I have bought both a 4" (SKU 163603) and a 6" (163606) 629-6 brand new within the last three years. They have been among the best revolvers I have ever had the pleasure to own and shoot. I have shot everything from ferret flatulance homebrew loads in .44 Russian cases to a mix of .44 Specials and up to some hot factory 180gr UMC, amongst other, Magnums. Both of mine sport the S&W Accessories '.500 Magnum Hogue monogrips', OEM grips on the S&W .460 & .500 Magnum revolvers. That grip fits K/L, X, & N-frames equally well - and does absorb some of the recoil, while the moderate muzzle rise persists with hot loads. Still, the grips make the 4" a great protective shooter - and the 6" like a rifle. Stay within factory loads and you'll have a long life together.
As far as the Infernal Lock is concerned, my worries are elsewhere. I have a few so-equipped - and many thousands of rounds sent downrange. I have never had a problem. I even have a 642-2 in my pocket - a 642 with the IL. The only concern is the price - that's more than the 6"-er, the same MSRP as the 4" both then and now, cost me three years back - brand new! Of course, they are more now... and if it is in decent shape, it may be a deal.
BTW, my 4" 629 replaced my 629 Mountain Gun - a 4" style I loved. I like the standard 4" 629 better now - it has a larger hammer & trigger, better frt/rear sights, and, even with a full sized partially lugged barrel, only weighs two ounces more than the 629MG. Those grips I mentioned are great for real Magnums. If it's a good gun - and the price seems fair - go for it!
Stainz
