CA94 and clone plastic cocking lever support

[flashlightining]

The clones and Cohaire use a plastic charging tube or cocking tube assembly. When mine broke, I have seen just get a HK metal one. Well the one I got does not fit. Would it be that I need to have the HK one turned down slightly, ever so slightly. The plastic one was a bit sloppy anyway. Maybe compare the diameters and take half the difference between the two for the machining.
This has been a difficult venture for me in the hk clone world. Maybe I should give up and buy a "planet of the Apes" Hi point arms carbine.....
My neighbor bought one of those and I could have 7 or so for the cost of having this CA-94....
any help would be greatly appreciated.
thanks

[Chopstix Kid]

CA also made their own cocking tubes so it's very possible that it is out-of-spec although I know may people to have replaced the plastic ones with steels ones with no fit issue.

Personally, I would look into haviing the cocking tube re-reamed to proper I.D.

[flashlightining]

CA also made their own cocking tubes so it's very possible that it is out-of-spec although I know may people to have replaced the plastic ones with steels ones with no fit issue.

Personally, I would look into haviing the cocking tube re-reamed to proper I.D.

Actually, that thought crossed my mind too, so I would be able to change it out with another support. But, once you replace the plastic ones with the steel ones you never have anymore problems. It would be easier to take a little metal off the O. D. of the metal support rather than the I.D. of the tube.
Wait., maybe ream it out with a wire brush on the end of a drill with a bit extension?
I still am not sure which way would be the best to turn.
Thanks chopstix....

[flashlightining]

It would not take much metal off. I can get the support in the tube, but It as to be taped in and out slightly with a robber mallet. It would not hand cycle.
Maybe this is some better information.

[Chopstix Kid]

Look really close inside the cocking tube and make sure the welds did not burn through---which they typically do, but during manufacturing, the tube is indeed reamed to clean-out everything. If you look really close into a factory German gun you can see the reaming marks. It's very possible that your was never reamed.

When I say reamed, you would typically use a steel reamer on a lathe, Bridgeport and yes, a hand drill will work. But anything that you can run into the cocking tube that will gently remove material should work.

Which to do? cocking tube or support? Personally, I would do the cocking tube... but that's easy for me to say as I have the right tools to do it. How would you remove material from the support? Do you have access to a lathe or were you going to hand file it?

Also, where it is hanging up? the entire length of the tube or just at the end where it is supposed to lock in the forward postion?

[scottinthegrove]

Did you buy a standard MP5 cocking tube support or a .40/F model support? It is my understanding that the F cocking tube support is larger in diameter than a standard MP5 cocking tube support. Instead of having the detent and spring at the muzzle end with a fixed cocking handle the F support has a spring tensioned "L" shaped cocking handle.

Or maybe a little bit of weld were the cocking tube is welded to the receiver that has burned through. I'd take the end cap off and look through the cocking tube for any obstruction. The cocking tube support in my converted 94 is fairly snug. I have a CA89-40 and the plastic support is pretty sloppy. I need to get around to replacing it.

Scott

[flashlightining]

Look really close inside the cocking tube and make sure the welds did not burn through---which they typically do, but during manufacturing, the tube is indeed reamed to clean-out everything. If you look really close into a factory German gun you can see the reaming marks. It's very possible that your was never reamed.

When I say reamed, you would typically use a steel reamer on a lathe, Bridgeport and yes, a hand drill will work. But anything that you can run into the cocking tube that will gently remove material should work.

Which to do? cocking tube or support? Personally, I would do the cocking tube... but that's easy for me to say as I have the right tools to do it. How would you remove material from the support? Do you have access to a lathe or were you going to hand file it?

Also, where it is hanging up? the entire length of the tube or just at the end where it is supposed to lock in the forward postion?

It starts to hang up half way past the ejection port. Also, I would never use a hand file but thanks for asking.
I was thinking of locking it in a drill press and using a mild abrasion material on it. It does not need much taken off.
I am leaning towards your idea. I need to know what size of a reamer to use, i would have to look into that option.
I looked down the tube with a flashlight and did not see anything that looked funny. Also the plastic support had no groves cut into it, like for a weld through or other obstruction. It was clean except broke from stress.
thanks again...

[Chopstix Kid]

Yeah, that's right about where the two spot welds are... probably got some shrinkage from the welding. Frm my experience thus far, it's pretty common even if the weld are clean. Also, just to double-check what Scott said... you do have the correct support, right?

I don't know the reamer size off the top of my head but I have one all setup at the shop specifically for after-welding cleanup. Next time I'm in there (maybe tomorrow or Monday), I'll get the size and let you know.

Not that you'd probably want it... but I have a brand new CA plastic support... you are more than welcome to have it.

[flashlightining]

Yeah, that's right about where the two spot welds are... probably got some shrinkage from the welding. Frm my experience thus far, it's pretty common even if the weld are clean. Also, just to double-check what Scott said... you do have the correct support, right?

I don't know the reamer size off the top of my head but I have one all setup at the shop specifically for after-welding cleanup. Next time I'm in there (maybe tomorrow or Monday), I'll get the size and let you know.

Not that you'd probably want it... but I have a brand new CA plastic support... you are more than welcome to have it.

Well the parts came from kenw45, I believe they are correct for a MP-5 or HK94, which are suppose to be the same. These came from a FA 9mm gun.
I have fired 400-500 rounds through this gun. Therefore I don't think it is the welds, the plastic support did not have any groves cut into it.
PM sent

[DJF]

flash,
ream/clean the cocking tube. that way you are in spec. and anything you add &/or chaange in the future will work. you won't have to go through it again.
Dj