You most certainly can have a 22 round mag!! I'll send you pics if you want to see. All OPEN grade shooters in UK, using both Remy and Benellis have at least 15 round mags. The only support they need is the standard mag bracket that comes with the gun....although I do put an extra one on for the longer tube. Yes it does look stupid and you do need to go to the gym, but it works well (worked well......before I got it wet in Bali.......I've just ordered a sure-cycle system too so fingers crossed!!). Tubes taking the gun to over 6Ft is the norm in Italy. The Thais have gone for shorter, sprung loaded replacement tubes but these are still in prototype stage....and were used at the Australasian Championships in Bali.