 bugeyes 
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Joined: Apr 2005 
 Posts: 327 Feedback: 100% (48) |
Posted: 5/3/2012 10:03:31 AM
THE IMAGE ABOVE IS A PAID ADVERTISEMENT |
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Posted: 5/3/2012 1:35:46 PM
[Last Edit: 5/3/2012 1:38:51 PM by carbineone1964]
Blackdog mags will not work with the CMMG BHOA.We use one of the devices with blackdog drums but it will not hold the bolt open on the last round.We just use it to manually hold the Bolt open.No Blackdogs will give full BHO function with the CMMG device.
The mags made by CMMG for the device are differant than others mags.In other words you can still use the device to hold the bolt back if using blackdogs but it will not hold it back once the last round is expelled,You have to lock it back manually,or rely on the Blackdog mag to follower to stop it after the last round is fired.But when you remove the Blackdog the bolt will close. I do not know if this is the case with straight Blackdog mags but we had to modify the BHOA to allow it to even work with BD drums for manually locking the Bolt back. |
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forever4
Firearms aficionado
Team Member
Joined: Nov 2008  KY, USA
Posts: 3028 Feedback: 100% (27) Link To This Post |
Posted: 5/3/2012 6:43:34 PM
[Last Edit: 5/3/2012 6:50:00 PM by forever4]
Some months back I posted some close up photos of the BDM mags next to the new CMMG mags. From the photos it was easy to see how CMMG had changed the design of the follower to be longer and set back more to work the BHOA adapter. I might still have those photos somewhere.
If you see the mags next to each other its easy to see the difference. The CMMG mags have a follower that is towards the rear of the magazine far enough to lift the BHOA up and lock back the bolt. The original CMMG BHOA mag was a modification of a standard magazine. It required a special follower that was made with several pieces, one being a spring loaded piece that popped to the rear when the follower reached the top of the mag. This piece would then protrude to the rear far enough to catch the BHOA. When CMMG redesigned their magazine they just made the follower longer so this complicated piece didn't have to be used at all. I have several of the latest magazine and they do function much nicer than the originals. The followers in the BDM magazines is just not long enough to stick back and catch the BHOA, so they don't work it. I suppose BDM could make a modification to their design to make it work but then they run into some complex issues like compatibility with other .22 setups and perhaps patent violations. |
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Posted: 5/5/2012 12:51:10 PM
Originally Posted By carbineone1964: Blackdog mags will not work with the CMMG BHOA.We use one of the devices with blackdog drums but it will not hold the bolt open on the last round.We just use it to manually hold the Bolt open.No Blackdogs will give full BHO function with the CMMG device. The mags made by CMMG for the device are differant than others mags.In other words you can still use the device to hold the bolt back if using blackdogs but it will not hold it back once the last round is expelled,You have to lock it back manually,or rely on the Blackdog mag to follower to stop it after the last round is fired.But when you remove the Blackdog the bolt will close. I do not know if this is the case with straight Blackdog mags but we had to modify the BHOA to allow it to even work with BD drums for manually locking the Bolt back. The other problem is that rounds sit farther back in the feed lips on Black Dog magazines than in the CMMG magazines. So the rim of the case ends up catching on the BHOA follower, and locking the bolt back when you don't want it to! I cut the "tab" off of the BHOA follower and just use it to lock the bolt open manually. This is one of the "straight" (15 rd) BD mags and an original (unmodified) BHOA.  |
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Posted: 5/5/2012 1:03:24 PM
Tab removed.
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Posted: 5/5/2012 1:17:10 PM
Originally Posted By Schleprock:
I cut the "tab" off of the BHOA follower and just use it to lock the bolt open manually. Question, if I get the BHOA and cut that tab off, the gun will run just the same... with the ability to engage the BHOA manually? I converted my Spikes upper to CMMG's Evolution bolt, but since I live in New Jersey, I wanted to keep the 15 round capability (got the same magazines you pictured). Being able to manually lock back the bolt (I run a BAD lever on my common lower), then load somewhat like the standard AR design, that is a big win. Right now, it is the standard use with the bolt going forward when the magazine is removed... so, the extra movement to lock the bolt back wouldn't be an issue. |
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Posted: 5/6/2012 2:18:41 AM
Correct.
The magazine follower will catch the bolt after the last round is fired like it normally does. 1) Draw back the bolt a bit farther with the charging handle and lock it with the bolt release lever. 2) Change magazines and hit the bolt release lever again. Locked and loaded....  |
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SpecOps-13
Weapon Systems Test and Evaluation,
Team Member
Joined: Apr 2007 FL, USA
Posts: 4663 Feedback: 0% (0) Link To This Post |
Posted: 5/6/2012 8:29:30 AM
Originally Posted By Schleprock:
Correct. The magazine follower will catch the bolt after the last round is fired like it normally does. 1) Draw back the bolt a bit farther with the charging handle and lock it with the bolt release lever. 2) Change magazines and hit the bolt release lever again. Locked and loaded....
+1 BDM has great mags but you'll need to do the above when using them.... Dave S |
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Posted: 5/6/2012 8:41:42 AM
Looks like I'm buying another BHOA... sold the previous one with all the follower/spring kits when I found out the followers would not fit in the newer BDM magazines.
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Posted: 5/6/2012 2:18:27 PM
I only had to cut about a 1/16 inch off the little tab to work with the blackdog.But if you can completely remove it that works too.
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Posted: 5/6/2012 5:45:51 PM
[Last Edit: 5/6/2012 5:47:00 PM by Schleprock]
Does it still work reliably automatically locking the bolt back with CMMG mags with the 1/16" removed?
I'm not worried about it working with magazines I don't have / can't get anyway. I cut mine to completely clear the magazine lips in order to give the bolt plenty of clearance to strip rounds from the BD magazines. Less chance of something jamming up or inadvertently locking the bolt open with rounds still in the magazine. Whatever works for you, go for it. It doesn't matter what anyone else does if it doesn't work in your rifle. |
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Posted: 5/6/2012 6:42:34 PM
[Last Edit: 5/6/2012 9:06:45 PM by carbineone1964]
It will occasionally not function with the BHO mags with the 1/6th of an inch removed. Still works most of the time. Like I said though we just keep a modified one and a stock one on hand. Easy enough to swap em out depending on which mags we are using at the time.
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Posted: 5/7/2012 11:39:56 PM
Yeah. Too bad CMMG discontinued those magazines now eh? What a joke!
I also now see that Black Dog is no longer carrying any CMMG conversion units. That sure isn't a good sign either....  |
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Posted: 5/8/2012 10:35:46 PM
Originally Posted By Schleprock:
Yeah. Too bad CMMG discontinued those magazines now eh? What a joke! I also now see that Black Dog is no longer carrying any CMMG conversion units. That sure isn't a good sign either....
Which mags did CMMG discontinue? |
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Posted: 5/9/2012 8:07:04 AM
Originally Posted By MGP: Which mags did CMMG discontinue? The grey BHOA magazines. You can't even get parts (springs, followers) for them anymore. http://www.ar15.com/forums/t_2_145/219313_22_Evolution_BHOA_Mag_Springs_not_on_CMMG_web_site_.html They are being replaced by the new "Evolution" magazines, which you can't get either right now. They "say" they have started shipping them, but I've only seen about 3 people here say they ever got any. I pre-ordered 6 months ago and haven't seen squat. I know other folks have been waiting a lot longer than that. Something broke on your grey mag? Too bad. Order another new $30 magazine. And hope it shows up some day.... |
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