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Do you want a post-lock S&W 686+ that has MIM? I've been having the same debate.....I really want the talo 3" with unfluted cyl. but I'm just not convinced Id like it.
I'm not being critical. If you are interested, $670 for that isn't a bad deal. IMHO the 3" model will hold its value better than the 4" will. Personally, I'd be interested in the 3" just because it would carry easier than the 4".
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pet peeve... The internet gun community really really needs to get over the MIM part thing. MIM is a 30+ year old technology that the gun industry adopted early. Yes there where issue early on while the technology went through its growing pains and the firearms engineers learned to use the fledgling technology. Those are both in the past, way in the past. MIM is used by nearly every firearms manufacture currently making firearms, Glock, SIG, S&W, Springfield Armory, Remington, Browning, etc. The technology is mature and the industry is into its second generation of designers that grew up with the technology. MIM parts are dimensionally much more consistent that investment cast or forged. Regular MIM parts are greater than 95% the density and material properties of the parent material. If the MIM parts are HIP'ed (High Isostatic Pressing) you have a hard time distinguishing it from a forged part of the same material as far as material properties go. MIM parts can capture features that forging and casting cannot and thus are often net shape ready to use requiring no post cast/forge machine operations. The are cheaper to make, dimensionally more consistent and have finished that are better than cast parts. MIM is hear to stay because it better and cheaper for many parts the firearms industry uses.
Probably freak you all out to know that nearly all S&W revolvers since ~1993 have been rifled using an electro-chemical process not cut, button or hammer forged.