It's not the magwell, it's my hand. If I put my support hand on the magwell, I pop the lever. Not an issue if using the handguard.
I don't think it's a design flaw, so much as something to be aware of.
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Gotcha. I'll take a look when I get off work. The lever doesn't go all the way up, but it does pop up enough, apparently, to cause issues.
BCM lower, FWIW.
Update: so the lever is blocked by the magwell, as per the above picture. However, when I use the magwell as a hand rest, my hand is able to push the lever enough to clear the lip of the magwell, inducing the FTF.
He doesn't if it impedes function but who uses a magwell hold these days?
I do. Most of my ARs have Mako magwell grips, except for my 5.56 carbine & pistol, because the D60 drum won't clear the magwell grip.
My carbine has the winter trigger guard so I can run the Ergo grip that's just a piece of rubber that slips around the magwell but doesn't hang below it.
The D60 fits fine in all my RRA, PSA & Anderson lowers but it's such a close fit any lower that's not 'milspec' like those with a flared magwell probably won't fit. I was looking at adding an aftermarket flared magwell to my 5.56 carbine til I remembered it wouldn't work with the drum.