The Crosman-M4-177-Pneumatic: Good For a Little While At Least

The Crosman M4 .177 air rifle is a pretty good gun with some pretty good features. The problem is that it really isn’t something that is going to last you for very long. Reports keep coming in about this particular model and, while they are far from universal, they are certainly enough to give me pause and don’t sound that particularly implausible. In an attempt to do the best review possible, we’ll go over the details.

Crosman M4 .177 Air Rifle

Crosman M4 .177 Air Rifle


Let’s start with something really positive. The way that this weapon handles ammunition is fantastic. Essentially, it uses a 5 pellet mag strip that is fed into the rifle, which uses the bolt action to slide the new pellet into place. It’s a useful and satisfying system that I quite enjoy the thought of.

There is also a place in the stock where you can store 350 BBs and load them into the chamber by tipping the gun down, flipping a switch, shaking the gun a little to load a BB into the bolt, then closing the switch. It’s a little strange, but not terrible and almost makes the hole in the stock worth it.

Speaking of the stock, another benefit is that the stock is adjustable, meaning that it will fit a child or small person as well as it would a large adult.


Here is where this rifle starts to go off the rails. It was clear that Crosman was trying to thread the needle between price and quality by making this gun mostly out of plastic. It’s heavy, strong plastic, but it’s still plastic and it doesn’t seem to be able to handle the rigors of its own recommendations.

When you first get this rifle, it will feel incredibly solid, but more and more people are reporting that after a few months and sometimes a few weeks, the stock will break or the air chamber will spring a leak. It seems that if you limit yourself to roughly five pumps per shot, you can extend the life of this gun for a little while, but you end up sacrificing power, which shouldn’t be an issue when the manufacturer recommends 10 pumps. The gun just seems to blow itself out after a short time.


Something else that can be said about the Crosman M4 .177 is that when you first get it, it is remarkably accurate. In some cases, it’s pretty easy to get a grouping in 1 1/4 inches from 20 yards. It shows a lot of power in the first stages of use, especially if you’re using the maximum 10 pumps. However, this comes with caveats.

First, if you’re using the BBs or pellets that are not Crosman brand pellets, you’re unlikely to get very good accuracy out of it. The Crosman Destroyers fire fine, but everything else is pretty wobbly. It’s also very hard to find a scope that actually fits this particular weapon, and I can’t help but wonder what Crosman was thinking in making something this non-standard in that regard.

The sights that come with it are pretty miserable as well, and they seem to wiggle a bit too much to be useful. So while you can get an accurate shot from this particular weapon, it’s a struggle just to have the chance to do so. Not something that is going to make anybody particularly happy.


One thing I did like was that Crosman at least made use of the design choice by finding utility in what would otherwise be just decoration. For example, since it’s modeled on the AR15, it has a “magazine” in front. The temptation could be to use this as a handle with no other purpose, but instead they decided to make it a removable case where a small screwdriver (included) for adjustments and some extra pellet strips could be stored. Not a bad thought and one I appreciate.


  • Well used design
  • Good early accuracy with right ammo
  • Great ammo and loading options
  • Looks cool


  • Tendency to break quickly
  • Accuracy fails after a while
  • Hard to find scope or working sights

I understand what Crosman was trying to do with this rifle, but it just didn’t come off the way that they were hoping. In trying to make a less expensive gun, Crosman appears to have made just a cheap one. The best review I can give would be to say that you’re much better off getting a?Crosman 760 Pumpmaster, which is basically this only less flashy and better made.


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  1. After owning this rifle for about nine months and using it lightly just for target practice the pump all of a sudden one day was so hard to operate that I had to brace it against my leg in order to pump it but the rifle still works any ideas do I need to break the thing down and clean it or what

  2. I purchased a floor model last holiday season. This one is completely different than the others I find now. Heavier by at least 2 oz. There has been no issues even remotely that of what was described. I was interested in purchasing a second for my youngest, only have not found a “like” model. I tend to feel this product was somehow manipulated in midstream production to a lower quality and price.

    The grouping at 8-10 pumps over 20 yards is within 1.25″. That’s by my 12 year old sight adjustment. I can keep slightly tighter.

    One other key design difference here was the available sights… none fit as were described by the manufacturer. Even though on every storefront the model and descriptions were a supposed match. Food for thought.

  3. I just bought a m4-177 and I was going to put a drop of two of Pellgun oil on the pump cup like I do with the 1322’s and 1377’s I own and shoot all the time.
    I have noticed the barrel’s muzzle is off center when I look down at it.
    The first 40 shots were done while trying to set the iron sights and it seems to be faulty or something because I can’t get this rifle to sight in!

    • I recently ordered full metal ar15/m16 iron sights to replace the terrible stock sights that came with the m4-177, and the difference is amazing!
      I recommend all m4-177 owners buy UTG ar-15/m16 iron sights for their air rifle.
      Not only do they give you elevation and horizontal with the rear sights but you can replace the front sight post with a variety of sizes.

  4. I bought this model about 6 months ago, I sighted it with 5 pumps at 45 yrds. I haven’t added any extras and I’m getting a solid 2 inch grouping. I’d recommend it to anyone that asked, that being said it’s the only bb gun that I’ve bought in the last 15 years

  5. I own a crosman m4 .177 and I brought a scope for it but it doesn’t fit. Any idea what scopes fit what’s the measurements for a scope thanks

    • I had mine for about 2 years now. I have fitted a NC Star SC430BT and it works very good.

    • Shayne MacDonald December 29, 2016 at 8:02 pm

      Your problem is with the mount, the mount has to be preferable picatinny but weaver is also compatible. You may have to remove the rear sight as well (depending on scope clearance).

    • I have the same problem. I picked up a cheaper scope but the rail mounts wont open up far enough to fit on the rails. I went to the Crossman web site and any scope for picatinny rail should work. Im lost too!

  6. […] Most pellet guns that are used in hunting are either .177 or .22 caliber, so we’re going to focus on those. There is a rule of thumb among air rifle hunters, “.177 for feathers, .22 for fur,” meaning that if you’re hunting birds primarily, you should be using a .177, and a .22 is better for squirrels and rabbits. There are exceptions, like the Winchester 1000 Wood Break Barrel, which is a .177 but certainly powerful enough for rabbits and even small coyotes.? But the fur/feather mantra is still a decent guide. […]

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