LCD's have heaps of aftermarket bits
Best sources without going abroad is LiPS and the infamous Tom Allen..
Planet used to have a few bits - try giving them a call - otherwise WDP did do things like Chain gripframes and triggers for the LCD - whether they still stock these is another question - afterall they havent made your gun in like 3 nearly 4 years apart from a limited number of special editions.
give Simon @ WDP call on 0121 328 2228, say Scars recomended him