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As far as I remember, the A303 lacked the valve spring which was fitted to these, otherwise they are quite similar. I doubt they are any more reliable from my experience of using them which didn't show any evidence of it. The chap I bought it from uses 3" inch chambered autos very successfully for competitive use; I understand the theory about them, but the practical difference seems very low.
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Is the valve spring behind the piston, 'helping' to return it to the cylinder after firing? If so, this seems a logical addition. I just wondered. Regards ... Geek
PauL H. -
Shotgoon
Brownings: 1999 Ultra XS; 2004 B525 Field; 2010 Maxus Hunter: Air Arms 1998 Mk.2 Pro-Target, 2001 Mk.2 Pro-Sport & 2003 S400C
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No, they go just in front of the gas block.
I think the current AL391 has the for-end cap spring loaded instead.
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The main and perhaps only difference between the 390 and 303 is the inclusion of a 'excess' gas vent valve which is, as you say, in front of the cylinder - that's pretty much it. Regards ... Geek
PauL H. -
Shotgoon
Brownings: 1999 Ultra XS; 2004 B525 Field; 2010 Maxus Hunter: Air Arms 1998 Mk.2 Pro-Target, 2001 Mk.2 Pro-Sport & 2003 S400C
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A 390
Hi i have a AL390 Lioness ltd edition, one problem is the rod thats connected to the sliding block breaks every now and then, which is a bit of a pain when your out in the field, but its easy to change just push the pin out replace it with new one, five minutes job done, thanks for looking.
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