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T R Robb Tuning Kit


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#1 secretagentmole

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Posted 25 January 2013 - 04:33 pm

Or how to get a lot more whizz bang for your buck!

I recently picked up a project I have wanted for a while a QB78. These are lightweight little rifles which have a half decent mechanism in them. With a little bit of piggery jokery a respectable pcp can be had for not a lot. Indeed the QB cost £140 with a wobbly Exocet (having a word with Andy about that) that was built in Turkey (a Hatsan by another name that Mary has bagged for pigeon hunting). SO lets say the rifle cost £70 second hand. Bit of surface rust that was taken care of with Legia and tinfoil!

OK, so now to the strip down, knock safety catch out, undo central stock fixment, gun off stock! Yes that darned easy! Ensure CO2 chamber is empty, undo two screws, trigger off, remove foresight, barrel band, a screw or two more and kerpow, 2 tubes, a bit more of a wiggle and a grub screw and the barrel is off the probe housing, one more grub screw and the handle comes out the bolt and the bolt is out the back of the housing.

The Robb kit (£61) has a new hammer block, new probe, seals, DVD, valve and piercer too! Easy enough to fit, but take care, some of these guns are more responsive to tuning than others. Mine was very sensitive, so I put the old hammer block in and power is a respectable 11.4-11.5 at room temp using a 14.3 grain pellet! We also invested in a Robb trigger tuning kit and the trigger is now nice and silky smooth! This was a bucket of laughs from start to finish, got a cracking little back up stalking rifle and a bit more experience in the triggery pokery of gun tuning!
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#2 porkybella

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Posted 26 January 2013 - 08:35 am

Ive had a few of these rifle the th78d was my nicest. Would have one back any day.

#3 secretagentmole

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Posted 26 January 2013 - 08:49 am

They respond well to a tune too. It is the ideal starting point for someone to venture into the world of gun tuning. The trigger mod alone transforms the gun. Then when you get into replacing seals, fill probe, hammer etc, the gun improves in giant leaps, whilst still remaining relatively affordable!

#4 Acuspell

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Posted 26 January 2013 - 10:43 am

So lets get this right...you buy a gun, then disassemble it and fill it full of "good bits" to make it work right.

That is like buying a Harley Davidson...after buying the bike, you then spend a fortune on aftermarket parts to make it run and stop like it should have out of the factory. :laugh:

What is the stock like? They look a bit plain to me.
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#5 secretagentmole

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Posted 26 January 2013 - 11:22 am

People spend a lot more money tuning rifles that cost an awful lot more (HW spring powereds for a start)!

The stock is the traditional Chinese lacquer/varnish high gloss on a plain finish.

Edited by secretagentmole, 26 January 2013 - 11:22 am.


#6 porkybella

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Posted 26 January 2013 - 03:39 pm

The thumbhole is a decent stock. Standard ones are rubbish

#7 secretagentmole

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Posted 26 January 2013 - 05:17 pm

Trying to track a thumbhole stock down, some optimistic twonks are trying to charge over £240 for a secondhand thumbhole 78!

#8 milegajo

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Posted 26 January 2013 - 06:44 pm

They fit in ags pcr1 stocks with some slight modification i read.

Great project, lots to learn and tinker with. No experience of the TRR Rob kit. My XS79 responded most favourably to a welsh willy seal kit. I polished the trigger, hammer, bolt etc and with the hpa tank I had a superbly accurate pcp!


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#9 porkybella

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Posted 26 January 2013 - 07:08 pm

They only £160 brand new in rfd near me

#10 milegajo

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Posted 26 January 2013 - 07:46 pm

They're finally importing the target stock version too I believe.

I picked my xs79 up for 99 brand new.

#11 georgenottingham

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Posted 26 January 2013 - 08:23 pm

Loving that new stock http://sheffieldairr...ht-p-72216.html
I did all the above including welsh willy seals. I have a minimum 50% improvement! Great fun to use and that's what this sport is all about, having fun not flashing the cash. :)
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#12 reaper1064

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Posted 26 January 2013 - 08:29 pm

Trying to track a thumbhole stock down, some optimistic twonks are trying to charge over £240 for a secondhand thumbhole 78!

Have you tried Archer air guns. He's in the states but this guy exports.

#13 secretagentmole

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Posted 26 January 2013 - 11:48 pm

Trying SMK first!

#14 porkybella

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Posted 27 January 2013 - 08:54 am

Look on solware.com gunshop in tamworth. Xs78 with target stock 150 brand new. Scope bag pellets incl

#15 tomburras

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Posted 27 January 2013 - 04:02 pm

This sounds an interesting project, what sort of accuracy can theese achive?


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