Altros regulator for AA s400

[Kippaxblue]

Thank you for your swift replies. I have looked at both the lane and huma regs but both require drilling, which means there is no way of removing them at a later date without buying new parts.

[Archer50]

Before I put an Altaros regulator in my .177 S400 Classic I got around 70 shots with a spread of 20 fps from 170 bar to 100 bar. After I fitted the regulator I got 67 shots with a spread of 12 fps from 200 to 100 bar. The Altaros regulator worked perfectly and was easy to install and adjust, but in my opinion the results of a 'drop-in' installation in an S400 don't justify the expense. The slightly improved velocity spread is so small you can only detect it over a chrono - it has absolutely no detectable effect on real world grouping or anything else, and the reduced shot count is a bit of a pita, especially as it means I need to get my air bottle filled more often.

All regulators do is make the air pressure per shot more constant, but without additional tuning and modification, you will get very inefficient use of air, which is why my shot count went down. If you really want to benefit from installing a reg in any of the Air Arms S400/500 series, you need to think in terms of a pretty drastic set of modifications including drilling out the transfer port, replacing the valve and hammer springs and lightening or replacing the hammer, plus a LOT of work balancing and tuning. After all that, depending on which model, you may get 80 to 100 shots in a 6 fps spread. You'll also probably have spent over £100 and got yourself something else to go wrong.

For me it was an interesting experiment, but I'd never do it again. In fact the regulator will be coming out as soon as I get round to it.

Alan

[zephyr]

At first I had an Altaros. I liked it, although I was still the weak link in the shooting partnership. Then fitted a Lane. Liked it even more, I would spend the money (and considerable time getting the balance right) again.

But then again, you could consider a good MK4is, it's sent my S400 and HW100 into retirement.