Since its introduction in 2011,

The M4-177 (M417) was quickly a popular and highly sought-after air rifle.

Crosman intended this gun to be a reproduction of the M4 assault rifle, based on its pumping actions, gun style and additional features.

The M4-177 is a tactical rifle that shooters want with the simplicity of an air rifle.

Gun Type

Crosman M4177 pneumatic air rifle is multi-pump.

A multi-stroke air gun is equipped with a piston as well as a pressure cylinder.

The compressed air between the piston & cylinder happens when you cock your gun.

The cylinder’s lock valve keeps the air securely in the cylinder until you release it by pressing the trigger.

Because the cylinder has been pressurized, the release of this gas propels bullet through barrel in fractions of a second.

This post contains more information about the 5 types and uses of air rifles that you should know before purchasing.

A multi-pump rifle has many benefits. It gives you greater control over how powerful your shot is.

Pumping more will increase your velocity and power.

Pumping less can result in lower power and feet per sec (FPS).

Thus, the M4177 can be used for indoor and outdoor shooting as well.

Multi-pump air guns are generally lightweight, compact, recoilless and recoilless. This model is no exception.

They are also self-contained, so you don't need to buy expensive CO2 cartridges

Or scuba tank that other pneumatic require.

A pump air gun has one problem: it takes a lot of effort and time to properly cock each shot.

This can lead to poor timing when hunting. The target may move on while you're still trying to cock it.

The gun's internal diameter is 0.177 inches (or 4.5 millimeters).

The name refers to the 0.177 pellets that are used. These pellets are well-known for their high velocity, good knockdown powers, and flat trajectory (higher precision).

The 0.177 pellet is also very cheap so it’s awesome for shooters who shoot a lot for practice or in hunting. 

(To learn more about how to choose the best air gun caliber for you game, check out this post.

The Crosman M4177 is an automatic air rifle that fires one shot, unlike other air rifles.

A single-shot airgun forces shooters to slow down in order to be better marksmen.

You have a better chance of improving your shooting skills and precision by taking just one shot.

Crosman's M4177 is unique because it feels exactly like an actual M4-Assault rifle.

The barrel is rifled. This means it has spiral grooves in the barrel that make the bullet spin on its long axis.

Spinning the bullet stabilizes it in its path, improves accuracy and increases the shooting range.

Crosman designed the gun to look like an M4, and also included non-functional features

It reflects features found on a real carbine like a flat suppressor or trigger pin, hammer pin and trigger pins, magazine release button, takedown pin and magazine release button.

You might consider applying high-visibility tape to the barrel, as it looks very similar to an M4.

It can be distinguished from real firearms. 

Stock

Crosman M4177 has a black synthetic forearm and an elongated, textured polymer forearm.

ABS plastic is used to make the synthetic stock for Crosman M4177.

This stands for Acrylonitrile Butadiene Styrene. The chemical formula is (C).₈H₈)_x(C₄H₆)_Y(C₃H₃N)_Z.

It is commonly used to make air rifles.

The black synthetic stock, which is lighter than wood, is more resistant to atmospheric change.

A wood stock can expand or contract depending on the temperature.

These small fluctuations could affect your shot precision, which can be critical when hunting small game.

For those who shoot in extreme heat, humidity, or snow, the M4-177 is ideal.

You can adjust the stock length to fit your arm length in five positions.

The sling has two loop slots that allow for easy transport.

You can also train with both your shooting arms, or switch to the opposite-arm shooter during practice.

For added convenience, a thin plastic pad can be placed at the bottom of the gun.

The rifle comes with a fake magazine. This can be removed easily or used to store BBs and pellet clips.

Ammo

The Crosman M4-177 uses both BBs and 0.177 pellets as its ammo so you can shoot whatever ammo you’ve got lying around.

(For more on the differences between .177 & .22 and which jobs they do best, see this post.)

It includes a five-shot clip and a BB reservoir that can hold up 350 BBs at a given time.

This allows you to practice target shooting for many hours without worrying that you will run out of ammo.

Loading and Cocking

Before cocking, be sure to first push the cross-bolt safety in the trigger guard to the “ON SAFE” mode.

You will then hold the stock with one hand, grasp the foregrip with the other, and extend it all the way to the end.

After that, you can swing it back to its original position.

This gun will require at least three pumps to prevent pellet jamming, but don’t pump more than 10 pumps since that can damage the gun.

It is easy to load pellets or BBs. This gives you a wide range of shooting options.

Keep in mind that you can't shoot both BBs AND pellets at once. 

To avoid overloading ammo in the wrong port, pellets and BBs should be loaded on one side.

Although loading BBs or pellets can seem difficult at first, once you get used it it becomes second nature.

You can load BBs by moving the loading port covers towards the rear of the gun.

It can hold up to 350 BBs.

Close the port covers, push the button to retain BBs forward, tilt your rifle down, shake it, and then gravity will feed BBs into the magazine.

Then, pull the retainer back to lock them in.

Now, you position the pellet clip so the BBs can be fed through one of the pellet’s chambers.

The barrel should be tilted down so that the magnetic bolt can pick up the BBs. To do this, pull the bolt back and push it forward.

Now you can shoot with BB ammunition. 

If you’d like to load pellets, first load pellets into the pellet clip with the pellet’s nose lying forward.

Next, pull the bolt back, put the pellet clip into the gun and make sure that the pellet’s chamber is aligned with the barrel.

You are now ready to fire with pellets by moving the bolt all the ways forward. 

Speed and accuracy

It is easy to see that velocity is the same for all pellets. Each pellet provides a medium-fast shooting speed. 

Crosman M4177 has a maximum velocity at 660 FPS when using steel BB, and 625 FPS when using a pellet.

It can be driven at 576 FPS with Crosman Copperhead, 5.23 grain Daisy zinc-plated, or steel BBs.

Crosman premier super-match pellets, 8.18 grain pellets and 7.9 grain Crosman Premier pellet.

Its velocity is 529 FPS (559 FPS) and 625 FPS (625 FPS respectively). 

Different shooters have conducted accuracy tests.

It is possible to shoot a metal drum up to 100 yards.

This gun can be used for as little as 40 yards.

Common shooting groups include:

• 0.25 inches at 25 Yards
• 5/8 inch at 12.5 Yards
• 1 inch at 15 meters
• 2 inches at 40 meters
• 0.25 inches at 250 feet
• Quarter size at 40 Yards
• 2 inches at 35 feet
• 4 inches at 100ft
• At 30 yards, 0.25 inches
• 1.4 inches at 20 meters.

Rick Eutsler of AirgunWeb extensively tested the M4177 in the video.

Sight

Crosman M4177 includes an open sight. This sight consists of a dual aperture rear and post sight.

If you’re not familiar with these types of sights, then you might be in for a treat!

These sight types allow for greater clarity and more adjustments based upon terrain.

You can also remove the rear sight and front sight, and replace them with a scope. 

Aperture sights (also known as peep sight) are similar to standard open sights but have a cut in middle of the rear view for target alignment.

With aperture sights, the “ghost ring” of the aperture blurs the surrounding areas,

Your eyes will only be drawn to two points (the target and the front sight) in traditional open sights, as opposed to three (the rear sight, the front sight and target).

This type of sight is much more accurate than traditional open sight and can improve accuracy.

The Crosman M4177's rear aperture sight is also a dual sight. This means it has two rings, each with different purposes.

The larger aperture allows you to pinpoint the target quicker with the ring.

The ring with a smaller hole allows you to aim more precisely.

To account for windage, the rear view can be adjusted from left to right.

You can adjust the elevation of the front sight by moving it up or down. 

(For more information on the different types of air gun sights and which one is best for you, please see this post.

Picatinny's accessory rail is similar to the weaver rail but has a series ridges that are placed at specific intervals along its rail.

Picatinny rail offers more mounting options, so it is possible to swap scopes or mount scope rings anywhere along the shaft. 

Four optic rails are included with this gun: two in the barrel, one at the upper receiver and one in handguard.

For accessories mounting, I recommend using the rail on top and the muzzle only.

You should not install accessories on the rails that are adjacent to the pumping. 

The video below will show you how to adjust and install the sight on this air rifle.

Noise

The gun is extremely quiet. The noise is not mentioned in any of the Amazon, Walmart, Pyramid Air, or Cabelas customer reviews.

The shooting range and the intended use

This air sport has a shooting range of less than 40 yards.

The maximum range of a shot can reach 100 yards.

This gun can be used indoors and outdoors.

It is recommended by the manufacturer for target shooting and plinking

Accessories

Only the front sight and rear sights are included as accessories on this gun.

You can purchase additional gear to enhance the features of the built-in equipment, such as a scope, red dot laser, flashlight and other accessories.

Maintenance

This air gun needs very little or no maintenance.

You only need to add a few drops Crosman 0241 Pellgunoil to the barrel. The pivot pin will be ready after 250 shots.

This gun will last a long time with simple maintenance.

Specification

• Caliber: 0.177
• Multi-pump pneumatic power plant
• Cocking effort is 3-10 pumps
• Maximum Velocity: 625 FPS with pellet, 660 FPS in steel BB.
• Ammo: Pellets and BBs
• Weight: 3.75 pounds
• Barrel Length: 17.25 inches
• Overall Length 33.75 inches
• Capacity: 1 shot
• Barrel: steel rifled
• Front sight: removable, adjustable for elevation
• Rear sight: removable, dual aperture, adjustable for windage
• Trigger safety: manual
• Picatinny Style Accessory Rail
• Buttpad: plastic
• Material: ABS plastic / metal

Warranty

Crosman currently offers a limited warranty of one year from the date that the purchase was made.

Customer Reviews

There are many positive reviews from customers online.

Many people love it and find it fun to shoot with.

They like its simplicity, ease-of-use open view, adequate velocity and sufficient power as well as the modern design.

Nothing is more serious than a serious problem.

Pros

• You will feel and look just like a real M4-AR
• Lightweight
• Good power and medium velocity
• Quiet
• Very precise
• Flexible and useful synthetic stock
• Pumping action gives you control over the gun's power
• Can shoot both BBs as well as pellets
• Picatinny optic railway
• Effective dual aperture sight

Cons

• Pumping action is a tedious and time-consuming skill that can take some effort.
• Not great for hunting 
• Doesn’t have a scope

Price

Crosman M4177 costs only $60 USD which is quite affordable for a gun this caliber.

Conclusion

Crosman M4177 pneumatic air gun is a multi-pump pneumatic gun with many great features.

Although you will need to get used the pump-action, this gun is still a great choice for fun shooting with friends, family, or children.