The Model 910 the "Value Series" version of the Model 5904, with less refined slide machining, no starboard-side decocker/safety lever, a plastic guide rod, and plastic sights. Later 910s were modified to lock up on the ejection port rather than using an internal barrel lug.
Most 59-series holsters will work. All standard 59-series magazines will work, including 20rd and 30rd mags made for the Marlin Camp 9 Carbine.
Metal guide rods from any 3rd-gen 59xx-series pistol are a drop-in swap. The pistol will accept slanted or Novak-style sights from a later 3rd-gen 59xx-series pistol; be aware that 3 styles of rear sight were used on the 59xx series – a vertical drift-adjustable blade, the Novaks, and a great big screw-adjustable unit – but the 3 styles are NOT mutually interchangeable because the rear dovetails are different sizes. Be careful to order the right ones!
BarryLee said:
My understanding is that it is sort of a budget version of the Third Generation semi-automatic, so does that impact reliability?
The only factor that impacts reliability is the use of a plastic rather than steel guide rod in the Value Series, and this doesn't impact function so much as ease of teardown and reassembly.
If you've never field-stripped and reassembled a S&W metal-frame auto pistol before, a lip on the end of the guide rod is retained under spring pressure by a remarkably narrow ledge under the barrel cam. The Value Series plastic guide rod lip can become rounded off and skip out of the ledge, potentially causing the guide rod to spontaneously fly out on disassembly and/or refuse to stay in place during reassembly.
This is not a problem with the standard steel guide rod, which is tough enough that it won't become rounded off unless you do something really stupid with it.
As noted above, the standard metal guide rod is a direct fit, although I'm not sure S&W will sell you one, as they have been restricting the sales of certain 3rd-gen parts to non-LE owners; however, new Model 5946s have recently appeared on Cabela's shelves (there's a recent thread on this), which bodes well for 59xx-series parts availability in general.
Lastly, IMHO $300 is pretty steep for a M910 with significant cosmetic wear and no accessories or box; however, the pistol would be a decent buy at $250 if it's in good mechanical shape.