What I got for my birthday - a brand new Walther CPM-1

[tkinva]

This is the one I bought:

https://www.gunbroker.com/item/772817317

I was looking around the web last fall and I saw a picture of a guy holding a CPM-1. Straight out of a science fiction movie. This is the gun that ignited my interest in air pistols.

So I started shooting, and I started collecting and eventually decided that I like 10 meter CO2 pistols. I have Tau 7s and a recently-acquired Feinwerkbau C25, but it was still the CPM-1 that I really lusted after. Most of the ones for sale seemed pretty beat up and well used. Then I saw this one and snapped it up.

It appears to be brand new. I had some trouble removing the tank. but I used one of those wrenches with a rubber strap, like they use for opening jars. You have to be careful because there's no trigger guard.

I charged up one of the tanks. Would it fire? I had no doubt. These old CO2 pistols are like a 1968 Volkswagen. Simple, rugged, reliable.

It shoots beautifully. Even a beginner like me can appreciate it.

When I look at my FWB C25, I think of Star Wars (they used modified C55s in a later episode). When I look at my new CPM-1, I think of Star Trek.

[ChipEck]

Just curious; how many shots do you get out of a fill?

[tkinva]

Just curious; how many shots do you get out of a fill?

The manual claims 180 shots from a 40gm fill. From what I've seen so far, I would estimate between 200 and 300 shots on a full fill.

The CPM-1 doesn't have a velocity adjustment and I've measured the pellets I shoot at about 555 FPS. Fast enough to leave a nice clean hole in the target.

I've just started shooting with a full cylinder. I'll post my findings. Stay tuned.

[Leon]

Very, very nice.

The Walther CPM-1 has to be one of the best air pistols that I have owned.

[northpaw]

I had some trouble removing the tank.

That`s an issue whenever the pressure in the tank gets low for this gun model.
I own a CPM-1 (reddish colour-version). Very nice indeed.
I get some 120 shots pr. cylinderfill.
BTW I own a FWB 25, and a FWB 20 and a FWB Co2-2 and... but I consider the CPM-1 the nicest of those.
The Walther COM-1 were offered in two coluurs, silver grey and red.
One nice feature is that space-age looking air deflector at the muzzle.

[tkinva]

That`s an issue whenever the pressure in the tank gets low for this gun model.
I own a CPM-1 (reddish colour-version). Very nice indeed.
I get some 120 shots pr. cylinderfill.
BTW I own a FWB 25, and a FWB 20 and a FWB Co2-2 and... but I consider the CPM-1 the nicest of those.
The Walther COM-1 were offered in two coluurs, silver grey and red.
One nice feature is that space-age looking air deflector at the muzzle.

After having the tank seize up twice, I found a way to keep the tank from locking up.

When you screw the tank on, you meet resistance as the valve opens and the gun gets pressurized. Keep turning and you eventually reach a hard stop. The secret is to back off about 20 degrees from this point, so the tank is not jammed against the gun. After doing this, I haven't had any problems.

Like you, I also got just over 120 shots, which seems kind of disappointing for a bulk fill gun.

My C25 has a larger tank, and seems to shoot forever.

I've never seen a red CPM-1. Can you post a picture?

[tkinva]

Update:

I just finished another CPM-1 tank, and this one yielded just over 160 shots.

You can tell when the tank is near empty as the holes in the target start getting ragged.

Still working on jamming a little more CO2 into the pistol's tank. I'm up to about 39gm.

It's early days yet.

[ChipEck]

Update:

I just finished another CPM-1 tank, and this one yielded just over 160 shots.

You can tell when the tank is near empty as the holes in the target start getting ragged.

Still working on jamming a little more CO2 into the pistol's tank. I'm up to about 39gm.

It's early days yet.

Have you tried putting the pistol's CO2 cylinder in the freezer for about 30 minutes before filling? That might let you load more CO2. Also, if your CO2 tank is low that could also result in pistol's CO2 cylinder not being completely filled. It is possible to over-fill.

[tkinva]

Have you tried putting the pistol's CO2 cylinder in the freezer for about 30 minutes before filling? That might let you load more CO2. Also, if your CO2 tank is low that could also result in pistol's CO2 cylinder not being completely filled. It is possible to over-fill.

The manual says:

"... the maximum permissible amount of gas in a filled cylinder is 37 g of CO2."

But then it says:

"40 g CO2 for approximately 180 shots."

So the 39 gm I mentioned above is probably about as far as you'd want to push things. I'm still breaking in the gun, so it may be a while before I have the final results as to FPS and shots per fill.

As far as freezing the tank before filling, I'm not sure it's necessary. I've only recently started playing with bulk CO2, but I was able to fill the CPM-1 tanks without freezing.