Type: Non-blowback CO2 BB Pistol.
Manufacturer: Distributed by Crosman.
Model: MK45.
Materials: Mostly plastic.
Weight: .63 pounds (281 grams).
Total Length: 7.25 inches (184mm).
Barrel: 4.5 inches (114mm) metal non-rifled.
Propulsion: CO2 x 1.
Action: Semi auto non-blowback, DOA trigger.
Ammunition Type: .4.5mm steel BB’s.
Ammunition Capacity: 20 round drop out metal stick magazine.
FPS: Claimed 480.
Trigger Pull: The Crosman MK45 CO2 NBB BB Pistol has a typical double action tiger with a longer trigger pull that requires more length and effort to pull, but I would say is still usable as an action shooter. The Crosman MK45 trigger pull makes the internal metal barrel move forward and out of the front of the barrel opening a bit, then when you reach the release point it snaps back into the BB Pistol acting like the hammer and releasing CO2.
Accuracy: I have yet to shoot the Crosman MK45 CO2 NBB BB Pistol or performed my standard Field Test Shooting Video, so I can not comment at this time on the actual performance other than what is claimed in terms of fps. I have shot several similar CO2 BB Pistols which share almost the exact same internal components but have a different external skin on them. The good news is the metal stick magazines for all of these type NBB CO2 BB Pistols are the same so they will be interchangeable. My previous experiences with similar BB Pistols is that they will get mid 400fps velocities and in general will shot around a 2 inch grouping or so. It is hard to say how close the Crosman MK45 CO2 NBB BB Pistol is going to shoot to the bullseye, as out of the box it may shoot a bit high or low or left or right. We will find out during my shooting test.
Build Quality: The Crosman MK45 CO2 NBB BB Pistol is a pretty much an all plastic Airgun with only a few metal parts I can find on it. The trigger is metal along with the inner barrel and the area where the CO2 goes in. Because of the plastic build, it is rather light weight which can actually be good in a fall as the mass is low resulting in less damage if you were to drop it on a hard surface. Scratches will also be less noticeable on a plastic Airgun over a metal Airgun as the material on a plastic Airgun is all tan/black rather than a painted surface that will show blemishes a lot more. The simplicity of the design means you should get a lot of use from the Crosman MK45 CO2 NBB BB Pistol before encountering any issues.
Realism: The Crosman MK45 CO2 NBB BB Pistol is not a replica of an exact real steel gun in production but it does share a lot of cosmetic characteristics as what you would see on a Sig Sauer or even H&K Pistol. The magazine release on the Crosman MK45 looks and works a lot like what you will find on an H&K Pistol. There are few external mechanical working parts on the Crosman MK45 CO2 NBB BB Pistol other than the trigger, safety and inner barrel. The barrel is slightly recessed and the CO2 tab is hidden in the grip which helps in terms of believability.
Pros:
Desert tan with black grips looks really good in my opinion.
High FPS rating of 480.
Picatinny rail on frame for adding on accessories.
Non-blowback should get lots of shots per CO2.
Easy to see fiber optic sights front and back.
CO2 tab is nicely hidden inside the grip.
Double action trigger pull is long but not too firm.
Uses a generic all metal stick magazines commonly found on lower cost BB pistols.
Ambidextrous magazine release.
Simple design with not a lot of moving parts will make it reliable for a long time.
Cons:
All moulded plastic BB gun for the most part.
Not many working parts, it’s pretty much an all plastic BB gun.
Grips are fairly loose, they don't really snap into place.
Sights are not adjustable.
Comments:
I personally prefer blowback Airguns that have a more solid weight and feel to them with more working parts, but again there is a lot more that can go wrong and parts tend to complex parts wear out over usage a lot quicker than a more simple design like in the case of the Crosman MK45 CO2 NBB BB Pistol. Price is also going to be a lot less when looking a more simplified Air Pistol like the Crosman MK45, as the plastic build is a lot cheaper to produce. Another bonus with non-blowback CO2 airguns is that they do tend to have a much higher velocity and also generally you will also get more shots per CO2 than a similar CO2 Blowback Pistol. It really depends what features you want more and in this case you also get a more cost effective Air Pistol with plenty of shooting enjoyment. A couple other strong points to mention about the Crosman MK45 CO2 NBB BB Pistol would be the fiber optic sights front and back and its sharp l looking two tone layout.