The K series Frontier Scouts were introduced in 1960 and were finished in bright nickel plating. Serial numbering started with 1K. Receivers, grip frames and loading gates were made of Zamak alloy which was considerably heavier than the previously used aluminum. Barrel lengths and chamberings were the same as the F revolvers. All K series revolvers were fitted with plain walnut grips and most were shipped from the factory with wood presentation cases lined with red fabric. The cases were marked on the outside with an impressed Colt logo in the center of the lid and were "French-fitted". This consisted of gluing a cardboard cutout of the revolver in the bottom of the case and covering it with red cloth. Usually the cloth in the inside lid was red satin with the Colt logo in gold and red velvet was used for the bottom where the gun rested.
Beginning with the K series revolvers, Colt began shipping pairs of guns with consecutive serial numbers in addition to single revolvers. Pairs were two Frontier Scouts, a combination set with one Frontier Scout and one Buntline Scout or two Buntline Scouts. Calibers were mixed as well; some pairs were both .22 LR, some were both .22 Magnum and some were one gun of each caliber. After the first year or two of production, the logistics of maintaining consecutive serial numbers in pairs of guns became too time consuming and many pairs were shipped with non-consecutive serial numbers. In most cases, special wood presentation boxes for two revolvers were used. In ten years of production (1960 to 1970) about 44,000 revolvers were produced in the K serial number series.
As in the F series, the decorative scroll pattern on the bottom of the grip frame was introduced in 1961 and in 1964 dual cylinder nickel Frontier Scouts were introduced as was the change to the pinned barrel. Dual cylinder K Frontier Scouts were usually shipped in the same box as the dual cylinder F series revolvers. The only difference was a small white end label with red printing that indicated the nickel finish and both calibers. 1968 was the last year for the .22 Magnum as a separate caliber and the dual cylinder Buntlines were first produced in 1969. The highest serial number on record is 43987K.
The P series or "Frontier Scout '62" revolvers were introduced in 1962 and featured a new "Midnight Blue" finish combined with the heavy Zamak alloy receiver and grip frame of the K series. The series started with serial number 999P. The new finish on the grip frame and receiver was apparently a painted or dipped coating that was glossy black. Unfortunately, this finish was highly variable with regards to durability. Many revolvers have survived with mint finish but others, even some unfired specimens, have suffered significant damage from minor handling. Barrel lengths and chamberings were the same as in the F and K series revolvers. Guns were fitted with synthetic grips called "Staglite" which resembled real stag horn material with silver colored Colt medallions. The early grips had a nickel-plated screw and escutcheon (size was similar to the center fire Single Action Army grip parts), while the later ones used a smaller nickel plated or blued screw and escutcheon similar to the other Frontier Scouts. The Staglite grips themselves varied also. Some had a smooth finish and were nicely contoured to the grip frame. Others, usually later examples, were darker in color, "blockier" in shape and had a rougher finish.
As in the F and K series, the dual cylinder P series Frontier Scouts were introduced in 1964 as was the change to the pinned barrel. The ’62 Scouts never had plain bottom grip frames because they were introduced after the decorative scroll was added in 1961. The last year for the .22 Magnum as a separate caliber in this series was 1967 and the dual cylinder Buntlines were first produced in 1969. The last P models were shipped in 1971 with about 67,000 having been produced.
There were many variations in the boxes for the P series revolvers. The earliest P revolvers were shipped in a red, white and black "picture" box which had six round pictures of cowboys, Indian fighters, gunslingers and others on the lid with a revolver shaped cutout in the box bottom. The later guns were generally shipped in tan cardboard boxes with revolver shaped cutouts in the box bottom and some of these had additional cutouts for the extra magnum cylinder. Early single cylinder boxes had the price ($59.50) printed directly on the paper liner. The price marking was not present in dual cylinder boxes. Except for the labeling, these boxes were very similar to those used with the F series dual cylinder guns. Dual cylinder boxes had a small white label on the end which indicated the model (’62) and the calibers. With these boxes, the serial number was not written on the outside bottom as it was with previous guns. Instead, Colt protected the box with a plain cardboard sleeve and the serial number was written on the outside of the sleeve. Unfortunately, most sleeves were discarded by the original purchasers of the revolvers, so the boxes usually cannot be matched unequivocally with the guns inside.
P series Frontier Scouts and P Buntline Scouts were shipped in regular wood grain boxes like other Colts and some were shipped with wood presentation cases. The Buntline boxes did not have a special label for the P model. The label used was the same as for the F series guns with the notation about “ebony comp. stocks” crossed out with black marker and the full serial number including the letter suffix written on the outside bottom of the box. Like the K series guns, many consecutive serial numbered sets were produced in the P series and these were usually shipped with the wood cases. One very interesting consecutive set was called the "Matched Pair" and consisted of two .22 LR Frontier Scouts in a double gun box with special graphics. This set is quite rare today. The P series revolvers were produced from 1962 until 1971 with a total of about 68,000 guns.