I had to check to be sure I hadn't previously posted already as I'd probably expressed my opinion on alternate-brand mags on other threads/forums.
Magpul is my go-to AR15 mag, whether M2/M3/M3 w/window. All work in my two AR15s (Springfield and BCM brands). I understand Magpul is generally used/issued for M16/M4 AR-type rifles in the USMC; unknown to me regarding other US service branches.
The Magpul Glock mags were only so-so, with some premature slide lock-backs or bunching of steel-cased ammo (ammo column constipating the rounds feeding upward); all depending on which Glock and what ammo being used. I admit steel-cased ammo isn't shot by everybody and not generally used for carry ammo, but I've used it quite often in 9mm form.
I've found Magpul's Glock mags to have weaker springs than stock, and the per mag price difference to not be enough of a financial factor for me to deviate from Glock's own brand. Positives to the Magpul Glock mags is I like how easy they are to disassemble and Glock-brand mag springs can be used in a Magpul Glock mag if desired.
I've zero experience with the ETS company product(s).
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