch will prevent removal of the magblock.
With a bullet button installed, you would still need a tool, to remove the magazine.

You can add extra security by threading the block for a pan head screw inserted through the front of the magwell. This will require the removal of the screw and loosening of the magblock tension device, after removing the magazine, to remove the block.

You can remove the RRA block in just a minute or so and swap on a different upper to change calibers.

ETA:
RRA magblock
Notice the allen screw at the bottom of the magblock and the steel pin about midway on the forward portion.
There is another pin on the other side. As you tighten that allen screw the pins push out on the sides of the magwell to hold it in.

http://www.rainierarms.com/img/shop/product/944d9b8caf26c5432c76490b37f7653e.jpg

The magcatch protrudes through that slot on the side and holds the magazine in place. You can't remove the magblock without depressing the magcatch, which is prevented by the bullet button.

http://www.rainierarms.com/img/shop/product/13dfd172bcd65a00bfa876b52f935626.jpg

Magblock retention screw modification.
http://users.zoominternet.net/~picplace/magwellpinned.jpg

Saym14
10-06-2009, 1:37 PM
thanks - nice pics.