Neil works his magic on a mod­ern clas­sic PCP

Air Gunner - - Contents -

In part two - Neil con­cludes his trig­ger restora­tion on a clas­sic Air Arms S510 ri­fle.

19 This is the con­tact sur­face where the mid­dle sear con­tacts the ham­mer sear.


That sur­face should slide a bit smoother now.


When putting the sears back on to their pivot pins I put just a smear of gun oil on the pins.


When re­mov­ing the ham­mer sear, it fouls on the aper­ture in the ac­tion and can­not be re­moved as it is.


With a suit­ably-sized pin punch and a small ham­mer, the ham­mer sear pivot pin can be knocked part way through the trig­ger hous­ing.


Only knock it through far enough to al­low the top ham­mer sear to be re­moved.


The con­tact sur­face on the ham­mer sear be­fore be­ing pol­ished. 26 How the con­tact sur­face looks after pol­ish­ing.


The top ham­mer sear po­si­tioned back over the part of the lu­bri­cated pivot pin that is still pro­trud­ing through the trig­ger hous­ing. The top sear re­turn spring is held down out of the way of the top sear with a small screw­driver un­til the sear is fully seated, and then the spring is re­leased into its cor­rect po­si­tion.


The ham­mer sear pivot pin can then be knocked back flush with the back of the trig­ger hous­ing.


With the tip of a small screw­driver, I now put a smear of Moly grease on all of the con­tact and bear­ing points.


The owner of the ri­fle had picked up a re­place­ment brass trig­ger from Rowan En­gi­neer­ing and asked me to fit it:

Rowan En­gi­neer­ing Ltd. Unit 9, Over­field Thorpe Way, Ban­bury Oxon OX16 4XR

Tele­phone 01295 251188 E-mail: [email protected] rowa­nengi­neer­ or [email protected] rowa­nengi­neer­


The re­place­ment Rowan trig­ger just slips over the orig­i­nal pivot pin. The mid­dle sear ten­sion spring and grub-screw can now be re­placed. I put just enough pres­sure on this spring so that the trig­ger when cocked has just a slight pres­sure on the first stage.


With the 1.5 mm A.F. hexagon drive key sup­plied with the trig­ger, I ad­justed the front screw to give around 3mm first travel on the trig­ger.

The rear screw sets the let-off point of the trig­ger.


The later S400 and S500 mod­els have a spring that lo­cates be­tween the trig­ger hous­ing and a pro­trud­ing lug on the trig­ger. This is to give a pos­i­tive ‘feel’

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