I am considering purchasing an older RWS 24. I believe there are 2 sizes of compression tube variations. Is the larger tube better/better replacement parts availablility/springs/etc.? Also, can someone enlighten me what the difference in triggers are? (T01/T02/T05/etc.) I want something that will be serviceable and not obsolete down the road should a replacement spring, etc. be needed. Thanks ......... Also, since I am new to this forum, is there a specific place for classifieds? I dont see a link.