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MODEL 1999: MONTANA LONG ACTIONS

The first action produced by the Montana Rifle Company was the standard Long Action.The long action will handle any cartridge from the 270 Winchester up to the 375 H & H and 458 Lott length cartridges. It comes standard with one of 3 different magazine boxes. One for standard cartridges that has an internal magazine length of 3.400", one for longer magnum cartridges that has an internal magazine length of 3.650" and one specifically designed for the ultra cartridges that also has a internal magazine length of 3.650". The action will have either a standard bolt face of .473" or a magnum bolt face of .534" depending upon the cartridge of the rifle you are building. It's also available in either 415 Stainless Steel or 4140 Chrome Moly.
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LONG ACTION SPECIFICATIONS

Part Description Dimensions/Weight/Hardness
Receiver Material & Hardness 4140 or 415, Rc 42-45
Receiver Ring Outer Diameter 1.340" (34mm)
Receiver Thread 1.0 - 16 UNF - 2B
Thread Depth to Mauser Collar .750" (19.0mm)
Recoil Lug Thickness .377" (9.6mm)
Recoil Lug Width 1.165" (29.6mm)
Recoil Lug Depth .400" (10.2mm)
Guard Screw Spacing 7.575" (1923mm)
Receiver Base Width 1.165" (29.6mm)
Internal Magazine Length 3.650" (92.6mm)
Bolt Material & Hardness 4140 or 415, Rc 44-48
Bolt Diameter .698" (17.7mm)
Scope Base Spacing - Front .860" (21.9mm)
Scope Base Spacing - Rear .860" (21.9mm)
Scope Base Spaceing - Front to Rear 4.335" (110mm) (see note below)
Note: The spacing of 4.335″ is from the rear hole on the front ring to the center hole on the rear bridge. The spacing from the rear hole on the front ring to the rear hole on the rear bridge is 4.907″

Action Nomenclature:

1st Letter - Action Size:

B= Short Action
C= Long Action
D= Professional Hunter

2nd Letter - Steel Type:

C= Chrome Moly
S= Stainless Steel

3rd Letter - Config:

R= Right Hand
L= Left Hand

4th Letter - Bolt Face:

S= Standard Cartridges (.473” Rim Diameter)
M= Magnum Cartridges (.534” Rim Diameter)

5th Letter - Mag Box Configuration

(On Long Action Magnum Receivers there is a 5th Letter which represents Mag Box Configuration:)
S= Standard Magnum 3.450”
L= Long Magnum 3.65”
U= Ultra Magnum 3.65 with cut outs for the fatter Ultra Mag Cases