The thing with frames is that there is quite a high production cost, so a lot of UK stores cant make a decent markup from them once import fees, VAT and shipping is added. Element paintball does a frame,good frame, though sometimes the cuts can be too big, eg the board might not be a snug fit in the frame so some modding is required. The trinity frame is ok, half the stock frame half element frame, NDZ is good, not as light as the element but still amazin. Then there is the SITH frame, pretty standard frame, is bigger than the stock frame in length, not my cup of tea. There is also the ANS frame but thats just ugly. The last frame i know about is the punishers frame, heavy as it has a load of milling on, comes in loads of different styles and designs, those are made by smartparts so they have the same feel and fittings. Warped got some sith frames in a while back i think, but all the others you will have to import, i would say for a hassle free install go with the NDZ.