I have 3 Burris fastfire-2, all on 1911's, one is on a Marvel 22 conversion. They work fine but the dot is sometimes too dim for bullseye shooting. the dot is invisible on the white target.

The new Fastfire-3 now has a top loader battery and brightness control. I tried it on the Marvel, I can see the dot on the white bullseye target background which I couldnt' before.

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I bought a few Elite (metalform) 8rnd 45acp mags for the 1911. They have plastic extended removable bottoms with a slight finger support and curved tubular followers. The metal mag body sits about an 1/8 proud of the magwell. They fed 185 and 200 swc target loads fine.

richj, it is not unusual for red dots to not be clearly visible against a white background, specially in bright sunlight. However if you are shooting bullseye, this should not be an issue! I do have some practice targets which have a white center but I do not use these for bullseye with a red dot.
Peter.

Indoors the old Fastfire is fine if you can find the black bullseye.

Also just a note, the cross pin is too fat for a Weaver base but works on a picatinny. I had to shim it out to fit the marvel. Apparently marvels base is narrower than weaver or picatinny.

Sorry richj, there is something here I don't understand. Are you shooting at a standard NRA Bullseye target? The black should not be hard to find!
I am not surprised about the red dot sight. Many of these are now made for the AR15 crowd which means a picatinny size rail. For bullseye pistol shooting I would stick with an Ultradot. The main reason is that the dot size on many AR15 style red dots is too big for pistol bullseye shooting. I don't think you want anything larger than a 2MOA dot for bullseye pistol shooting.
Peter.