blackdogmachine
UZI Talk Life Member
loader
the AR 15 loader
the AR 15 loader
Black Dog machine out of AC-556 mags?
- Thread starter linx310
- Start date
UZI Talk Life Member
well Im sorry to say that the two mags I got today do not fit correctly.
It seems to have to do with the round lock-up hole in the front of the mag.
I am going to have to look into it more closely. It may be that the hole is much to large and also not located correctly. The mag appears to not lock up correctly in that front hole to pin area. I can easily rock the mag front to back and it pops out. The side to side fit is now correct, where before on the other mags it was too tight.
It seems to have to do with the round lock-up hole in the front of the mag.
I am going to have to look into it more closely. It may be that the hole is much to large and also not located correctly. The mag appears to not lock up correctly in that front hole to pin area. I can easily rock the mag front to back and it pops out. The side to side fit is now correct, where before on the other mags it was too tight.
Here is what I am finding....
1.The lock-up hole in the front is too large.
2.The lock-up tab on the rear does not extend high enough. The width of this tab is now correct. I can see where you milled the width. The bottom of the rear tab appears also correct. The length of this tab is incorrect. When compared to a factory mag or a ciener 22 mag, the tab is much longer on those. The longer rear tab or lug prevents the mag from upward travel once the tab rides over the mag catch. The short tab on the BDM when inserted, rides over the mag catch correctly BUT then is allowed to continue upward because the tab is not long enough.
3. The combination of both the rear tab/lug length AND the front hole size is allowing the mag to be very unstable and it rocks excessively front to back.
4. The top front screw is too long and extends out the mag body
The mag in a test firing does fire but I had Fail to feed problems due to the mags lock-up being unstable
1.The lock-up hole in the front is too large.
2.The lock-up tab on the rear does not extend high enough. The width of this tab is now correct. I can see where you milled the width. The bottom of the rear tab appears also correct. The length of this tab is incorrect. When compared to a factory mag or a ciener 22 mag, the tab is much longer on those. The longer rear tab or lug prevents the mag from upward travel once the tab rides over the mag catch. The short tab on the BDM when inserted, rides over the mag catch correctly BUT then is allowed to continue upward because the tab is not long enough.
3. The combination of both the rear tab/lug length AND the front hole size is allowing the mag to be very unstable and it rocks excessively front to back.
4. The top front screw is too long and extends out the mag body
The mag in a test firing does fire but I had Fail to feed problems due to the mags lock-up being unstable
blackdogmachine
UZI Talk Life Member
MMM, well they worked good for me, I didnt change the rear lug other than thinner. The sidewalls only got thinner by .005 a side. The front hole was moved up only .025. Thats it, pretty minor changes. With some more feedback I can do more if needed, I thought we nailed it per all the responce we got?? help?
This first pic shows RUGER BDM CIENER
Note the BDM lock-up hole is much, much bigger.
This larger hole and maybe misaligned hole causes poor front lockup
This 2nd pic shows CIENER BDM RUGER
Note that I have aligned the bottom of each mag at the bottom of the locking lug.
You can see the lug on both the Ruger and Ciener mags are way taller and are the same height where as the BDM lug is less than have the size. The shorter lug on the BDM allows the BDM mag to incorrectly rock front to back
It is my opinion that the combination of the larger front hole and the shorter rear lug cause the BDM to not lock up correctly.
My only suggestion would be a side by side comparison of the three types of mags and to measure them out and come out with the needed changes.
Note the BDM lock-up hole is much, much bigger.
This larger hole and maybe misaligned hole causes poor front lockup
This 2nd pic shows CIENER BDM RUGER
Note that I have aligned the bottom of each mag at the bottom of the locking lug.
You can see the lug on both the Ruger and Ciener mags are way taller and are the same height where as the BDM lug is less than have the size. The shorter lug on the BDM allows the BDM mag to incorrectly rock front to back
It is my opinion that the combination of the larger front hole and the shorter rear lug cause the BDM to not lock up correctly.
My only suggestion would be a side by side comparison of the three types of mags and to measure them out and come out with the needed changes.
Last edited:
blackdogmachine
UZI Talk Life Member
new mag testing
I just got done testing extensively our old and new AC556/mini 14 mags in semi, burst and full auto in 2 guns. My findings are perfect fit and function on everything. Im not just saying this, they really did run good, in fact more reliable than my M16/.22. I really would not have any clue how to make any more changes to this mag to make it any better but Im still open to input.
Im posting a video in a minute.
I just got done testing extensively our old and new AC556/mini 14 mags in semi, burst and full auto in 2 guns. My findings are perfect fit and function on everything. Im not just saying this, they really did run good, in fact more reliable than my M16/.22. I really would not have any clue how to make any more changes to this mag to make it any better but Im still open to input.
Im posting a video in a minute.
blackdogmachine
UZI Talk Life Member
video link
Here it is
http://www.youtube.com/watch?v=LNdj29DZ6Gg
Here it is
http://www.youtube.com/watch?v=LNdj29DZ6Gg
blackdogmachine
UZI Talk Life Member
fit
If you test fit with out the .22 kit in they move around, up and down alot. With the .22 kit the mag sit under the chamber adapter and stops it. The size of the front hole does not matter because all it does is hold the mag up under the adapter. Ineeded to move the hole up .025 and did this by making a larger hole(faster mold mod). The side to side fit is perfect being .010 thinner. The rear lockup is in the same place just thinner. I coulnt get them to fail and they loves the American Eagle ammo I was using. I have 3 kits, 2 guns, 1 in semi and the F/A AC556. The bolt hold open was working good too. The only thing else I did was trim the right feed lip back (made it the same as the left lip) I got better empty ejection by doing that. You guys let me know if I missed something.
If you test fit with out the .22 kit in they move around, up and down alot. With the .22 kit the mag sit under the chamber adapter and stops it. The size of the front hole does not matter because all it does is hold the mag up under the adapter. Ineeded to move the hole up .025 and did this by making a larger hole(faster mold mod). The side to side fit is perfect being .010 thinner. The rear lockup is in the same place just thinner. I coulnt get them to fail and they loves the American Eagle ammo I was using. I have 3 kits, 2 guns, 1 in semi and the F/A AC556. The bolt hold open was working good too. The only thing else I did was trim the right feed lip back (made it the same as the left lip) I got better empty ejection by doing that. You guys let me know if I missed something.
Well my two test mags are now spitting out 100% FA fire.
I added a tiny bit of epoxy to make the front hole just a bit smaller.
It does look like you moved up the hole by making the hole larger. I just added some epoxy and now the hole is perfect for me.
I think people will be very pleased with these mags.
I added a tiny bit of epoxy to make the front hole just a bit smaller.
It does look like you moved up the hole by making the hole larger. I just added some epoxy and now the hole is perfect for me.
I think people will be very pleased with these mags.
blackdogmachine
UZI Talk Life Member
drum
as a experiment Im going to modify a AR tower to work in the AC556, I will post the results, function and how much work to do it.
as a experiment Im going to modify a AR tower to work in the AC556, I will post the results, function and how much work to do it.
blackdogmachine said:
Kevin, I've got several of your original release AC556 mags (they only needed the sides sanded to fit and lock up in my receiver) and they run dry way too quickly. A 50 round drum is good; 100 or more rounds is better.
John C in PA
blackdogmachine
UZI Talk Life Member
did you guys see my video? is in the other post!
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