The Finnish army undertook a project to reline worn out M91 barrels in 1925. These are known as the "P-Series" with markings of P-26 and P-27 on the barrel shank with the numbers indicating the year. P-25 markings have been reported but not confirmed. All the original Russian markings are removed from the barrel shank. Some of these barrels are also marked with an “S” which is believed to indicate “Salerno”, the town in Italy where the relining process was developed. It is thought that many of these relined barrels were not installed on receivers until the desperate times of the Winter (1939-40) and Continuation wars (1941-44). Many of the P-Series barrles are “in the white” while the receiver and other parts are blued, which supports this theory. A very few rare P-Series Dragoons are known. The basic configuration is identical to the M91, with the same variations in minor features typically found on Finnish rifles.

Barrel Markings
		The unmarked barrel to the left is thought to be similar to a P-Series without any of the typical "P-2X" or "S" marks. It is SA marked, of Finnish origin, appears to be relined, and considered uncommon. picture courtesy of Arlon

Features

Sights
P-Series rifles have the same type sights as the Russian Konovalov design of 1908. The primary difference is the Finns remarked the rear sight bases in meters utilizing the existing notches. Occasionally an extra notch is cut at the rear of the base and is marked 2 (200 meters). Typically the numbers are placed on the right side of the base which was left blank by the Russians, but there are lots of variations in the manner of the numbering and how the existing Russian numbers were treated.

P-Series front sight bases are integral to the barrel and identical to the Russian version. However, the variation in blades is tremendous. Many of them are pictured below with brief descriptions.
Russian barleycorn
Curved base, flat top
Curved base, flat top, notched rear
Curved base, curved top
Curved base, curved top, notched rear
No base, flat top
No base, flat top, notched rear
No base, curved top, notched rear
No base, untapered blade Uncommon
Semi-curved base with wider dovetail, flat top Uncommon

Cleaning rod nut, tapered hole in front only, hole in top threaded to receive nose cap screw to aid in removing nut

Nose cap

Sling Slots	Front	Rear
Russian with screwed in place escutcheons
Russian w/ Finnish hangers
Escutcheon plate with round hole and hangers

Early Russian M91 barrel band	Late Russian M91 barrel band
Barrel band retaining pin (early, rare)	Barrel band retaining screw (late)

Handguard
Handguard end rivets
Copper
Small aluminum
Large aluminum

Bayonet socket