The reason I asked... When I looked at the photos of the MD-2 and MD-4 on Sticky's website, there was a stitch sewn on the MD-4 that looked like it might interfere with a laser-equipped Shield. (their fitment guide lists both MD-2 and MD-4 for the Shield, but "with laser" is included in the MD-2 description)
When I placed my order, I ordered the MD-2, but in the comments box I stated "for Shield 40, likely will add Lasermax to it. I see the MD-4 fits in addition to the MD-2, but the MD-4 sewn cut looks like it won't accept the lasers while the MD-2 will."
When the holster arrived, it was a MD-4. On the packing slip, MD-2 was marked out with "MD-4 straight line" added.
My Shield is still in the S&W/distributor blackhole, so I have no idea when I'll get to test-fit it, but my SW990Lc fits the MD-4 "straight line" just fine. It's roughly the same size as a G27 or M&Pc. The Shields are a tad shorter in length, so I think the rear sights will end up just inside the holster, and the Lasermax should fit just fine, too.
I pocket carried that fat 990Lc one evening with the Sticky. I was surprised at the comfort considering I don't like putting my cell phone in my jeans pocket. There may be hope afterall pocket carrying my Shield with the Sticky and the right pants. I definitely prefer how the Sticky material is thinner than the Remora material.