Not sure I ever tried a gen 3. Really I probably have only put a 30 in my guns for live fire a handful of times in the past 10 years. Mostly run Colt/NHMTG 20s. I should get up off the shooting mat more often.
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I find the 30's to be perfect monopods when shooting prone.
40's are great for that with armor on.
I have really embraced the mag-as-a-monopod TTP lately, it works extremely well.
I would probably choose the new Lancer L5AWM *Gen 2* mags over this new and improved VLTOR mag and will probably pick up 6 or 7 of the Gen 2 20rd mags when they become available in June.
https://lancer-systems.com/product/l...ound-magazine/
Bagging is better, but you won't get a bag in the military, and I've never detected any shift. Try it yourself sometime, it will produce a solid zero on a rack grade M4 with mil spec ammo, and mil spec fire control, an Acog or M68, working guns not precision outfits.
No, I've only shot this way out to 250 yards so far, but no discernible shift.
I consider it a "hurry up, get down & shoot" field position, and use bags front and rear when actually zeroing optics or irons, but yes, I've been surprised at how well it works, and how stable it makes prone unsupported.
And the old wives tales about it causing reliability issues were just that.