B50 Power Screw Mod

B50 Power Screw Mod

Joined: October 17th, 2016, 7:38 pm

December 28th, 2016, 10:51 pm #1

Has anyone done the mod where you cut a slot in the power adjust screw. How well it it work?
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Joined: January 14th, 2011, 9:42 pm

December 28th, 2016, 11:19 pm #2

... with a grade 8 allen set screw. I turned the end flat on the lathe first.

With a spring change and the adjuster I tuned for a 1500PSI fill and get a bunch of shots at 12FPE.

Very tame, quiet and accurate at that power level.
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Joined: October 17th, 2016, 7:38 pm

December 28th, 2016, 11:57 pm #3

Has anyone done the mod where you cut a slot in the power adjust screw. How well it it work?
I shoot at 20ft lb level so I think I'll leave everything else as is.
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Joined: January 14th, 2011, 9:42 pm

December 29th, 2016, 12:34 am #4

... it was probably almost 2 years ago I did all the work on it.
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Joined: October 17th, 2016, 7:38 pm

December 29th, 2016, 12:38 am #5

I shoot at 20ft lb level so I think I'll leave everything else as is.
Ok. Thanks.
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Joined: November 17th, 2006, 3:51 am

December 29th, 2016, 3:24 am #6

Has anyone done the mod where you cut a slot in the power adjust screw. How well it it work?
I just took the safety off (careful not to lose the little spring loaded steel ball for the detent).

Disassembled enough to get the striker out.

Took out the issue stroke screw.

Slotted the back end with a Dremel cut-off wheel.

Put the now slotted screw back in (slot to the rear).

Mad a skinny screwdriver to fit through the threaded hole that holds the safety on.

Reassembled.

Did all my tuning with the safety off the rifle.

Once I got where I wanted to be, put the safety back on.



Liked the rifles so much, did it twice (.22/.177):

Last edited by gubb33ps on December 29th, 2016, 3:29 am, edited 1 time in total.
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Joined: January 14th, 2011, 9:42 pm

December 29th, 2016, 2:01 pm #7

Can't argue with results. I had mine apart for debur & polish so while fluffing & buffing I dropped in the allen head screw.

Your 51 with the rosewood grip & cap is dead sexy...
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Joined: December 15th, 2015, 4:22 pm

December 29th, 2016, 2:04 pm #8

Nice to se the stocks side by side. Good lookers and I'm sure good shooters you have there.

Enjoy!

~GOD BLESS~

john
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Joined: November 17th, 2006, 3:51 am

December 30th, 2016, 12:23 am #9

Can't argue with results. I had mine apart for debur & polish so while fluffing & buffing I dropped in the allen head screw.

Your 51 with the rosewood grip & cap is dead sexy...
..a member with a lot more stock remodeling skills that I have. It, and the stock finish, have held up very well over the years I've owned it. The .177 50 is newer (one of the last FD airguns had) and the stock is pretty much as-issued.

These are not lite-weights, and pretty much nothing short of some drastic major replacement parts are going to turn metal-and-wood rifles into lite-weights (and I have to say, the air tube is much thicker than most rifles produced today).

Because they are never going to be run-way-model-light, may was well bolt up a decent size/weight scope and let 'em be "fat".
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Joined: October 17th, 2016, 7:38 pm

December 30th, 2016, 2:36 pm #10

Has anyone done the mod where you cut a slot in the power adjust screw. How well it it work?
6mm, 1mm thread pitch, and 12mm long. Sold at Lowes.
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