Uzi vid + cocking knob coming loose

[jonathon]

Well today I ran the most rounds I've ever put through my Uzi in session.. 700 rounds of WWB between two shooters and 6 mags. The only malfunction I had was a dud round of WWB that wouldn't go off in my Uzi or my Glock 17(you can see it in the video infact).

The only issue I had was the cocking knob kept coming loose :silly

http://video.google.com/videoplay?docid=2665213393039551952&hl=en

http://video.google.com/videoplay?docid=2275877246459582122&hl=en

I really need to get the Vector VFG.. having a hard time not having something to grab up there.

[jonathon]

So no one has any comments on the cocking knob?

[EmEleven]

Hold with finger.

[sofltodd]

the cocking knob may come loose due to vibration if your top cover is not a snug fit. I had this issue on my mini uzi SMG for a while because there was a bit of front to back movement on the top cover. It stopped coming loose when the top cover slop was removed.

[RoverDave]

Keep your finger on the top cover... why didn't I think of that!

[firefighter]

A drop of loctite when you reinstall the screw would do the trick.
If you had enough material sticking through the plate that the screw goes into, you could peen the end of the screw.
"Removeable grade" loctite is what I'd try first so you don't mess the original threads up.

[nationwide]

A drop of loctite when you reinstall the screw would do the trick.
If you had enough material sticking through the plate that the screw goes into, you could peen the end of the screw.
"Removeable grade" loctite is what I'd try first so you don't mess the original threads up.

That would be the blue ;)

[armabill]

I haven't shot mine that much to see if that would happen.
I wouldn't peen it, loctite is the answer.

I like the simplicity of the AR15 and the UZI even more.

[EmEleven]

That would be the blue ;)


+1 blue is the way to go. Don't use to much. Just a drop. A trick we also use is some expoxy. Just reg plastic epoxy, not the stuff for metal! Epoxy can easily be removed with a little heat if need be. Apply it to the threads of course.

[7.62bthp]

Blue=242/243
Purple is best for small threads, and can be removed too.

Us Harley guys don't go ANYWHERE without tools and LocTite!!!:silly

[SorenFAL]

+1 blue loctite, fingernail polish will work just as well.

[Open Bolts]

FWIW: The IMI surplus topcover I have HAS the screw peened in place...

[RuhRoRorge]

Is it me? Or do I count 27 rounds in each mag on vid 2?

[watchin]

Excellent videos, Jonathon. At first I thought you were shooting some 'smokey' ammo but then I saw that it was your breath! Must have been a little cool in Washougal that day (or too early in the morning). Loctite is the easy answer to the cocking knob. If the blue stuff doesn't hold it you can use stronger stuff (red). Even the permanent stuff turns into goo when you heat it with a propane torch. If you shot 700 rounds it would probably have come loose again even if you had hand tightened it with a screwdriver.
-watchin-

[jonathon]

Watchin,

Down in Washougal it was about 50-55, but up in the mountains(at about 3000-3200 feet) it was about 40, little chilly!

I sent the vids to Vector as well.. the top cover loosened up quite a bit and now rattles. Thinking that as someone here suggested that the top cover is bouncing around under recoil.

Out of curiousity, will an SMG top cover work?

[watchin]

I have an SMG cover on a semi-auto but it has a feature built in which does not allow the bolt to be pulled far enough back to release it when used with the semi. I took the ratcheting pawl out of the mechanism and now it functions just as the orginal does. Why do you think your topcover is rattling around so much? I would attempt to straighten that problem out with a big vise or a smooth faced hammer on a smooth surface. Both my topcovers fit very snug. There is a thread someplace that shows the use of a JB Weld fillet to hold the topcover in place but some people report that it breaks lose. Rebuttal to that is that if you prep the metal carefully it won't break loose.
-watchin-

[Quarterbore]

Honestly, I do think that is the first videos of a semi shooting I ever watched and I am debating if I made a mistake buying the semi? I planed to Form 1 it and then use it in 45ACP and I have the 9mm and 45ACP parts (less the short semi barrels).

Thanks for sharing the video, perhaps I will just write out the tax payment and be done with it and go shoot the UZI as I had planned!

[jonathon]

I'm honestly not sure why the top cover rattles but now there is a lot of play in it(side to side, front to back, but not up and down) versus when new it was just front to back.

The semi is loads of fun, trigger sucks but bouncing cans at 25-30 yards is fun and it works great on steel!

[sofltodd]

jonathon does your cocking knob have both feet on it (little stubs on the bottom?)

[jonathon]

jonathon does your cocking knob have both feet on it (little stubs on the bottom?)

Yes it does(now that I've taken it all apart).

Also found what appears to be a lock washer.. doesn't seem to be working well.

[jonathon]

I got an IMI SMG Top Cover on the way.. if that don't tighten it up a bit I'll be calling Vector. The cover came in a stock kit I wanted anyways, so might as well wait till then :)

[sofltodd]

I had an issue with my mini SMG top cover having a little front to back movement causing enough vibration to loosen up the cocking knob. I was blue loctiting it but that was only a temp fix. As a result of the knob coming loose I ended up getting the feet from the cocking knob pushed off somehow. The final fix was to get the top cover adjusted perfectly to the gun so there was no play.