The Traditions Frontier series is just a rebranded line of standard Pietta 1873 revolvers. Pietta offers these guns in all of the standard calibers.
(.22 LR, .357 Magnum, .44-40, .45 Colt. and .44 Magnum).
Pietta produces 2 variations of their 1873.
The Pietta standard model has a traditional hammer-mounted firing pin, typical push-button cylinder pin release, color case hardening, a standard length grip frame and a one-piece walnut grip, although PVC 2 piece grip models are available in black or white hard molded rubber style, faux ivory, and faux stag, and a checkered walnut one-piece grip is also available.
The other 1873 Pietta model is modified with a transfer bar in a similar way that Ruger modifies old 3 screw Blackhawks.
The hammer face is flat and a bit odd looking when cocked.
The .44 magnum version that Traditions offers has a standard length grip frame, the transfer bar, the one-piece smooth walnut grip, and the standard 3 barrel lengths.
All of these revolvers have the traditional Colt SAA fixed sights including the .44 magnum.
Pietta quality is very good these days, with very good machining, nice color case hardening, a very nice finish, and decent walnut grips.
Side by side, Uberti, revolvers are a bit better in all of these departments, but then they cost significantly more too.
On You-Tube, duelist1954 has a shooting review video of an 1873 Traditions (Pietta) revolver entitled "Traditions Single Action Army Revolver".
Both the revolver fit and finish and the accuracy looks pretty decent.