Shrouded Walnut 77K

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JamieUK

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Nov 14, 2017
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Suffolk, United Kingdom
Just thought id share a few pics of my 1987 77k that ive been picking away at through the year, in my little home shop.

Now shrouded (and re blacked by a very nice gent called Paul Chell), sitting in a home made english walnut stock (with Ebony cap), running a 176gr skirtless rotating piston, and putting out 11.4fpe with both JSB 7.3's and 8.4's.

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Ive added a little brass bling here and there....

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....and also included a removable foresight (from an old Remi 700) so it can still be enjoyed as Herman intended....it is a 77 afterall 😊

20221116_153408.jpg


20221116_153353.jpg


Thank for looking 👍
 
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JamieUK said:
Just thought id share a few pics of my 1987 77k that ive been picking away at through the year, in my little home shop.

Now shrouded (and re blacked by a very nice gent called Paul Chell), sitting in a home made english walnut stock (with Ebony cap), running a 176gr skirtless rotating piston, and putting out 11.4fpe with both JSB 7.3's and 8.4's.

View attachment 311711
View attachment 311712

Ive added a little brass bling here and there....

View attachment 311713

View attachment 311714

....and also included a removable foresight (from an old Remi 700) so it can still be enjoyed as Herman intended....it is a 77 afterall 😊

View attachment 311715

View attachment 311716

Thank for looking 👍
Click to expand...

Apsolute masterpiece of a rifle, thanks for sharing!!
 
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JamieUK said:
Just thought id share a few pics of my 1987 77k that ive been picking away at through the year, in my little home shop.

Now shrouded (and re blacked by a very nice gent called Paul Chell), sitting in a home made english walnut stock (with Ebony cap), running a 176gr skirtless rotating piston, and putting out 11.4fpe with both JSB 7.3's and 8.4's.

View attachment 311711
View attachment 311712

Ive added a little brass bling here and there....

View attachment 311713

View attachment 311714

....and also included a removable foresight (from an old Remi 700) so it can still be enjoyed as Herman intended....it is a 77 afterall 😊

View attachment 311715

View attachment 311716

Thank for looking 👍
Click to expand...
Send the stock to Craig Petty for some skipline checkering and that project is done😉
 
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Thank you for the replies and kind words gents 👍

For anyone who may be interested, here are the specs on the tune-

20221207_195843.jpg


I passed these details on to a guy called Dan on the UK AGF as he has an excellent springer efficient spread sheet. He crunched the numbers and my 77 came back at 43%.

4.5mm's are generally excepted to run between 28 and 32% im told, so it was good to know efficiency has improved along with its manners, and the tune was worthwhile.

I cut the stock blank (plus another for a ground up 21mm underlever project ive been picking away at too) from this big kiln dried lump-

Screenshot_20220927-215208_Gallery.jpg


English walnut will never quite have the figuring of some other walnuts, but it still has a certain charm of its own 👍
 
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Heathrow said:
Send the stock to Craig Petty for some skipline checkering and that project is done😉
Click to expand...

Craigs work is superb and id love to be in a position to send it to him, but unfortunately times are very hard in the UK right now and financially many of us are being squeezed for every penny we have 👎

This was very much a budget build from start to finish, with the only real luxury being the pro re black. I picked the standard rifle up for £85 in a very sorry state. The kiln dried lumber was £34, re black £100, and raw materials bumped the final total up to just under £250 (so around $300?).

With a young family funds and time are always tight, so these budget builds are really valuable to me....they take a long time, but help keep the hobby and ol' airgun mojo going and id be lost without them 👍
 
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@JamieUK The rifle is a stunner as is, like Chuck in Ohio said I’d never believed it to be a budget build. But therein lies the beauty of a quality DIY- esp when you can finesse the wood yourself. Respektos (from latin LOL) on this labor of love project! I really like the grooves on the fwd end of the stock.

Your rifle, your build, it’s done when you say it is. PERIOD. Enjoy that beauty.

BTW- I imagine the TP was opened just a wee bit from 2.8mm?
 
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Heathrow said:
@JamieUK The rifle is a stunner as is, like Chuck in Ohio said I’d never believed it to be a budget build. But therein lies the beauty of a quality DIY- esp when you can finesse the wood yourself. Respektos (from latin LOL) on this labor of love project! I really like the grooves on the fwd end of the stock.

Your rifle, your build, it’s done when you say it is. PERIOD. Enjoy that beauty.

BTW- I imagine the TP was opened just a wee bit from 2.8mm?
Click to expand...

The grooves were a late edition Heathrow..... As the shroud added just over 3" to the barrel (and I was keen to keep it looking like a carbine) I made the forks of the stock around an inch longer than the standard 77 stock.....the grooves were then added to break up/ slim down that extra length. I think it kinda works 🤷‍♂️🤪

And you are spot on with the TP diameter sir....during the tuning/ balancing stage the stock piston started at 150gr (it was actually a Diana 48/52 piston that I modified)....

20220904_132649.jpg


.....and went to 176g with the addition of the top hat, and the TP ended up at 3.2mm. I was expecting it to be around 3.5mm but it all fell in to place at those dims (whilst testing different weight pellets) so thats where it stayed.....
 
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JamieUK said:
The grooves were a late edition Heathrow..... As the shroud added just over 3" to the barrel (and I was keen to keep it looking like a carbine) I made the forks of the stock around an inch longer than the standard 77 stock.....the grooves were then added to break up/ slim down that extra length. I think it kinda works 🤷‍♂️🤪

And you are spot on with the TP diameter sir....during the tuning/ balancing stage the stock piston started at 150gr (it was actually a Diana 48/52 piston that I modified)....

View attachment 311876

.....and went to 176g with the addition of the top hat, and the TP ended up at 3.2mm. I was expecting it to be around 3.5mm but it all fell in to place at those dims (whilst testing different weight pellets) so thats where it stayed.....
Click to expand...
Is there a general formula you used to arrive at the correct TP, piston diameter, piston sweep, piston weight?
I'm seeing more and more skirtless, lighter piston conversion for the <12 FPE rigs.
I assume this was started by Tony Leach? and the lost volume crowd?
I have his set up in my TX...night and day difference in recoil and shot cycle.
 
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