ejection port latch/cover

[M4rk]

the detent thats suppose to lock the dust cover isnt locking anymore. >:( wer can i get a replacement??

[Microgunner]

They're not intended to stay closed. Something about the dust cover causing the action to malfunction due to the low pressures of the .22lr cartridge. That's why they ground the little notch in the receiver where the dust cover lock latches. A replacement dust cover may not help you. My Colt/Umarex dust cover won't remain closed either. The dust cover is there basically for show, like the forward assist button.

[M4rk]

mine closed. till it got worn. plus, the cover opens when u charge the rifle.

[Microgunner]

Mine would remain closed for a short time when I first purchased mine as well but quickly stopped.

This is normal.

The dust cover is supposed to pop open when the bolt cycles on any AR-15.

[wobblinwheel]

See if Anna Dalton at Umarex will send you a NEW-STYLE cover assembly. The newest rifles have a WORKING dust cover. She will probably tell you it "won't work", and the notch in the receiver opening will prohibit it's function. I know for a fact the notch does NOT cause the cover not to latch, it's the design of the catch itself. My brother's .223 AR has the same "notch" that simply allows the ball-catch on the cover to snap over edge of the opening. Try to talk her into sending you one. Maybe you'll have better luck than I did.

[M4rk]

haha.. arite, ill see

[rodent.22]

I put a DPMS cover on mine- still does'nt latch. It did when new. :grin:

[techmike]

Mine latches fine, always has.  ;D

[Mr Sunshine]

I put a washer on the bar and it has worked perfect ever since.  Stays shut until the bolt is cycled everytime... 3000+ rounds through it and still holding.

Uploaded with ImageShack.us

Uploaded with ImageShack.us

Uploaded with ImageShack.us

[M4rk]

niiice

[wobblinwheel]

I notice my rifle does not have anywhere NEAR the size of notch in the receiver opening! Mine only has a slight "rounded-off" area where the cover catch hits. It seems really evident that the cover was originally designed to work. The way they made it NOT work was to physically "shear off" the spring-loaded cover latch. Since the little plunger was made of plastic, I simply drilled a really TINY hole there and threaded-in a teeny round-headed screw to serve as a catch. Wasn't easy at all, but it works well. Possibly better than the plastic one would have. I,ve seen copies of the FIRST manuals for the M4, and they refer to an "operating dust cover". Then, about a year later, the manual refers to a "non-functional dust cover". Now, on the new online Colt/HK catalog, the M4 is stated to have an "operating ejection port cover". As I've said earlier, Ms. Dalton at Umarex actually refused to send me a new "operating" dust cover assembly, saying the notch in the receiver (which I don't have) would not let it work! I even stated I would assume the risk & cost if it didn't work. Still no luck! These corporate people seem "brainwashed" sometimes!

[asmurff]

Will the after market covers for AR-15/M16/M4s fit? Or would that not solve the problem?

[rodent.22]

Nah Smurff, I have a DPMS cover and it is an exact switch, but it doesn't latch either....

[NCspecV81]

I used two different dpms covers on mine and they both work. A normal phosphate finish and a hard chrome one.

[Elessar]

My brand new M4 Ops works for now, but it's easy to see that it will wear and become non-latching.  The latch doesn't have the spring built into the cover, so it looks like it'd wear down and fail to latch in short order.