Anybody know of a source for the followers that make this thing work?  I have one mag that came with the bolt hold open device (for ARs running a conversion kit), and it looks like the only difference between it and a regular .22 conversion mag is the follower.  It doesn't look like CMMG is making anything these days, an nobody who lists the followers shows them in stock.

try here  http://blackdogmachinellc.net/

Assume you're trying to get this thing to work the way it was designed to?


They have been discontinued by CMMG because the mags they needed to function were too expensive to make.

As for the Black Dog mags:  "CMMG .22 Kit NOTE: WILL WORK WITH THE B.H.O.A. BUT WILL NOT ACTIVATE IT."

I have the CMMG BHOA & the Evo mags they were designed to work with.  The BHOA needed to be modified to work properly.
They used to have a video about filing an angle on the metal tab.  Once the angle was made, it functions perfectly.

It also works with the Black Dog mags & will hold the bolt open after the last round, but will drop the bolt when the mag is released.
The Evo mags will not drop the bolt when they are released.

This will work with the S&W 15-22 mags.

http://www.redi-mag.com/index.php?l=product_detail&p=52