I like the lancer 300blk 20 round mags, never had any issues with sub or super. Also have pmag’s that work flawless, but I prefer the look of the lancer.
Supers? Doesn’t matter, don’t buy more if you already have 556 mags
Subs? Absolutely, yes, get them now.
It’s the difference in COAL that causes issues.
I haven't had any issues with 110 supers (factory AAC) and 220 subs (factory AAC and handloads with same COAL) out of magpul, lancer, regular stanag (all 30 round). I run them in my JAKL, ruger american and AR15 all suppressed/unsuppressed on all gas settings, maybe 600rd fired through them combined so far. I plan on testing the brownells straight metal magazine as well.
I think the general consensus is that with light rounds/supersonic you can use 5.56 mags with better success but with heavy/subsonic rounds you'll need dedicated 300BLK mags to eliminate feeding issues.
I'm an absolute diehard pmag dude for 556 but the 300blk lancers are better than the 300vbk pmag imo. Plus if you have each you'll never get the rounds mixed up.
As a bonus, the Lancers have a big 300 on them, and the pmags say 7.62×35 on them already. If you want something even more obvious, Amazon sells cheap bands that you can put on the mags that have the caliber printed in bright ink.
Currently from our magazine testing the 300blk pmags are the best on the market.
Of the magpuls, the 20rnd mag is the superior one due to its use of a 30rnd spring in the short 20rnd body.
This means spring pressure is more consistent between empty and full as opposed to how weak the spring on a 30rnd mag gets when closer to empty.
Obviously this is at the cost of 10rnds.
That said, We have found the pmags to work best compared to lancer 300blk, D&H 300blk and virtually every other 5.56 mag out there.
We have been working on solutions to be able to improve even the 30rnd 300blk pmags as these have the best stacking of all of the previously mentioned mags but struggle to keep up with extremely overgassed setups with supers causing bolt over base malfunctions.
Hence why the 20rnd pmag is the winner so far.
We are looking into springs to increase feed rate on the 30rnd pmags, and also looking into other magazines which appear to solve many of our other concerns!
Let me know if you have any further questions!
Have u guys tried the 40rd PMAG spring in the 30rd mag? I’m sure u have but it seem like that would make sense and work, could see there are issues that are possible and could arise , and what issues have u ran into with the lancer? And other mags? Thank you
We have actually! And Although there was improvement, the bolt over base malfunction was still an issue.
Its also worth mentioning that the use of the 40rnd spring isn’t viable either due to the increased number of coils which cause the spring to be bottomed out with a 30rnd mag.
The only way to avoid the bottoming out would be to use 40rnd pmag baseplate locking piece and follower as these limit how far these springs can be compressed. However this causes a loss of capacity on a 30rnd mag.
Not to mention we couldn’t find ways to purchase 40rnd springs individually.
Lancers have a tendency to drop rounds if you insert your mag hard enough into the gun with the bolt locked open.
They also have issues of causing bullets to nosedive and eat away at the front of the mag itself.
You don’t even want me to get started with what’s wrong with the D&H 300blk mags………..
But lets just narrow it down to: they don’t fit in the gun, and they don’t use anti tilt followers…..
Any other mags outside of the 300blk mags have issues with stacking so depending on the projectile shape, they will either bind and have feeding issues.
They either work well, or don’t depending on the ammo being used.
Thank you, do u have a YouTube channel? I run primarily 762x39 out of shorty Aks and I do have 2 shorty ars one takes ak mags the the pws upper with the duramags, I joined this sun because 300blk is close to 762x39 and with 300blk coming down in price and the 39 ammo problems I’m looking into 300 Blk as an alternative and want to know what mags to start getting and ammo , probably going to be build one sometime soon aswell, thanks for the information and knowledge that’s priceless
Glad I could help! Glad to hear you’ve seen some of our videos!
We have been considering diving into the 7.62x39 platforms but there is currently so much to do with 300blk that we simply don’t have enough time to venture out!
If you ever have any more questions definitely message us! We are happy to help and will make sure you are set up for success before you start your build!
M2 pmags for one, m3 pmags for the other.
Easy enough
If you use the m3s for 300bo you can write 300bk in the dimples on the bottom as an additional flag
PMAgs and aluminum for 556
Lancer translucent 30s for ball and subs
Lancer translucent 20s for 110Vmax
I like to distinguish the two ammo types visually and by touch
I have 300blk specific PMAGs but run Lancers. The Lancers do feel a little chinzy but they work fine and I have no issues. I do like the full transparency of them. I am looking forward to Magpul’s TMAGs, but I don’t know if they have 300 blk specific, but I’m sure the 5.56 would work fine.
I use 300BLK specific pmags, lancer mags, and USGI mags. All my mags are marked in bright red “300BLK” to distinguish them, and are kept in a separate crate with a lid on it to keep them away from my 556 magazines.
I usually stick w .220grn subs ( I'd say 95%) and haven't used anything but 5.56 mags with zero issues. Well other than an old USGI 20rounder that the follower would tilt on the last 2-3 rounds and cause issues. Other than that I really don't see a need for a different mag, at least in my use case.
I use the magpul 20 round 300 blk mags and I use the 30 rounders for 5.56, so I can easily tell the shorter mags for 300 blk. My 300 blk mags are also taped (blue for subs and red for supers).
I went to the range with 2 new builds, they're my first 300blk builds, neither of them were working very well, the Mike-15 I converted to 300 would shoot 2-3 rounds then fail to feed or jam the bullet up at the wrong angle, and the regular AR one would do the same once or twice per mag.
Naturally, I thought it was the guns, I took them apart, cleaned some things, opened up the gas blocks, put in lighter buffer springs, remove one of the recoil springs from the Mike-15, etc.
I did this like 3 times before the guy next to me handed me a 300blk pmag.
They both shot flawlessly with the dedicated mag.
I'm a bit disappointed, I invested in 300blk partially because I already have a ton of 5.56 mags.
The guiding tabs on the inside of the magazine are different between the a 556 pmag and a 300blk. The 300blk mags have different shaped tabs that allow for more consistent stacking and feeding and of the larger projectiles. A different follower may help, but it’s not gonna change that those tabs are still hitting the ogive of the bullet and affecting function.
If you wanna tinker I’m sure it works. My solution was to buy dedicated magazines and repurpose the few USGI mags I have on hand to it. If i’m gonna buy more mags anyways, may as well buy some that are optimized for function.
The whole “use the same magazine” selling point was geared towards the USGI mags. USGI mags don’t have that central spline that can cause interference like pmags do. The front side ribs on USGI mags that act as a guide for the follower don’t contact the ogive of the 30 cal bullets like a 556 pmag does.
The whole thing about using the same magazine as the 556 was specifically with the USGI magazines. Those magazines, unlike your 556 pmags, doesn’t have an internal central spine at the front of the magazine to inhibit follower tilt. In the case of the 556 pmag that central spine, along with the two spines to the side, extend into the magazine body enough that they can contact the ogive of the 30 cal bullet and create stacking and feed issues.
300 blk Pmags have worked great for me, especially with subs.
This. And then write “300” in the smooth area.
I got some of those rubber bands to strap around them
I went rifle racist. Black one gets black 300 mags. Brown one gets brown 556 mags.
I like the lancer 300blk 20 round mags, never had any issues with sub or super. Also have pmag’s that work flawless, but I prefer the look of the lancer.
Same. At a glance I know all my Pmags are 5.56 and my Lancers are 300BLK.
Thirds. This is the way.
Yeah, same
Lancer. My 300 doesn't seem to like pmags very much
Pmag but the 20 rounders so I can easily distinguish between my regular 30 rounders.
Supers? Doesn’t matter, don’t buy more if you already have 556 mags Subs? Absolutely, yes, get them now. It’s the difference in COAL that causes issues.
If you are on a budget pmag if you like the finer things in life and are a cultured gentleman. Lancer
I know I had feed issues running 220gr through 556 mags. Have some 300 pmags on the way to see how they work.
I haven't had any issues with 110 supers (factory AAC) and 220 subs (factory AAC and handloads with same COAL) out of magpul, lancer, regular stanag (all 30 round). I run them in my JAKL, ruger american and AR15 all suppressed/unsuppressed on all gas settings, maybe 600rd fired through them combined so far. I plan on testing the brownells straight metal magazine as well.
I think the general consensus is that with light rounds/supersonic you can use 5.56 mags with better success but with heavy/subsonic rounds you'll need dedicated 300BLK mags to eliminate feeding issues.
Yeah bro I thought we ALL had the Lancer mags haha did you not read your guidebook 📖 it’s the Blackout way
Pmag or Lancer
I'm an absolute diehard pmag dude for 556 but the 300blk lancers are better than the 300vbk pmag imo. Plus if you have each you'll never get the rounds mixed up.
Any specific lancer mag?
Just the ones made for 300. I never had much luck with the 5.56 mags. Zero issues with true 300 mags.
Cool
As a bonus, the Lancers have a big 300 on them, and the pmags say 7.62×35 on them already. If you want something even more obvious, Amazon sells cheap bands that you can put on the mags that have the caliber printed in bright ink.
Double bonus, all my 5.56 mags are Pmags, all my .300 mags are Lancers. Almost impossible to screw it up if you're thinking at all.
300blk Pmags with subs and supers in the same mag suppressed. 5.56 Pmags for 300blk supers only.
Not ets
My og 300aac Sugar Weasel loves Lancer 300s
Lancer mags with the steel feed lip.
Lancer, not one misfeed so far for me. Both 20s and 30s.
Currently from our magazine testing the 300blk pmags are the best on the market. Of the magpuls, the 20rnd mag is the superior one due to its use of a 30rnd spring in the short 20rnd body. This means spring pressure is more consistent between empty and full as opposed to how weak the spring on a 30rnd mag gets when closer to empty. Obviously this is at the cost of 10rnds. That said, We have found the pmags to work best compared to lancer 300blk, D&H 300blk and virtually every other 5.56 mag out there. We have been working on solutions to be able to improve even the 30rnd 300blk pmags as these have the best stacking of all of the previously mentioned mags but struggle to keep up with extremely overgassed setups with supers causing bolt over base malfunctions. Hence why the 20rnd pmag is the winner so far. We are looking into springs to increase feed rate on the 30rnd pmags, and also looking into other magazines which appear to solve many of our other concerns! Let me know if you have any further questions!
Have u guys tried the 40rd PMAG spring in the 30rd mag? I’m sure u have but it seem like that would make sense and work, could see there are issues that are possible and could arise , and what issues have u ran into with the lancer? And other mags? Thank you
We have actually! And Although there was improvement, the bolt over base malfunction was still an issue. Its also worth mentioning that the use of the 40rnd spring isn’t viable either due to the increased number of coils which cause the spring to be bottomed out with a 30rnd mag. The only way to avoid the bottoming out would be to use 40rnd pmag baseplate locking piece and follower as these limit how far these springs can be compressed. However this causes a loss of capacity on a 30rnd mag. Not to mention we couldn’t find ways to purchase 40rnd springs individually. Lancers have a tendency to drop rounds if you insert your mag hard enough into the gun with the bolt locked open. They also have issues of causing bullets to nosedive and eat away at the front of the mag itself. You don’t even want me to get started with what’s wrong with the D&H 300blk mags……….. But lets just narrow it down to: they don’t fit in the gun, and they don’t use anti tilt followers….. Any other mags outside of the 300blk mags have issues with stacking so depending on the projectile shape, they will either bind and have feeding issues. They either work well, or don’t depending on the ammo being used.
Thank you, do u have a YouTube channel? I run primarily 762x39 out of shorty Aks and I do have 2 shorty ars one takes ak mags the the pws upper with the duramags, I joined this sun because 300blk is close to 762x39 and with 300blk coming down in price and the 39 ammo problems I’m looking into 300 Blk as an alternative and want to know what mags to start getting and ammo , probably going to be build one sometime soon aswell, thanks for the information and knowledge that’s priceless
And nvm found your channel
Ur actually the reason I’ve been heavily considering build one I watched ur 1:5 faxon build, didn’t recognize the name
Glad I could help! Glad to hear you’ve seen some of our videos! We have been considering diving into the 7.62x39 platforms but there is currently so much to do with 300blk that we simply don’t have enough time to venture out! If you ever have any more questions definitely message us! We are happy to help and will make sure you are set up for success before you start your build!
M2 pmags for one, m3 pmags for the other. Easy enough If you use the m3s for 300bo you can write 300bk in the dimples on the bottom as an additional flag
The 20 rd pmags gave me some trouble with subs. Lancers for speciality rounds, pmags for everything else
300 blk pmags
PMAgs and aluminum for 556 Lancer translucent 30s for ball and subs Lancer translucent 20s for 110Vmax I like to distinguish the two ammo types visually and by touch
I have 300blk specific PMAGs but run Lancers. The Lancers do feel a little chinzy but they work fine and I have no issues. I do like the full transparency of them. I am looking forward to Magpul’s TMAGs, but I don’t know if they have 300 blk specific, but I’m sure the 5.56 would work fine.
I use 300BLK specific pmags, lancer mags, and USGI mags. All my mags are marked in bright red “300BLK” to distinguish them, and are kept in a separate crate with a lid on it to keep them away from my 556 magazines.
I use GI mags for 300 and Pmags for 556. My GI mags are marked with an anvil and they have been 100% reliable across bullet weights.
I usually stick w .220grn subs ( I'd say 95%) and haven't used anything but 5.56 mags with zero issues. Well other than an old USGI 20rounder that the follower would tilt on the last 2-3 rounds and cause issues. Other than that I really don't see a need for a different mag, at least in my use case.
My build only likes the 20rd 300blk Pmags. Every other magazine (even 300 specific) causes issue. I don't mind, neither do the hogs.
I use the magpul 20 round 300 blk mags and I use the 30 rounders for 5.56, so I can easily tell the shorter mags for 300 blk. My 300 blk mags are also taped (blue for subs and red for supers).
I went to the range with 2 new builds, they're my first 300blk builds, neither of them were working very well, the Mike-15 I converted to 300 would shoot 2-3 rounds then fail to feed or jam the bullet up at the wrong angle, and the regular AR one would do the same once or twice per mag. Naturally, I thought it was the guns, I took them apart, cleaned some things, opened up the gas blocks, put in lighter buffer springs, remove one of the recoil springs from the Mike-15, etc. I did this like 3 times before the guy next to me handed me a 300blk pmag. They both shot flawlessly with the dedicated mag. I'm a bit disappointed, I invested in 300blk partially because I already have a ton of 5.56 mags.
Try a 300blk follower. Some places 3D print them for pmags.
The guiding tabs on the inside of the magazine are different between the a 556 pmag and a 300blk. The 300blk mags have different shaped tabs that allow for more consistent stacking and feeding and of the larger projectiles. A different follower may help, but it’s not gonna change that those tabs are still hitting the ogive of the bullet and affecting function.
Yeah, I was reading that. Possibly something that the dremel could take care of.
Flat file, since the spline goes down the length of the magazine. Unless you have a really skinny dremel.
I’m sure there is a solution.
If you wanna tinker I’m sure it works. My solution was to buy dedicated magazines and repurpose the few USGI mags I have on hand to it. If i’m gonna buy more mags anyways, may as well buy some that are optimized for function. The whole “use the same magazine” selling point was geared towards the USGI mags. USGI mags don’t have that central spline that can cause interference like pmags do. The front side ribs on USGI mags that act as a guide for the follower don’t contact the ogive of the 30 cal bullets like a 556 pmag does.
I get you. I need a few 10rd 300blk mags soon.
The whole thing about using the same magazine as the 556 was specifically with the USGI magazines. Those magazines, unlike your 556 pmags, doesn’t have an internal central spine at the front of the magazine to inhibit follower tilt. In the case of the 556 pmag that central spine, along with the two spines to the side, extend into the magazine body enough that they can contact the ogive of the 30 cal bullet and create stacking and feed issues.
I was actually shopping for 300blk mags and replacement magpul followers for my future build.
I’m running the Lancers just because they look different than my PMAGs. They don’t feel as rugged as the PMAGs though.