when putting the dust cover back on, make sure that you first slide it underneath the trunion, then radially bring it down posterior and HIT IT to make it fit.

Perhaps it just SEEMS that its short, but it's supposed to be that way.

OR
take a picture

 

The front to rear trunnion spacing may be a bit out of spec.., too distant. But a fix that can work is to take a pair of channel locks or vice grips and gently bend the very lower rear edge of the receiver cover to the rear. Go gently and bow it out a little all along the rear vertical edge. Go slow and not crazy. This will often give the little extra forward movement to loc into the rear sight base detent and stay locked.

 

i have spot welded a little strip of sheet right behind the cover to add space and tighten up. just like a galil has...

 

You can also bend a little bow into the rear of the top cover which will casue it to push forward an engage the front lip a little better.

 

I must agree with the thought that the receiver cover is too short. I took it out again last weekend and shot it more. The cover didn't pop up this time, but it seems that if the cover was about 3/16" longer, it would fit snug against the rear of the receiver. I plan to carry it back to the dealer and see what they say, before I do any bending or mods.

If you can tell, there is a pretty good space behind the cover, enough that you can see the screw that goes into the stock. Even when you cycle the bolt back, it starts to come loose.

 

Your rear trunion is set too far back. Your best bet would be to do as Turbothis recommended...perhaps he could do it for you if you don't have the right tooling. :twisted:

 

I got a new replacement cover from I.O. today, and guess what? It's exactly the same size as the original. I believe the rear trunion is set too far, as Surly and Turbothis both stated. I emailed I.O. and I'll see what they say. The dealer where I bought it said he would swap the gun out, but he doesn't have any more in stock, so it could be months before he gets any, if he gets any more at all.

I imagine I would have to break the gun down in order to weld a strip onto the rear trunion.

 

Don't weld the strip onto the rear trunion, weld it onto the back bottom part of the top cover.

Or try bending it out. I had to do that with a couple of guns and it's a good fix that works.

 

Now that I have a spare cover, I may try bending it gradually to see if I can make up the gap. It's short a good 1/4", so the cover may bow out in the middle and not bend evenly. The other alternative is to find a good gunsmith and have him weld a strip on the cover. Most of the welders I know are oil field welders, and not really qualified to do precision work like that.

 

Now that I have a spare cover, I may try bending it gradually to see if I can make up the gap. It's short a good 1/4", so the cover may bow out in the middle and not bend evenly. The other alternative is to find a good gunsmith and have him weld a strip on the cover. Most of the welders I know are pil field welders, and not really qualified to do precision work like that.

Save yourself the frustration and have the piece welded to the extra cover. A little bend won't hurt, but to cover that gap it won't bend out that far. You'll get to a point where the metal starts tearing at the corners. Ask me how I know. :twisted:

 

I'll go out on a limb, Surly, and say that you have tried this one already! No sense tearing up a perfectly good extra cover. I'll find a good gunsmith and have him add on some metal, I can always file it down and fine tune it afterwards. I shot it today, and the cover did not pop loose, but it still should be more secure.

 

If you cannot weld, try putting some solder on the rear of the dust cover. Even some PC7 steel epoxy might work.

 

This sound slike a job for JB Weld. I work with a welder and I am gonna take it to him and see if he feels confident enough to weld onto it without blowing through it. The tech rep from the manufacturer even suggested bending the cover out, to take up an 1/8" of difference. However I have far more than that. Just the way the gun was built. It still shoots like a charm though.

 

OOW receiver? They were known for that, assuming the builder didn't account for it..