11 November 2019, 00:14
chas257Remington 740
A friend of mine purchased a model 740 in 30-06 caliber several years ago and while sighting it in , on the first shot, with factory ammo, split the forearm. Fast forward to this afternoon, he took this rifle out with a new forearm & on the second shot the darn thing split again. Any thoughts as to why?
11 November 2019, 01:06
Duane Wiebe (CG&R)Hmm...I'm pretty sure those had a steel liner??? If it split with the liner in place, Id be very surprised. He was able to purchase an original?
11 November 2019, 01:32
chas257Yes, replaced with an original and it does have the steel liner.
11 November 2019, 02:58
chas257I checked with the owner; split the entire length of the forearm
11 November 2019, 18:03
ArnietWas the area of the barrel and forearm, where the gas is exhausted, blocked by anything? I did it once, and only once, with my left hand.
11 November 2019, 19:17
dpcdAsk him how much torque he put on the forearm retaining screw. Binding there, over tightening, or uneven bearing on the barrel, will cause what happened.
11 November 2019, 20:55
BobsterYep.
"The earlier Model 740 rifles were quite sensitive to variations in the degree of tightness with which the fore-end screw was set up, and a spacing block had to be used.
In the later Model 740 rifles and in the new Model 742 this is accomplished by making the fore-end screw with 2 separate threaded portions, each thread having a different pitch. When the screw is tightened, the parts arc drawn together by the differential action of ¿he varying pitches, and the fore-end comes up tight with a small clearance remaining between its rear end and the front of the receiver."
Bev Fitchett's Guns Magazine » Firearms Assembly
quote:
Originally posted by dpcd:
Ask him how much torque he put on the forearm retaining screw. Binding there, over tightening, or uneven bearing on the barrel, will cause what happened.
11 November 2019, 21:10
dpcdOne more thing; this forearm bears against the receiver and is pretty thin; over tightening cracks them, so I remember that Williams used to make a little aluminum block to go under the screw, which would allow the wood to float and not bear against the receiver. The stuff I remember from the 60s is scary.
12 November 2019, 03:42
chas257Thanks everyone for the responses, Doug is going to take it over to Williams gun site co. And have them take care of it.