BCM Lower not compatible with PMAG Gen3

[17K]

Err, fixed what, and is there a mag revision id?

The second round crossing up with the top round. There was a guide nub added inside the feedlips of the Gen M3 30s sometime in the first half of 2016.

[Chris Bonesteel]

Cant blame bcm for not wanting to warranty lowers that meet mil spec but are not compatible with aftermarket magazines, however it is totally mind boggling that they wouldnt adjust their specs to fit extremely popular magazines after the issue had come to light, adding one more cut to the operation couldnt possibly add enough expense to justify the alienation of gen 3 pmag users

[17K]

Apparently the M3s are Mil-Spec enough to have no issues in actual military M27s and M4s.

If a certain percentage of the USMC's lowers didn't work with the M3, they certainly wouldn't have become issued mags.

[ruckusjuice]

I’m also surprised that BCM hasn’t adjusted the range of acceptable tolerances for the area at the front of the trigger guard to always accept Gen M3 PMags. Now that these magazines are issued by the Army, Marine Corps and Air Force, I can’t see any justification that a lower doesn’t need to be able to function with them. Soon Gen M3 Pmags will be as ubiquitous as the aluminum GI magazine.

The early Gen M3 Pmags did sometimes have issues with the tip of the second round moving upwards making it very difficult to lock the mag in under a closed bolt. Magpul has since fixed the issue as already noted. All Sand and MCT mags, and all black mags made from 2016 and later have the additional ribs in front of the feed lips to prevent this issue.

[Chris Bonesteel]

Thats the thing with specs, they are what they are until theyre changed. People confuse spec with compatibility all the time

[markm]

I'm going to call Toyota and bitch about my Tacoma not being compatible with aftermarket rims.

[Sparky5019]

I'm going to call Toyota and bitch about my Tacoma not being compatible with aftermarket rims.

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[MorphCross]

I'm going to call Toyota and bitch about my Tacoma not being compatible with aftermarket rims.

I wouldn't say it is a 100% accurate analogy however the sentiment is on point.

Doesn't "standardizing" on a magazine that is optimized to work on Colt Lowers alone defeat the purpose of STANAG 4179 which is all about interoperability between allied NATO forces?

Also why does it matter when an end user can rework a little bit of polymer to resolve the issue?

[Sparky5019]

I wouldn't say it is a 100% accurate analogy however the sentiment is on point.

Doesn't "standardizing" on a magazine that is optimized to work on Colt Lowers alone defeat the purpose of STANAG 4179 which is all about interoperability between allied NATO forces?

Also why does it matter when an end user can rework a little bit of polymer to resolve the issue?

Maybe I should have expounded more...🤦🏼


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[LMT/556]

The second round crossing up with the top round. There was a guide nub added inside the feedlips of the Gen M3 30s sometime in the first half of 2016.

Thank you, I have both on hand.