Crosman Mark I

Ruger Mark I (.22 semi-auto)

Crosman, Model Mark I
Replica Of:
Ruger Mark I (.22 semi-auto)
Made In:  
22, lead pellet, single-shot
Air Source:
CO2, 12 g Powerlet
partial tin of old style Crosman .22 pellets

Recommended Pellet or BB:
H&N Match Kugeln
Weight (lb)/Length (in):
2.6, 11.0
Body Material/Finish/Grips:
metal, black, plastic
Barrel Length (in)/Material/Rifled:
7.75, steel, yes
Trigger Action:
Trigger Pull (lbs)/Adjustable:
4.8 (SA), yes
Sights (front/rear):
fixed, fully adjustable
Velocity (fps):
400 (hi), 300 (lo)
Sound Level (dB): 100 (hi setting), 96 (low setting)
Thickness of Pellet Holder (in): N/A
Manufactured Dates:
1966 - 1983
85%, yes, yes (no lid)
Serial Number:
Comments: This gun is the first variant in the Mark I series and has the power adjustment screw and the lever piercing system. This version of the Mark I was produced from 1966 to around 1975. The second variant, which lacked the power adjustment screw and had a push button piercing system, was produced until 1983. The Crosman Mark I is from the Golden Decade of Crosman CO2 pistol production. Concurrently produced with the Mark I were the 600, 451, Mark II, 38C, 38T, and the SA-6. All of these guns are still popular with shooters and collectors alike. This particular airgun was resealed in 2006.

Mark I and II article by Todd Cooper
PyramydAir Report on Crosman Mark I and II - Part 1.
PyramydAir Report on Crosman Mark I and II - Part 2.
PyramydAir Report on Crosman Mark I and II - Part 3.
Owner's Manual for Crosman Mark I (.pdf)
Exploded View of Crosman Mark I (.pdf)

Performance: Measurements were made on 11/06/06 at a temperature of 70 F and 14' elevation. A ten shot string was fired from a bench rest at 15' using H&N Match Kugeln pellets (13.4 gr). The highest velocity measured on the hi-power setting was 426 fps, the lowest was 415 fps (average of the 10-shot string was 423 fps). On the low-power setting the MV averaged 311 fps. A six shot string fired with open sights grouped at 0.41". Click the thumbnail below to see a larger image. Click here for a description of the measurement methods.


Right Profile:

Front View: Power can be adjusted over a limited range by turning the screw located under the barrel at the front of the receiver. Turning the screw clock-wise increases power, counter-clockwise decreases power. The power adjustment screw will adjust power for both settings of the cocking knob.

The Mark I has an adjustment for the trigger as illustrated below.


Right Side Markings:

Left Side Markings: Pulling the cocking knob all the way forward puts the gun in the hi-power setting. Pulling the cocking knob half-way forward puts the gun in the low-power setting. The safety can only be engaged when the gun is cocked. Once the gun is cocked, there is no safe way to decock it.

Loading Pellets:

Loading CO2: The CO2 cylinder is inserted neck down and then the piercing cap is screwed on with the lever in the "home" position. To pierce the cylinder, the lever is flipped to the opposite side. Once the cylinder is pierced, the lever must be flipped back to the "home" position.

Packaging: There is no lid for this box.

Owner's Manual for Crosman Mark I (.pdf)
Exploded View of Crosman Mark I (.pdf)



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