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Here's a list of the different series of the Mini 14 by year.
180 Series Link
Produced from 1974-1977.
Brass ejects upwards.
Shipped from factory with wood handguard installed.
Original Mini-14, no longer supported by Ruger (i.e., no 180-specific parts available)
181 - 186 Series Link
Produced from 1978-1999.
"Standard" Mini-14
No factory scope mounts, single blade front sight, low round rear peep sight.
Brass ejects upwards.
Still supported by Ruger factory parts.
196 - 197 Series Link
Produced from 2000-2004.
Same as 181-186 Series.
187 - 188 Series Link
Produced from 1982-1995.
Mini-14 Ranch Rifle
Factory Scope Mounts, flip-up rear sight, single blade front sight.
Brass ejects to side to avoid contact with scope.
Still supported by Ruger factory parts.
195 - 197 Series Link
Produced from 1996-2004.
Mini-14 Ranch Rifle.
Same as 187-188 Series.
580 - 581 Series Link
Produced from 2005-Present.
Mini-14 Ranch Rifle.
Winged Rear Peep Sight, Winged (3-blade) Front Sight.
Integrated Scope Mounts.
At some point in the 580 Series, Ruger introduced the "heavier," flanged/tapered barrel which improved accuracy and decreased heat sensitivity (stringing).
_Twist Rates for Mini 14.
Mini14 rate of twist
1. 1974- 1986 is 1 in 10
2. 1986- 1997 is 1 in 7
3. 1997- present is 1 in 9
180 Series Link
Produced from 1974-1977.
Brass ejects upwards.
Shipped from factory with wood handguard installed.
Original Mini-14, no longer supported by Ruger (i.e., no 180-specific parts available)
181 - 186 Series Link
Produced from 1978-1999.
"Standard" Mini-14
No factory scope mounts, single blade front sight, low round rear peep sight.
Brass ejects upwards.
Still supported by Ruger factory parts.
196 - 197 Series Link
Produced from 2000-2004.
Same as 181-186 Series.
187 - 188 Series Link
Produced from 1982-1995.
Mini-14 Ranch Rifle
Factory Scope Mounts, flip-up rear sight, single blade front sight.
Brass ejects to side to avoid contact with scope.
Still supported by Ruger factory parts.
195 - 197 Series Link
Produced from 1996-2004.
Mini-14 Ranch Rifle.
Same as 187-188 Series.
580 - 581 Series Link
Produced from 2005-Present.
Mini-14 Ranch Rifle.
Winged Rear Peep Sight, Winged (3-blade) Front Sight.
Integrated Scope Mounts.
At some point in the 580 Series, Ruger introduced the "heavier," flanged/tapered barrel which improved accuracy and decreased heat sensitivity (stringing).
_Twist Rates for Mini 14.
Mini14 rate of twist
1. 1974- 1986 is 1 in 10
2. 1986- 1997 is 1 in 7
3. 1997- present is 1 in 9