FITTING IN GENERAL: Remember that these devices are designed to be used with standard grips which leave the front strap exposed. They do NOT work with grips that fill in or cover any of the metal behind the trigger guard or on the front of the grip frame.
The 2-clip design means that, initially, the adapter may not seem to fit as straight on the grip frame as the older single clip models. This can happen because of imperfect alignment between the two clips. (Sorry about that.) For the best fit, as you tighten the grip screw, be sure to hold the adapter tightly against the wood grips and against the curve of the frame above and behind the trigger guard. When the grips are tightened down on all of the clips, this will insure that the adapter is locked solidly in place against the metal and wood, where it’s supposed to be.
FITTING FOR S&W J FRAMES: There was an early report of poor fitting on an M&P 340 Scandium frame model, but I have not had subsequent reports of problems. You can check this thread for the discussion that went on during initial development of these adapters, and for photos of the fit on various J frame guns: http://smith-wessonforum.com/s-w-revolvers-1980-present/195543-bk-grip-adapters.html
FITTING FOR S&W K, L and N FRAMES: The larger S&W adapter was made for square butt K frames. The prototypers found that it also fit round butt K frames, and both square and round butt N frames. L frame guns use K frame grips, so they should be taken care of as well. (X frame shooters – well, I assume you’re not using Magna grips, so these are not for you.) You can check this thread for for the discussion that accompanied the initial testing of the K frame adapters on various guns, and for photos of the fit on various K and N frame guns: http://smith-wessonforum.com/s-w-revolvers-1980-present/200044-bk-grip-adapters-square-butt-k-frame-prototypers-wanted.html
Two customers have fitted the K adapter to a Model 12, the lightweight K frame model whose frontstrap is 2mm narrower than “regular” K frames. Both report that the adapter fits just fine.
FITTING FOR COLT D FRAMES: The D adapters are tested for fit on a Detective Special with the long grip frame – where the frame is visible all the way around the grip panels. They have also been checked and fit properly on a Detective Special with the short grip frame – the lower clip engages the frame, and does not interfere with the segments of the grip panels that wrap under the bottom of the frame. They have not been checked on other D frame Colts, but there is no reason to think they will not fit properly on those guns as well.
One customer has advised that the D adapters also fit properly on his E frame Officer’s Model, and his photos confirm this. Another customer has found that the D adapters fit properly on the large frame New Service model, again with confirming photos. Also, be aware that there were early, smaller Police Positive and Banker’s Special frames which are sometimes referred to as “D” frames but which are NOT the same size as the later, larger Police Positive Special/Detective Special frame, and the D adapters do NOT fit properly on these earlier, smaller frames. The early guns have a cylinder which is ~1.25″ long, while the later, larger guns have a cylinder which is ~1.56″ long.
FITTING OTHER MODELS: One customer reports that the K adapter (I think it was) fits at least OK on an old H&R 38 Hammerless model. Another customer reports that the K adapter fits properly on a pre model 82 Taurus, sometimes known as The Falcon. And there is a post on a Taurus forum reporting that the K adapter fits fine on a Taurus 80.
Customers have reported that the J adapter fits properly on Taurus models 605 and 85. Other customers have reported that a J adapter fits the Rossi M68 and M88 models. The J adapter is supposed to fit properly on many Charter revolvers, and customers have reported success with the Undercover, Off Duty and Bulldog models. But I can’t guarantee that a J adapter fits on all Charter revolvers, and I don’t have a specific list of compatible models to offer.