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As I mentioned in the 3rd Gen thread, I got the four 4th generation Blackdog magazines in on Monday, and took them to the range, loaded up with Blazer ammo. The mags are listed as 26 round, but I could only get 25 in without denting cases. Some break in may be required...
Fit in SU/PLR-22 is very nice, and also with my Nordic Components AR-22 upper. There is actually some space between the respective ejectors and the top of the feed lips. I had concluded that this might have been the cause of the function problems I had with the 3rd Gen mags and two Nordic Components AR uppers. In the guns I tried them in, the spent cases look like they will clear the mag feed lips and actually strike the ejector. Insertion is very easy, as there is a ramp for the mag catch. When the follower is not holding the bolt, they actually drop free, even from the Kel Tecs, which typically have tight mag wells.
Performance in both my SU-22 and PLR-22 was flawless. I really don't know what else to say.
Likewise, performance in the AR I tried was flawless as well.
The feed lips on mine are the cast stainless steel. They will also be available with glass-filled nylon feed lips. The two types of feed lips are interchangeable. Both of these materials are more resistant to heat and chemical attack than is polycarbonate. The bodies on mine (smoke-colored) are polycarbonate. The black magazines supposedly have glass-filled nylon bodies.
The only cons I see in these are that they don't hold 26 rounds (big deal, they hold 25, which is half a box) and they don't have the follower pull down like the third gen mags. On the other hand, this lack of a pull down means there are fewer openings for dirt and debris to enter. They lack the notch at the middle of the feed lips and this makes them marginally more difficult to load than the 2nd gen.
The magazines, from left to right: 2nd Gen, 3rd Gen and two 4th Gen mags, along with my SU-22, and the grip of the PLR-22.
Clockwise from bottom left: 3rd Gen, 2nd Gen, 4th Gen
View of the mag catch "ramp" of the 4th Gen mag
Same view of 2nd Gen mag showing lack of ramp
I am pleased with these magazines and am really happy that they work in all the guns I've tried them in. These are, in my mind, a worthy successor to the 2nd Gen mags. Now they need to come out with a drum tower compatible with these feed lips.
buzzsaw
Fit in SU/PLR-22 is very nice, and also with my Nordic Components AR-22 upper. There is actually some space between the respective ejectors and the top of the feed lips. I had concluded that this might have been the cause of the function problems I had with the 3rd Gen mags and two Nordic Components AR uppers. In the guns I tried them in, the spent cases look like they will clear the mag feed lips and actually strike the ejector. Insertion is very easy, as there is a ramp for the mag catch. When the follower is not holding the bolt, they actually drop free, even from the Kel Tecs, which typically have tight mag wells.
Performance in both my SU-22 and PLR-22 was flawless. I really don't know what else to say.
The feed lips on mine are the cast stainless steel. They will also be available with glass-filled nylon feed lips. The two types of feed lips are interchangeable. Both of these materials are more resistant to heat and chemical attack than is polycarbonate. The bodies on mine (smoke-colored) are polycarbonate. The black magazines supposedly have glass-filled nylon bodies.
The only cons I see in these are that they don't hold 26 rounds (big deal, they hold 25, which is half a box) and they don't have the follower pull down like the third gen mags. On the other hand, this lack of a pull down means there are fewer openings for dirt and debris to enter. They lack the notch at the middle of the feed lips and this makes them marginally more difficult to load than the 2nd gen.
The magazines, from left to right: 2nd Gen, 3rd Gen and two 4th Gen mags, along with my SU-22, and the grip of the PLR-22.

Clockwise from bottom left: 3rd Gen, 2nd Gen, 4th Gen

View of the mag catch "ramp" of the 4th Gen mag

Same view of 2nd Gen mag showing lack of ramp

I am pleased with these magazines and am really happy that they work in all the guns I've tried them in. These are, in my mind, a worthy successor to the 2nd Gen mags. Now they need to come out with a drum tower compatible with these feed lips.
buzzsaw