All values are approximate and intended for comparison between models only as individual rifles will vary. Some Finnish M24s and M91s have heavier barrels. Stock density and lengths vary slightly and laminated stocks tend to be shorter than hardwood stocks. The length of pull (trigger to butt) for all models is 13 1/2" (34.3 cm.). Rifling is 4 groove, right hand, 1 in 9 1/2" (24.1 cm.) twist for all models except the M28/30 which is a 1 in 10" (25.4 cm.) twist. For more information on external barrel dimensions see the Mosin Nagant Rifle Barrel Contours page.

⁽¹⁾ Barrel lengths include the threaded portion inside the receiver
⁽²⁾ Groove diameters vary and Russian/Soviet rifles tend to run larger than the nominal size of .311" to as much as .314". Slugging the bore is the only way to be sure of the exact measurement. See the illustration below for an explanation of the relationship between bore diameter and groove diameter.
⁽³⁾ Lengths are approximate.  See the Cleaning Rod page of the Mosin Nagant Features section for more information.
⁽⁴⁾ Includes Dragoon and Cossack models and Eastern European M91/30s
⁽⁵⁾ Includes Eastern European M44s, and Chinese T53s

Screw and Thread Sizes

Measurements are taken from actual parts, are not based on original specifications, and apply to all models unless otherwise noted. Thread diameter and screw lengths are averages of several examples and vary among individual parts. The thread pattern on screws and other secondary parts appears to be the English 55 degree Whitworth pattern. However, the receiver and barrel are a 60 degree pattern according to Myron Petro of Aces & Eights Custom Guns and Clark Magnuson. Their assistance in measuring these is greatly appreciated. Russia bought the original tooling from England and the M91 was built to an inch pattern as the metric system wasn't adopted until after the Revolution. All subsequent Mosins maintained the same patterns and therefore screws from the earliest M91s will fit the last M44s and vice versa. All thumbnails and full size pictures are to the same scale with each other. The simplicity of the Mosin Nagant design is illustrated by the fact that there are only 5 different thread sizes out of 11 threaded parts on a typical Russian/Soviet model.