The SD 6" block cut slides will fit fine on a 4.3's frame, but without matching scalloping on the slide, it may look a bit awkward. That's a bit of a personal preference, though.
Also, realize that the 6" slides are built for use with the adjustable Bomar style rear sight found on the 5.1... NOT the 4.3. The 5.1 and 4.3 use different rear sights, and as such, the dovetail cut outs for each respective sight is different. You'll need to source out a 5.1 sight separately if you decide to go with the SD slide set.
Custom built slides can be made in 6" length with 4.3 dovetail cutouts if required... but are quite pricey. If budget is a concern, don't go the route of custom.
Last edited by ILLusion; March 5th, 2010 at 15:01..
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