S400 / S410 trigger tuning guide

[Beer Hunter]

Guys,

After a few recent questions regarding the S4x0 trigger, I’ve put together the following guide on adjustment and sear polishing:
http://www.a2kda.com/trigger

Proceed at your own risk!

Kevin.

[Beano]

I've been unhappy with the trigger on my a410 for a while now, but lacked the confidence to fiddle! However now i can see that there's not much to get wrong!

thanks

james

[Catcher]

Excellent, thanks

[Chewie]

An excellent guide Kevin , very professionally done, so much so that you have inspired me to have a go

Thanks for your effort

[Ray J]

I've allway felt my s400 trigger could be better, so I bought a P/T

I'll polish the s400 now

Cheers Kevin

Ray

[Snapshot]

Very nicely done, Kevin. If I don't sell my S410 I'll have it apart.

Jonathan

[Sniper 296]

Yes I know this and old thread....


but can some tell me what size allen keys I need?

Cheers

Mart

[RochdaleLad]

Buy a load of them, and see which fit

(in otherwords, I don't know so suck it and see. I could find out for you tomorrow)

[Columba]

Kevin, whilst the trigger is in bits is the compressed air in the gun safe or does the cylinder have to be emptied completely first?

(just for peace of mind!)

Cheers, John.

[lucky trigger]

Great info m8.. Looks like i will have the trigger in bits this evening





aas410k .22 ags 4-16x56 swat

[Beer Hunter]

Kevin, whilst the trigger is in bits is the compressed air in the gun safe or does the cylinder have to be emptied completely first?

(just for peace of mind!)

Cheers, John.

Trigger disasembly on the S4x0 with the gun charged should not cause any problems, but it is always safer to empty it first

[Cory Crow]

Fair play its nice now! nice one ter! the only thing i did differnt, i used a eletric tooth brush to polish insted! ! mighty fine still!

Fanks!

[Gwylan]

Hi guys, I just bought a new S400, and it comes with Nick Jenkinson's 3 sear trigger as standard, it's real "breaking glass" quality. When I was following Ter's trigger-tune guide some time ago on my old S400, I noticed an empty hole for an extra pin in the chassis plate. (This was when Nick's trigger was a £70 add-on.) I ordered the new parts from AA, £26, and converted my older gun, It really makes a difference.
Gus.

[Beer Hunter]

Gus,

Do you have any pics of the internals?

[Gwylan]

Hi Ter... I have to confess I don't know how to attach pics yet!
On the second photo of your tuning guide, you can see the extra hole.
The new top sear has a different outline, the middle sear, (the old lower sear), looks the same. The new sears contact surfaces are polished, but I buffed them up a bit. I had to file off some bad pressing, and a bit of the trigger to clear the new third sear. (the new trigger with the safety doesn't need this). I was speaking to NJ at a shoot in South Devon on Sunday, and he said it was better to use all new sears. It really is a cracking trigger, 100% predictable, and I'm convinced it's made a difference to my shooting.
Part nos. from AA are,

S320-2 Top sear
S321-2 Bottom sear
S325-2 Middle sear
S326 Chassis pin (small)
S329 Chassis pin spacer (small).... (little O-ring!)

HTH Gus.