Just an FYI for those who purchase the AA 22LR conversion for their G19/G17 or Poly80 models. The standard Safariland ALS holsters will not fit. The slide on the AA kit is too wide to fit the ALS and the holster width as a whole. You can however run the holsters for the G20/G21 and they slide right in.

For reference, I have the P80 with a AA kit and TLR-1 which would not fit in the 6378 light bearing holster for G19. I picked up one for the G20/G21 and it fits really well.

Nomenclature wise, for the G20/G21 holster you would need to pick up (MODEL-FIREARM-COLOR) XXXX-383-XXX (MODEL-FIREARM-COLOR) for non-light bearing or XXXX-3832-XXX for light bearing guns

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Side note: I learned that the T-nuts for mounting the holster are an inch lower on the SLS type holsters, thus raising the gun an inch. I couldn't figure out why it felt so different until I put the 2 different holsters side by side

I have a AA conversion slide for my 19.3. I don't have a 19/23 Safariland holster, but it fits and locks in in on my 17/22 and 34/35 ALS holsters. It's a little tight, but maybe there's a little extra room because they're light bearing holsters.

I just re-read your post and realized you have a light bearing holster. Did you consider that the barrel plug in the holster is preventing it from seating all the way? Smaller caliber means smaller hole.

I just re-read your post and realized you have a light bearing holster. Did you consider that the barrel plug in the holster is preventing it from seating all the way? Smaller caliber means smaller hole.

Yeah I took the plug out first to see if that was holding it up, but the slide itself is super tight in the ALS. I can get it in, but it's hard to draw and insert.

i went and used a mic on the AA slide and it is 26.3mm vs the 25.5mm on the OEM G19. The OEM G20/G21 slide is 28.5 so it fits well and no issues with loss of retention.

I'm sure some of the problem is that I'm running it on a P80 frame having the trigger guard scallops and it's about an 1/8 wider than factory making it that much harder to insert in the holster. I went as far as removing the ALS entirely to see and it's still super tight.

The P80 won't fit at all in a non-light bearing G19 holster from Safariland because of the frame at the rails. I might just shave down the scallops to see what that does.

Right now I figure that if I have to work too hard at the draw and insertion, it won't be as safe due to the extra effort required. Don't need an ND.

***me throwing time and money at problems that don't need solving***