Why does XM5 6.8mm (MCX-Spear) use Lancer L7AWM but not PMAG 20rd mags?

[bfoosh006]

FWIW, Lancer L7AWM's have noticably heavier springs when compared to a PMAG 308... at least all mine do. Even after trimming a coil. ( Just as an experiment )

"Maybe" the higher cyclic speed likes a heavier mag spring to keep up ?

[Disciple]

EDIT: Wait, you say you retired in 2006? The first PMag prototypes were made in 2006, announced in 2007, and commercially released later that year/the next year. I remember the big hoopla over them being released because every gun store around Bragg was pushing them, and a few guys thought they were the greatest things ever, and indestructible... until we ran one over with an 1151.

No reply for this? OGmechanic goes on the ignore list.

[Defaultmp3]

FWIW, Lancer L7AWM's have noticably heavier springs when compared to a PMAG 308... at least all mine do. Even after trimming a coil. ( Just as an experiment )

"Maybe" the higher cyclic speed likes a heavier mag spring to keep up ?

Lancer did tell me that the heavier spring was for use with full auto. Not sure what in the USA military uses a large frame AR mag that is also full auto, so that claim never did make much sense to me.

I'll also note that SIG apparently has plans to try to transition to steel mags for the M5, though the Army hasn't approved that yet: https://soldiersystems.net/2022/07/2...on-capability/

[bfoosh006]

Lancer did tell me that the heavier spring was for use with full auto. Not sure what in the USA military uses a large frame AR mag that is also full auto, so that claim never did make much sense to me.

I'll also note that SIG apparently has plans to try to transition to steel mags for the M5, though the Army hasn't approved that yet: https://soldiersystems.net/2022/07/2...on-capability/

Thank you for sharing, I wasn't aware SIG was developing a steel mag.