T R Robb Tuning Kit
Posted 25 January 2013 - 04:33 pm
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!
- Phantom likes this
Posted 26 January 2013 - 08:35 am
Posted 26 January 2013 - 08:49 am
Posted 26 January 2013 - 10:43 am
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.
What is the stock like? They look a bit plain to me.
- andyfr1968 likes this
Posted 26 January 2013 - 11:22 am
The stock is the traditional Chinese lacquer/varnish high gloss on a plain finish.
Edited by secretagentmole, 26 January 2013 - 11:22 am.
Posted 26 January 2013 - 03:39 pm
Posted 26 January 2013 - 05:17 pm
Posted 26 January 2013 - 06:44 pm
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!
- Bendover likes this
Posted 26 January 2013 - 07:46 pm
I picked my xs79 up for £99 brand new.
Posted 26 January 2013 - 08:23 pm
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.
- Phantom likes this
Posted 26 January 2013 - 08:29 pm
Have you tried Archer air guns. He's in the states but this guy exports.
Trying to track a thumbhole stock down, some optimistic twonks are trying to charge over £240 for a secondhand thumbhole 78!
Posted 27 January 2013 - 08:54 am
Posted 27 January 2013 - 04:02 pm
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