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View Full Version : Specs/how-to fab a 10-round M1918 B.A.R magazine?


darth_holder
05-28-2009, 12:23 PM
Hi everyone,

Have been reading these forums for a little over a year, and want to start my first post by saying the volume and quality of info on Calguns is astounding. You guys are champs!

Ok, the question...

I recently got my paws on a Cobb MCR300 rifle, and am working on assembling it into a CA-legal firearm. My final obstacle is that this MCR300 takes the old WWII Browning Automatic Rifle mags - 20 rounds, which would be great if I lived in just about any other state. :(

Although I managed to get my hands on a pile of rusty old B.A.R. magazines that cleaned up nice n' purty, I haven't been able to find any 10-rounders.

Now, if I'm going to sacrifice any of these precious mags for the sake of this state's @#%! :censored: gun laws, I at least want the benefit of a few real honest-to-goodness shortened magazines for prone shooting as compensation for my loss. I also want the finished products to still be magazines that I can completely disassemble/repair/clean. That means I need to cut them down to size... no rivets, dowels, body-filler, epoxy, etc.

So, does anyone know of any information, dimensions, schematics, how-to's, alien technology, or anything else that might help me in this endeavor?

Alternatively, does anyone know where I can purchase one? I've already tried Ohio Ordnance, and they do make them for their CA customers, but they won't give me the time of day unless I buy one of their M1918A3 B.A.R.s for $3500 :eek:

Thanks in advance for any help... obligatory MCR300 gunporn here: :D

24304

Oh yeah, and just to preempt any concerns about my legal standing with this rifle:


I recently got the custom magazine release working, based on a Prince50 Bullet Button.
The pic was taken out-of-state prior to purchase, thus the original properly-functioning mag release button. At no point have the rifle parts been assembled in this form in the state of CA.
All my standard-capacity magazines are in fact magazine parts, for use either on out-of-state field trips or as fodder to construct CA-legal specimens.

Thanks!

-DH

ar15barrels
05-28-2009, 12:36 PM
I at least want the benefit of a few real honest-to-goodness shortened magazines for prone shooting as compensation for my loss. I also want the finished products to still be magazines that I can completely disassemble/repair/clean. That means I need to cut them down to size... no rivets, dowels, body-filler, epoxy, etc.


Chop and channel baby...

http://media.motortopia.com/files/5995/vehicle/4630d19daa9ec/Dominators_46th_014.jpg

03A4
11-11-2009, 9:50 PM
The MCR300 is one of my dream rifles! I dont know what it is, but a long action ar in 30-06 is......... Anyways I've emailed Bushmaster and was told soon it will be available. I just hope it will be a OLL if it is I'm selling a few guns to help pay for it.

darth_holder
11-11-2009, 11:24 PM
Necropost!

Yeah well, Bushmaster's been promising the rerelease Cobb's line of MCRs and .50 BMG boomsticks for a while, along with the Magpul Masada/Bushmaster ACR/Remington ACR... so while I'd love to add an MCR-400 in .338 Lapua Magnum to my collection, I interpret "soon" with a healthy dose of pessimism
:wheelchair:

As far as OLLs go, you're good. Any make & model that didn't exist at the time the lists were created (eg: anything from Cobb) obviously won't be on any of the lists. Even if they get the Bushmaster name on them, they're still a completely new model.

FWIW, if anyone else out there is thinking of bringing an MCR-300 into California, beware that the mag release looks like a standard AR mag release, but the button is significantly smaller and the stud on the mag release latch is threaded 10-32 instead of the standard 8-32.

This means unless you want to go "featureless" you will have to make your own Bullet Button or have an existing Bullet Button drastically altered. Jiffy Machine in Santee has the CNC equipment to do the job, and were very patient in working with me to get it right, but be prepared to shell out some $$$.

No such issues with the MCR-200s... the DPMS/SR-25 mag well and the HK91/G3 mag well both take Bullet Buttons with no muss or fuss.

So, is there anyone else out there at all that has a Cobb MCR in California?

ar15barrels
11-12-2009, 7:50 AM
FWIW, if anyone else out there is thinking of bringing an MCR-300 into California, beware that the mag release looks like a standard AR mag release, but the button is significantly smaller and the stud on the mag release latch is threaded 10-32 instead of the standard 8-32.

The standard AR mag catch and mag release button uses 10-32 threads. ;)

Vinz
11-12-2009, 8:06 AM
DH, did you ever get your 10 round magazine issue resolved?


How about a blocking type mag lock. Similar to B16?

Vinz

CAL.BAR
11-12-2009, 1:58 PM
If you need 10 rd mags, call Ohio Ordnance Works. They sell the BAR with Cal ready 10 rd mags. ($150.00 for two)

03A4
11-13-2009, 5:33 AM
My friend who I go shooting with gave me crap for thinking this, but I've thought of selling my Barrett .416 just to get the $ for a MCR300. I know its a Barrett and who'd in their right mind would want to sell one. The only reason is the price of ammo is $405 per 80 rounds. I could reload, but I think buying the supplies other than brass since I have a crap load (about 300-400) would cost a little much since the bullets are solid brass. I dunno if I'd sell it and maybe I'll start reloading hell my brothers friend reloads and he and I talked reloading for it.

ar15barrels
11-13-2009, 8:13 AM
My friend who I go shooting with gave me crap for thinking this, but I've thought of selling my Barrett .416 just to get the $ for a MCR300. I know its a Barrett and who'd in their right mind would want to sell one. The only reason is the price of ammo is $405 per 80 rounds. I could reload, but I think buying the supplies other than brass since I have a crap load (about 300-400) would cost a little much since the bullets are solid brass. I dunno if I'd sell it and maybe I'll start reloading hell my brothers friend reloads and he and I talked reloading for it.

The bullets will cost you $1.40 a piece. http://lehighbullets.com/products.asp?cat=20
Primers are 3 cents.
Figure 42 cents for powder and you are at $1.85 a round.
Figure $800 for a really nice reloading setup and you pay off the reloading tools in about 250 rounds of ammo that you reloaded.
http://www.calguns.net/calgunforum/showthread.php?t=158086

darth_holder
12-17-2009, 4:03 PM
DH, did you ever get your 10 round magazine issue resolved?


How about a blocking type mag lock. Similar to B16?

Vinz

Nope, nothing's turned up yet...

As far as the B16, you'd still have the same problems as with the Prince50. Either way you're going have to have some CNC work done. I went with the Prince50 just so I'd have the option of attaching a wonder-wrench when I take the rifle out of state (although that's now seeming like the only way I'll ever use it anyway :rolleyes:).

djandj, I did speak to Ohio Ordnance again shortly after my original post, and convinced them to sell me some, but then after further discussion found out that theirs are just blocked 20-rounders as well. I really want a short honest-to-god 10 rounder if I'm going to get one.

For now all I can think of is to wait for Bushmaster to get around to making more MCRs and see if that doesn't push the issue of BAR mags in CA

-DH