Replacing The Mainspring


Long time reader. 1st thing I do every morning is read the updates. Upon your recommendation I changed the recoil spring in the stock. It was 3/4″ shorter than the new one. How do you think it will effect the action or the recoil. Is 3/4″ a lot?

I also had the trigger rebuilt by Timney. It was the original with no work done to it. What a difference when the all the creep is taken out.


Dear Mark,

The loss of 3/4″ of mainspring length indicates that the spring is wearing and doing its job. This amount of loss isn’t excessive at all, but it does indicate that it is time to change. I just usually swap the springs out after a certain number of rounds. For me I use 10,000 as the spring change indicator. I’ve had the old spring come out 1-1/2″ shorter than the new one going in.

A new mainspring is the cheapest and best maintenance you can give your gas gun. The mainspring is the only thing that keeps the gun from beating itself to death. As I have said before, if I had known about changing mainsprings earlier on, my 1100s would have lasted a lot longer than their average 35,000 round life. Live and learn.

Aren’t Allen Timney’s auto trigger jobs the best? Bless that man. For our other readers, you can reach him at Allen Timney, 13524 Edgefield Street, Cerritos, CA 90703, tel: 562-865-0181. He charges around $70 for the best trigger job you will ever get on a gas gun. I have a Beretta 303 with close to 60K through it. I also have a spare which is unfired but has a few modifications. Both have Timney trigger jobs. The one with 60K is almost as good as the new one. Remarkable. I have to get the triggers on most of my O/Us recut every 20K or so.

Best regards,

Bruce Buck
The Technoid writing for Shotgun Report, LLC
(Often in error, never in doubt.)

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