18 January 2015, 17:48
larrys01Model 70 Win Problem
I have a post 64 M70 Lightweight in 22-250. Push Feed. With a dummy round in the chamber after you fire it, as you lift the Bolt about 1/2 way it catch's and requires a lot of force to left it any more. I suspect the receiver lugs are galled? No problem with a empty chamber? Also when you fire it with the dummy round in it the firing pin seems sluggish. I suspect at one time this had a very heavy load fired in it? Has anyone run into something like this? It is apparent a amateur worked on this as it appears the stock may be a replacement from the original?

18 January 2015, 19:26
Toomany ToolsFirst, dissassembly the bolt, clean and lube it. Check the cocking surfaces closely for damage.
18 January 2015, 21:34
AtkinsonThat would normally be an indication of an overload, and that can come about for several reasons such as a tight chamber or neck to start with..An oversize or out of round chamber can also cause this problem, but a chamber cast will reveal all of these possibles.
I would shoot some milder loads in it first of all. and if that isn't the problem I would then take a chamber cast to determine if the problem is with the gun itself.
The trigger should be a separate issue altogether and suspect its gooped up, needs cleaning and perhaps it needs to be re-set or even tuned.
18 January 2015, 21:51
Snellstromquote:
Originally posted by Toomany Tools:
First, dissassembly the bolt, clean and lube it. Check the cocking surfaces closely for damage.
and try the dummy round without the cocking piece on it.
I had a .243 Win M70 Lightweight Carbine that developed a problem with the little plunger thing on the left side of the bolt shroud and it acted about as you are describing. The name of that part escapes me.
Actually I just looked at that rifle again and it was not the plunger I spoke of it was actually a screw head on the left side of the bolt shroud that gave me the same symptoms you are experiencing. Check that screw and see that it's not backed out a little. I tightened mine and then filed a little off the top too.
19 January 2015, 18:13
larrys01Thanks Guys
I cleaned out the chamber and bolt and the problem seems to fixed.
