Mike. try a touch of hing pin grease alaround the lug. especilly the underside of the front catch part. I hav this issue too and mine is an ill-fitting forend tht presses gainst the bbl andthe latch isslightly askew or off center. I must fix that, but I shoot other guns.
Is this a new problem??? Is the barrel and or forend iron the original??? Is the wood original???
Yes.. I would try a little grease first... Sometimes.. new forend wood is to thick.. and it does not allow the sliding lock to easily engage.. The fix for that is to remove a tiny bit of wood.. (save this for last option)..
Are there any burrs on the forend lug?? A quick deburring can often solve this problem.. A fine stone is all you need for that.. NOT a file...
If that makes it better.. but not perfect..a little 600 grit lapping compound will seat it all in quickly...Be sure to remove all traces of it when you are finished..
PBB. No the problem is not new. I bought it at an estate auction. Had it rebuilt and the wood re-checkered and refinished. The problem as it is exactly. The button was very difficult to push down.(The grease made it easier to operate). Now the button needs some force but snaps down and works OK. Not real smooth. After the button goes down the wood does not want to pull off the gun. It really needs a good tug. The previous owner must have had the opposite problem because there is bedding material on the inside of the wood shaped to the contour of the forearm. He probably put it in to tighten it down but now it is a little too tight. I use it as a second gun so it does not get a lot of use. My thinking is if I used it more it eventually would loosen up. Does this sound reasonable. Thanks, Bulge.
I would take the wood off the iron.. and check it for fit.. If it works correctly.. there is a little to much wood..causing the locking piece to bind... If it catches without the wood.. you'll need to stone down where its tight..Since it does lock.. the adjustments will be TINY..Do a very little bit at a time.. or bring it to the GRAND.. and we'll get it perfect for you.. All Good.. Mike
Mike, between the wood and the barrel (forearm installed) there is a slight gap of around 3/32. On the bedding material there are some slight high spots. Do you think taking a very little off on the high spots this will help? Mike.
Try squeezing the center of the forend to the barrel a bit before pushing the latch button. If the button is much freer...good. This will ensure the forend wood remains tight to the bbl and doesn't wobble. If the squeeze needs to be excessive, a little bit of the bedding in the bbl channel will need to be scraped out.
As for the forend assy being difficult to pull off AFTER the button has been pushed, first try a dab of grease on the back of the forend lug. If it helps a little, then try polishing the back of the lug with very fine abrasive cloth to polish up the surface. You do want a small amount of resistance, this keeps the forend iron tight to the receiver. And, if this was a current rebuild, shooting 500-1000 rds will loosing it up some also....just like a new gun.