Air Gun Home :: View topic - Hiding a QB78 inside a British Army SA80 Bullpup FINISHED!

Big Ern · Veteran Member

Al you really did it this time. That's one of the coolest airguns on the planet!

Slavia · Moderator

Really beautiful work, Al. But where are the bottle opener, barbed wire snipper, and especially - the tea maker?

O.K., just watch. Al's next post will have all those things, and they will be elegant.

broommaster2000 · Moderator

I don't know if I would shorten it, but it looks great!

Alstone · Moderator & Site Supporter

I’ve finally got it finished and took it out for a couple of hours shooting this morning, I had already zeroed it in at 20m for use with the red dot sight and was getting ½” groups from a bench rest, the out put is around 9fpe for now.

I find it a very stable platform and it shoots better than when it was a standard QB, I did always have trouble with this barrel and had already chopped three bits off it, trying to get it to shoot better but this last chop down to 16” seems to have sorted it out, the trigger feels no different to the normal one and is very smooth. All in all I’m very pleased with the outcome, there is just one thing I may change at a later date and that is the weight 4.034Kg which is very much the same as the original SA80, a lot of this is made up of the 16g steel side plates, I will probably change this to aluminium sometime.

Plus add a TeaPot etc. Mr. Green

The action fitted into the mainframe of the gun

The action is held in the frame bu three screws

All the bits are fitted into the stock and ready for the
face plate to be fitted.

The connection to the QB trigger is by a rod
which goes directly to the new trigger

Fitted with a large silencer to compensate
for the shorter barrel

Fitted with the standard muzzel flash

Loading Cap inside the forestock

The bolt unit

The othe side with cheek rest

Al
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Stevesteve · New Member

Very nice Al.

Looks very like an SA80... Hear those running boots? It's SO19 on their way Wink

Cheers,
Steve

Big Ern · Veteran Member

That is a real work of art AL! VERY VERY well done and thought out. Great pictures too. How in the world will you top this one???? Smile

ZipSnipe · Veteran Member

Great job Al, I am loving it. Is that a solid rod of aluminum for the trigger linkage?

And whats up with the airsoft guns? Man I have seen a few of them that are just fantastic design and built like tanks.

Alstone · Moderator & Site Supporter

Alstone · Moderator & Site Supporter

Alstone · Moderator & Site Supporter

Slavia · Moderator

The concept and execution are pretty cool, but what impresses me most are your engineering solutions. These are not just analogues of an existant part, made bigger or prettier. Things like the straight pull bolt, the trigger linkage, the end cap, and hiding the original trigger all required a new function and new design constraints. Your solutions are elegant, and as if that weren't enough - beautifully made. I think they lost a hell of an engineer when you retired.

Alstone · Moderator & Site Supporter

Thank you Slavia for those kind words very much appreciated, It’s something I have been doing all my life so I suppose that helps.

I remember starting work as an apprentice in an engineering factory 55 years ago, ( Pause for Violins ) and the first job I was given was shortening screws, and the other day I was doing the same thing for the side plates screws for this gun, and thinking to myself, here I am after all these years shortening screws again and I still hate doing it, but I’m better at it these days. Smile

PS: I forgot to post this photo of the complete trigger linkage.

Al

Big Ern · Veteran Member

Hey Al, I love the shot of the gun with that big brake on it. How did you get the X pattern on it and what is it?

Alstone · Moderator & Site Supporter

Big Ern · Veteran Member

Thanks Al! That's a great idea, I love the look of it on the brakes. You did an amazing job on that rifle once again as usual.