You really don't need to do this for 30 round mags (and certain 20 round mags). I've use standard steel mags and Pmags and ive had no feeding issues or damage to feed lips (however i prefer the GI mags more) if i recall too the round itself was designed by alexander arms to work with unmodified STANG mags. The only time ive found myself having to modify a magazine was with steel 20 round box magazines. Any other 20 rounder works fine
Just curious, can you show me a 50 Beowulf specific mag that has a similar cut out? My initial problem with the polymer 80 was the last round continuously jamming and I was looking at that magazine and noting similar interference but then the thing emptied itself on the floor and I gave up on it.
The polymer magazines are shit mine does the same thing I can only load two rounds in it maybe three once I add the forth it vomits every last round out. I’m looking into steel magazines because I noticed that the polymer magazines lips like flare out so the magazine is not tight at the lips and any little bump all the bullets are on the floor.
@@eidtnaci I'm in NY so the mag must be pinned in place so you only get one shot at getting it right. Was hoping for a true 10 rounds. Steel doesn't give you that option that I am aware of. 20 round steel will get you 7 and 30 is too much hanging out there for me. Oh well.
Strangely enough the big bore magazines (.50 Beowulf, .450 Bushmaster and .458 Socom) don’t seem to have the relief cut like I am doing here. I think they must use a different follower angle and/or different angle of the feed lips to accommodate and “steer” the larger round into the chamber. On a standard AR mag a person may have good luck, but my experience is like yours…rounds either shoot out of the magazine like an expensive jack in the box, or they jam up during feeding and scratch the hell out of your brass. So far this is the best and lowest cost solution I have found to reliably feed these huge rounds.
It should. I would be a little worried about bulging of the polymer at the feed lips, but magpul does have a better polymer than the other one I tested. I think you should be good to go.
Runs great, no issues. I bought a cheapie upper from Bear Creek Arsenal and have had no problems with it. Now in fairness, it hasn’t had 1000’s of rounds through it due to the cost of ammo for this one….but what I have put through it has had no failures in feeding, ejecting, firing, etc…. No issues at all.
Bear creek's big bore line is mostly fine, the barrels are really well built however the only concern is the BCG extractor but you can buy a stronger 7.62 one. Their firing pins also have issue but I think swapping for a titanium one with a big bore round is a good idea
It’s called tolerance stacking. If yours work without issue, you are lucky indeed. But depending on the tolerances of the parts used, one may or may not have the same experience. I tried PMAG’s and Bulgarian Steel AR mags, and they just didn’t work quite right for me. Once the Bulgarian AR mags were modified as shown in the video above, I have had zero issues. Thanks for watching!
I only buy lancer 556/300blkout mags. They run 50 Beowulf flawlessly. I don’t even attempt with any other magazine.
You really don't need to do this for 30 round mags (and certain 20 round mags). I've use standard steel mags and Pmags and ive had no feeding issues or damage to feed lips (however i prefer the GI mags more) if i recall too the round itself was designed by alexander arms to work with unmodified STANG mags.
The only time ive found myself having to modify a magazine was with steel 20 round box magazines. Any other 20 rounder works fine
Just curious, can you show me a 50 Beowulf specific mag that has a similar cut out? My initial problem with the polymer 80 was the last round continuously jamming and I was looking at that magazine and noting similar interference but then the thing emptied itself on the floor and I gave up on it.
The polymer magazines are shit mine does the same thing I can only load two rounds in it maybe three once I add the forth it vomits every last round out. I’m looking into steel magazines because I noticed that the polymer magazines lips like flare out so the magazine is not tight at the lips and any little bump all the bullets are on the floor.
@@eidtnaci I'm in NY so the mag must be pinned in place so you only get one shot at getting it right. Was hoping for a true 10 rounds. Steel doesn't give you that option that I am aware of. 20 round steel will get you 7 and 30 is too much hanging out there for me. Oh well.
Strangely enough the big bore magazines (.50 Beowulf, .450 Bushmaster and .458 Socom) don’t seem to have the relief cut like I am doing here. I think they must use a different follower angle and/or different angle of the feed lips to accommodate and “steer” the larger round into the chamber.
On a standard AR mag a person may have good luck, but my experience is like yours…rounds either shoot out of the magazine like an expensive jack in the box, or they jam up during feeding and scratch the hell out of your brass.
So far this is the best and lowest cost solution I have found to reliably feed these huge rounds.
Would a magpul gen 3 with window for 5.56/.223 fit a cycle a 12.7x42 round?
It should. I would be a little worried about bulging of the polymer at the feed lips, but magpul does have a better polymer than the other one I tested. I think you should be good to go.
@@SMR-Tactical thanks. Didn’t know if i needed to change the follower or not. 💪🏽
Ahhh, I see. I don’t believe the follower would need to be changed. Should be good with the one that comes in there.
Is it running fine?also how much was your upper did it break the bank or have any issues
Runs great, no issues. I bought a cheapie upper from Bear Creek Arsenal and have had no problems with it. Now in fairness, it hasn’t had 1000’s of rounds through it due to the cost of ammo for this one….but what I have put through it has had no failures in feeding, ejecting, firing, etc…. No issues at all.
Bear creek's big bore line is mostly fine, the barrels are really well built however the only concern is the BCG extractor but you can buy a stronger 7.62 one. Their firing pins also have issue but I think swapping for a titanium one with a big bore round is a good idea
Standard pmags feed fine...
I must be lucky,my .223 mags work just fine 🙂
It’s called tolerance stacking. If yours work without issue, you are lucky indeed. But depending on the tolerances of the parts used, one may or may not have the same experience. I tried PMAG’s and Bulgarian Steel AR mags, and they just didn’t work quite right for me. Once the Bulgarian AR mags were modified as shown in the video above, I have had zero issues.
Thanks for watching!
@@SMR-Tactical mine are original Colt mags from the 80's,and yes I agree for the most part it's about tolerances but that is with anything