by Tony.T » Sun Mar 24, 2013 3:40 pm
Parts for western arms GBB pistols are no longer available. The only guy selling them was Mike Cripps of Elite shooting centre, but he no longer does them as I believe WA are no more, sadly.
However- you may not need to replace anything. Leaking mags are common across all makes. Strip it all down, including the valves, remove the seals and clean them with Silicone oil. Then reassemble using a thin coat of silicone grease on the seals.
Provided the seals were not split or physically damaged in any way you should be ok until it needs doing again!
If that doesn't work I think I have a spare WA mag that I can sell you- it may not be the right one for your pistol, but it was for a short barrelled infinity so the internals should be the same.