Problem with a 50rd drum under a TNW ASP (or ASR)

I bought one of CDNN's 9mm drums (most likely manufactured by SGM or KCI) while it was on sale a couple weeks ago, and it fits as expected in my TNW ASP (designed to use Glock mags), but it won't latch into place.

Anybody resolved this, or have ideas on how to modify the drum to latch?

Thanks in advance.
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I already have a couple OEM G17s and a half dozen KCI G17s. This purchase was made while CDNN had a drum and a 32-rounder combo for $49 and threw in a US Army knife. Too sweet a deal, if only for the pix of my ASP with threaded long-barrel, SB-15, and 'gat' mag . . . .


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