Marksman model 70 breakbarrel air rifle: Part 5
Marksman model 70 breakbarrel rifle.
This report covers:
- Remove the barreled action from the stock
- Step two — remove the end cap and mainspring
- Mainspring compressor
- Didn’t do it
- What else?
- Remove the mainspring
- Remove the piston
Today we disassemble the Marksman model 70 rifle that we learned is a combination of BSF and Weihrauch parts. You are going to be surprised today!
BB thanks all of you for his holiday yesterday. He used it to great advantage — by doing nothing, and doing it very well!
Remove the barreled action from the stock
Step one is to get the barreled action out of the stock. That is the same as for every Weihrauch rifle — two forearm screws and two more in the triggerguard. Once the stock was away I could see that the trigger in this rifle is not the standard Rekord trigger. Do you remember that I wondered about that?
Here’s what you are seeing. There are no pins through the side of the spring tube, holding the trigger assembly in, because this trigger is a solid piece with the end cap! You will see that in a bit.
It may look like a Rekord from the outside, but this is no Rekord trigger. Look at how thick the metal is. If it is a Rekord, it’s a variation I have never seen before.
Step two — remove the end cap and mainspring
Yeah, right. Step two is a journey into the mind of an engineer who was trying to make certain parts work with certain other parts. Since the trigger is not pinned into the end cap, something else has to be done to take the rifle apart. As it turned out there were three things holding the rifle together.
One was a bolt that housed the threads for the front triggerguard screw. This is a common approach with airguns other than Weihrauchs.
This bolt has 9mm flats and a circlip. But there is more to it than what you see here.
From this point on I took detailed photos of every step. I didn’t want to forget anything when it came time to assemble the parts.
That circlip was hard to remove because of course I don’t own the right tool. And the homemade tool I do have that will remove it is really for a crisis and not for daily use. I did get it off, though and look what happened.
The circlip and the plate under it are off the bolt. And the safety is on.
With the plate slid forward the trigger can now move the sear down (arrow) and release the piston. The safety is off.
If that nut is coming out, it’s time for the mainspring compressor. I used a socket to push in on the end cap just a little as I removed the bolt.
Put some tension on the end cap and remove the bolt.
Didn’t have a 9 mm open end wrench. Tried a Crescent, but this bolt was really tight, so I started it with Vice Grips.
Didn’t do it
Well, when the bolt came out of the hole the inner hole popped off-center a few millimeters and stopped (not enough tension on the end cap), so something else was holding the end cap in. I flipped the compressor over and removed the sight rail from the top of the spring tube. But the rail was on very loose and came off with hand pressure. Something else was holding the end cap in! And you can see it in the picture below.
The sight rail wasn’t holding the end cap in, either. But see that rectangular block on the upper left of the tube?
Weihrauch used a belt-and-braces approach with this springer! I looked and sure enough there was one more thing. You know those four tabs that have to come out to remove the R9 end cap? Well, under the sight rail of the Marksman 70 they have one big one. I mentioned it in the last photo.
I cranked a smidgeon more tension on the end cap with the compressor and then screwed the single sight rail screw into the hole of the one block and pulled it out easily. The end cap was now free to come out of the spring tube! All I had to do was relax the compressor tension on the end cap.
And there is the block that holds the end cap against the mainspring.
As I released tension on the compressor, the cap came out and out and out! I went clear to the end of my compressor’s screw length before tension was off the cap. There is about two inches of preload on the mainspring, but there should have been a half-inch more. The end coils of the spring had collapsed over the years.
And notice in the photo below that the trigger assembly came right out with the end cap. They are welded together into one assembly!
The end cap with the trigger came out about two inches. Notice that the end coils of the mainspring are closer together than the ones that are closer to the center of the spring.
The left side of the trigger.
Right side of the trigger.
The safety is on.
The safety is off.
Remove the mainspring
At the back of the mainspring is a bushing that has the threaded hole for the first bolt I removed. It is now removed from the spring tube.
Out comes the threaded bushing.
Now the mainspring and rear spring guide can be pulled out of the spring tube.
Mainspring and rear spring guide. The spring looks straight, doesn’t it?
The mainspring is pulled off the spring guide. Wow! It’s really tight. Oh, there is the problem!
And there’s the problem. This end of the mainspring where the spring guide was has collapsed coils that have canted. That’s the source of vibration and power loss.
Remove the piston
One more step in the disassembly. Remove the piston. To do that the barrel has to come apart from the spring tube in the conventional way (i.e. pivot bolt out and separate the parts). Then the cocking link will pop out so the cocking shoe can be removed from the spring tube.
The cocking shoe is excellent. Sometimes they crack, but this one is solid. It’s the piston that has some surprises.
The piston is well-lubricated.
Note the notch on the back of the piston (the top when it’s in the gun). That’s to clear that block that locks the end cap in the spring tube.
Surprise number two is this piston has a liner! And it’s cut just to fit this piston.
The Marksman 70 piston is lined.
Well, the rifle is apart and I now need to figure out what to do. I was surprised by the many details I’ve shown you today in this report. This doesn’t look like they threw some parts from this gun and some from that gun together and made a new airgun. It looks more like a snapshot in time before what became the Weihrauch versions of the Beeman R10 and R9 were developed. Sort of like they built these and then said, “But what if we did it this way?”
I used to think that if I ever saw one of these I would be able to spot all the BSF parts, but honestly, I can’t. What an unusual spring gun this is!
No doubt you guys will have a lot to say about all this. Even the yoots, whom I am starting to think are as smart as us old silverbacks — they just look better, will have something to say.
This is gonna be a fun one.